Dr Anne Delextrat
Senior Lecturer in Sport and Exercise Science
School of Sport, Nutrition and Allied Health Professions
Role
As a Senior Lecturer and Subject Coordinator for the BSc in Sport, Physical Activity and Health Promotion. I teach several modules at undergraduate and postgraduate level and I am also subject coordinator. I am also a postgraduate Research tutor for the School of Sport, Nutrition and Allied Health Professions.
Areas of expertise
- Injury prevention
- Exercise physiology and biomechanics
- Anatomy
- Research methods
Teaching and supervision
Courses
- Applied Human Nutrition (MSc, PGDip, PGCert)
- Applied Sport and Exercise Nutrition (MSc, PGDip, PGCert)
- Sport and Exercise Science (BSc (Hons))
Modules taught
I am the Module Leader of multiple modules including:
- Anatomy for Sport and Exercise
- Research Methods
- Sports Injuries
- BSc in Sport, Physical Activity and Health Promotion
- MSc in Dietetics.
I also contribute in several undergraduate and postgraduate modules.
Supervision
I am supervising several BSc and MSc students every year on projects linked to the benefits of sports supplements on physical performance, effects of training programmes on lower limb injury risk factors, benefits of Zumba on physical fitness, and benefits of physical exercise in menopausal women.
I am also currently supervising several PhD students, including:
- Clare Shaw: Investigation into indicators of low energy availability risk utilising subjective and objective measures to establish effectiveness in detection and education need in athletes and exercising individuals.
- Niall Ashworth: Neural and neuromuscular movement control in Anterior Cruciate Ligament deficient individuals.
- Flick Lucas: Genetic Predisposition and Clinical Risk Factors on Bone and Musculoskeletal injuries in Female Competitive Contact Sports
- Joe Prosser: Trickle Down Holism: A critical realist, grounded theory enquiry into a Female Football Talent Development Environment.
- Bonnie Corrie-Lunn: Antisemitism in British Football: Examining Good Practice in Anti-Discrimination Educational Initiatives.
Research
My research focuses on three different aspects: I am interested in training interventions in the prevention of hamstrings and anterior cruciate ligament injuries. My other research interests revolved around exercise in clinical populations, in particular the potential benefits of Zumba Gold in people with Parkinson's, and physical training in children with motor impairment. Finally, my third research focus is on benefits of physical exercise in menopausal women, in particular in the workplace.
Centres and institutes
- Oxford Institute of Applied Health Research
- Centre for Movement, Occupational and Rehabilitation Sciences (MOReS)
Groups
Publications
Journal articles
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Weedon BD, Esser P, Collett J, Izadi H, Joshi S, Meaney A, Delextrat A, Kemp S, Dawes J, 'The Relationship Between Motor Competence Physical Activity Cardiorespiratory Fitness and BMI in UK Adolescents'
Research Quarterly for Exercise and Sport 95 (2) (2023) pp.482-488
ISSN: 0270-1367 eISSN: 2168-3824AbstractPublished here Open Access on RADARPurpose: This study set out to identify the extent of the relationships between subsections of the Movement Assessment Battery for Children 2nd Edition - MABC2 (manual dexterity, aiming and catching, and balance) to PA, CRF and BMI in adolescents.
Methods: Height, BMI, the MABC2, a 20m shuttle run test and wrist-worn accelerometery PA levels (mins) were measured. Multivariable linear regression models, adjusting for sex, height and BMI were used to assess the relationship of the three subsections of the MABC2 with PA, CRF and BMI.
Results: A total of 155 adolescents, aged 13-14 years, took part in this study (77 girls, 78 boys). Balance reported significant relationships with moderate to vigorous PA (unstandardised Beta B=0.15, 95%CI 0.02-0.28), vigorous PA (B=0.06, 95%CI 0.02-0.09) and BMI (B=-0.01, 95%CI -0.02-0.005). Balance in addition to aiming and catching skills were both significantly related to adolescent CRF (B=0.30, 95%CI 0.17-0.42 and B=0.29, 95%CI 0.14-0.45, respectively).
Conclusion: This study suggests that balance is the strongest correlate skill to achieving the highest intensities of PA and healthier BMI status in adolescents.
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Lee OT, Williams MA, Shaw CD, Delextrat A, 'The Role of Strength-Related Factors on Psychological Readiness for Return to Sport Following Anterior Cruciate Ligament (ACL) Reconstruction'
Healthcare 11 (20) (2023)
eISSN: 2227-9032AbstractPublished here Open Access on RADARPsychological readiness following anterior cruciate ligament reconstruction (ACLR) correlates with different return to sport outcomes. However, the relationship between strength and power and psychological readiness remains unexplored. The aim of this study was to investigate the relationship between anterior cruciate ligament return to sport after injury (ACL-RSI) scores and various hamstrings and quadriceps strength and power variables. Twelve participants (20.7 ± 2.5 years old; 174.2 ± 7.5 cm; 70.2 ± 8.5 kg; 18.2 ± 8.3% of body fat) who had an ACLR nine months or more before the study completed the ACL-RSI questionnaire and isokinetic strength testing of the hamstrings and quadriceps (60°·s−1 and 180°·s−1). Based on ACL-RSI scores, they were divided into “cases” and “controls”, deemed not psychologically ready and psychologically ready to return to previous sport performance (PILOS), respectively. The main findings are that quadriceps’ and hamstrings’ rate of torque development (RTD) and time since surgery were determinants of psychological readiness following ACLR. Furthermore, compared to controls, cases showed significantly lower quadriceps torque at angles close to full knee extension (40 deg and 30 deg from extension). They also showed lower RTD than controls, but no difference in peak torque. These results suggest that physiotherapists should facilitate athletes’ return to sport (RTS) by focusing on the restoration of RTD and strength at angles close to full knee extension.
Keywords: angle-specific torque; rate of force development; time since surgery; rehabilitation
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Emad Al-Yahya1,2*, Patrick Esser3, Benjamin D. Weedon3, Shawn Joshi3,4,5, Yan-Ci Liu3,6, Daniella N. Springett3,7, Piergiorgio Salvan8, Andy Meaney3, Johnny Collett3, Mario Inacio3,9, Anne Delextrat3, Steve Kemp3, Tomas Ward10, Hooshang Izadi11, Heidi Johansen-Berg8, Hasan Ayaz4,12, Helen Dawes3,13, 'Motor learning in developmental coordination disorder: behavioral and neuroimaging study'
Frontiers in Neuroscience 17 (2023)
ISSN: 1662-4548 eISSN: 1662-453XAbstractPublished here Open Access on RADARDevelopmental coordination disorder (DCD) is characterized by motor learning deficits that are poorly understood within whole-body activities context. Here we present results of one of the largest nonrandomized interventional trials combining brain imaging and motion capture techniques to examine motor skill acquisition and its underpinning mechanisms in adolescents with and without DCD. A total of 86 adolescents with low fitness levels (including 48 with DCD) were trained on a novel stepping task for a duration of 7 weeks. Motor performance during the stepping task was assessed under single and dual-task conditions. Concurrent cortical activation in the prefrontal cortex (PFC) was measured using functional near-infrared spectroscopy (fNIRS). Additionally, structural and functional magnetic resonance imaging (MRI) was conducted during a similar stepping task at the beginning of the trial.
The results indicate that adolescents with DCD performed similarly to their peers with lower levels of fitness in the novel stepping task and demonstrated the ability to learn and improve motor performance. Both groups showed significant improvements in both tasks and under single- and dual-task conditions at post-intervention and follow-up compared to baseline. While both groups initially made more errors in the Stroop task under dual-task conditions, at follow-up, a significant difference between single- and dual-task conditions was observed only in the DCD group. Notably, differences in prefrontal activation patterns between the groups emerged at different time points and task conditions. Adolescents with DCD exhibited distinct prefrontal activation responses during the learning and performance of a motor task, particularly when complexity was increased by concurrent cognitive tasks. Furthermore, a relationship was observed between MRI brain structure and function measures and initial performance in the novel stepping task. Overall, these findings suggest that strategies that address task and environmental complexities, while simultaneously enhancing brain activity through a range of tasks, offer opportunities to increase the participation of adolescents with low fitness in physical activity and sports.
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Walsh GS, Delextrat A, Bibbey A, 'The comparative effect of exercise interventions on balance in perimenopausal and early postmenopausal women: A systematic review and network meta-analysis of randomised, controlled trials'
Maturitas: An international journal of midlife health and beyond 175 (2023)
ISSN: 0378-5122 eISSN: 1873-4111AbstractPublished here Open Access on RADARIn addition to a range of physiological and psychological symptoms, menopause causes a decrement to balance performance and risk of falls. This review aimed to determine the effects of exercise interventions on balance in perimenopausal and early postmenopausal women. Web of Science, PubMed, CINAHL, SPORTDiscus and Cochrane Central Register of Controlled Trials databases were searched. Randomised, controlled trials of exercise interventions in perimenopausal or early postmenopausal populations with an average age of 65 years or younger reporting balance measures were included. Risk of bias was assessed using Cochrane RoB 2. A random effects model network meta-analysis was performed to assess the effect of exercise on balance. Standardised mean differences with 95 % confidence intervals were used as the measure of effect. Twenty-six studies were included after screening. Network meta-analyses were conducted for 5 balance variables. Whole-body vibration (standardised mean difference: 2.25, confidence interval: 0.08; 4.43), balance (standardised mean difference: 1.84, confidence interval: 0.15; 3.53), balance + nutrition (standardised mean difference: 3.81, confidence interval: 1.57; 6.05) and resistance (standardised mean difference: 1.43, confidence interval: 0.41; 2.46) exercise improved Berg balance scale performance. Resistance + aerobic + balance exercise improved one-leg stance (standardised mean difference: 0.80, confidence interval: 0.39; 1.22) and whole-body vibration improved anterior-posterior (standardised mean difference: −0.89, confidence interval: −1.48; −0.31), medio-lateral (standardised mean difference: −0.58, confidence interval: −1.15; −0.01) postural sway and falls indices (standardised mean difference: −0.75, confidence interval: −1.45; −0.04). Exercise improved all balance measures and should be considered as an adjunct therapy in perimenopausal and postmenopausal women. Whole-body vibration was most frequently the highest ranked intervention; resistance and balance training also improved balance.
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Inacio M, Esser P, Weedon BD, Joshi S, Meaney A, Delextrat A, Springett D, Kemp S, Ward T, Izadi H, Johansen-Berg H, Dawes H, 'Learning a novel rhythmic stepping task in children with probable Developmental Coordination Disorder '
Clinical Biomechanics 102 (2023)
ISSN: 0268-0033 eISSN: 1879-1271AbstractPublished here Open Access on RADARBackground: Developmental coordination disorder affects approximately 6% of children, interfering with participation in physical activity and can persist through adulthood. However, no studies have investigated the neuromotor mechanisms of learning of a novel task with rhythmic cueing.
Methods: Movement Assessment Battery for Children-2nd edition was used to identify 48 children with probable developmental coordination disorder (13.9±0.05 yrs, 27% male) and 37 typically developed (13.9±0.10 yrs, 54% male). While instrumented with an inertial measurement unit, both groups performed a novel rhythmic stepping task and with a concurrent auditory stroop test (dual-task), underwent seven weeks of intervention with step training with rhythmic cuing and were tested for retention five weeks post-intervention.
Findings: Initially, the group with probable developmental coordination disorder had a higher variability of step timing (coefficient of variation: 0.08±0.003-typically developed – 0.09±0.004-probable developmental coordination disorder, ppppppp
Interpretation: Rhythmic cueing shows strong promise for enhancing motor learning in children with probable developmental coordination disorder.
Trial registration: Retrospectively registered on ClinicalTrials.gov with reference: NCT03150784
Keywords: Developmental Coordination Disorder, stepping, motor learning, intervention, rhythmic cueing.
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Sancese A, Taylor L, Walsh G, Byrd E, Delextrat A, 'Effects of sprint versus strength training on risk factors for hamstring injury in football players'
The Journal of Sports Medicine and Physical Fitness 63 (4) (2023)
ISSN: 0022-4707 eISSN: 1827-1928AbstractPublished hereBACKGROUND: This study aimed to compare the effects of in-season sprint training vs. Nordic hamstring exercise (NHE) training on risk factors for hamstring strain injuries (HSI).
METHODS: Eighteen male university football players (20.9±2.5 years; 181±7 cm; 75.8±9.1 kg; 15.2±3.5% of body fat) were randomly allocated to a sprint group or NHE group. They completed baseline isokinetic strength and sprint mechanics assessments prior to their assigned intervention performed twice weekly for 4-weeks, before post-testing. A mixed design ANOVA with repeated measures assessed time, group and interaction effects for all risk factors.
RESULTS: There were significant increases in hamstring eccentric peak torque at 60°·s-1 (+8% - 9.9%), the torque produced at 20° (+15%) and 10° (+21% - 31%), as well as a rightward shift in angle of peak torque towards knee extension (-27% - -36%) in both groups (P-1 in the strength group only and significant improvements (+29.4%) in the rate of torque development of the dominant leg at 60°·s-1 in the sprint group only (P0.05).
CONCLUSIONS: These findings suggest that both training programs can be effective to mitigate the risk of HSI, but through different mechanisms. -
Weedon BD, Liu F, Mahmoud W, Burden SJ, Whaymand L, Esser P, Collett J, Izadi H, Joshi S, Meaney A, Delextrat A, Kemp S, Jones A, Dawes H, 'Declining fitness and physical education lessons in UK adolescents'
BMJ Open Sport & Exercise Medicine 8 (2022)
ISSN: 2055-7647 eISSN: 2055-7647AbstractPublished here Open Access on RADARObjectives The objective was to determine recent cross-sectional trends in health-related fitness (HRF) in secondary school students by studying the 13–14 years old age group repeatedly over 6 years, considering parallel national trends in physical education (PE).
Methods Height, weight, broad jump, grip strength, 20 m shuttle run and throwing and catching skills were measured by the same research team using standardised techniques from 2014 to 2019. Trends in these HRF measures were assessed by linear regression, adjusting for school, sex and height. Interactions with fitness and body mass index (BMI) were tested. The number of PE lessons reported in the UK Annual School Workforce Census between 2010 and 2019 for all state-funded secondary schools was analysed.
Results Grip strength (B=−0.60, 95% CI −0.78 to –0.41), broad jump (B=−1.16, 95% CI −1.99 to –0.34), 20 m shuttle run (B=−1.85, 95% CI −2.58 to –1.12) and throwing and catching skills (B=−0.12, 95% CI −0.15 to –0.08) declined significantly over the study period. There was a greater reduction in broad jump and grip strength in adolescents with low fitness and a greater reduction in fitness and motor competence in adolescents with normal BMI. These declines coincided with a 16% reduction nationally in secondary school PE between 2010 (333 800 hours) and 2019 (280 725 hours).
Conclusion Adolescent HRF has declined in recent years, in parallel with PE lessons. Declines were observed across all young people and particularly those of low fitness and normal BMI. To reach the majority of young people, policy makers could increase PE in schools to increase activity and prevent worsening fitness and health in future generations.
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Beale N, Eldridge E, Delextrat A, Esser P, Bushnell O, Curtis E, Wassenaar T, Wheatley C, Johansen-Berg H, Dawes H, 'Exploring activity levels in physical education lessons in the UK: a cross-sectional examination of activity types and fitness levels'
BMJ Open Sport & Exercise Medicine 7 (1) (2021)
ISSN: 2055-7647 eISSN: 2055-7647AbstractPublished here Open Access on RADARObjectives. To establish pupil fitness levels, and the relationship to global norms and physical education (PE) enjoyment. To measure and describe physical activity (PA) levels during secondary school PE lessons, in the context of recommended levels, and how levels vary with activity and lesson type.
Methods. A cross-sectional design; 10 697 pupils aged 12.5 (SD 0.30) years; pupils who completed a multistage fitness test and wore accelerometers to measure PA during PE lessons. Multilevel models estimated fitness and PE activity levels, accounting for school and class-level clustering.
Results. Cardiorespiratory fitness was higher in boys than girls (ß=−0.48; 95% CI −0.56 to −0.39, p
Conclusions. PE lessons were inactive compared with current guidelines. We propose that if we are to continue to develop a range of sporting skills in schools at the same time as increasing levels of fitness and PA, there is a need to introduce additional sessions of PE activity focused on increasing physical activity.
Trial registration number NCT03286725.
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Brini S, Delextrat A, Bouassida A, 'Variation in lower limb power and three point shot performance following repeated sprints: one vs. five changes of direction in male basketball players'
Journal of Human Kinetics 77 (1) (2021) pp.169-179
ISSN: 1899-7562 eISSN: 1899-7562AbstractPublished here Open Access on RADARRepeated sprint ability (RSA) with five changes of direction was well admitted to replicate real basketball game situations, but the additional changes of direction may affect some fundamental skills and performances in basketball. The aim of this study was to investigate the effects of RSA with one vs. five changes of direction (IRSA5COD) on squat jump (SJ), five jump test (FJT) and three point shot (3PS) performances in male basketball players. Sixteen participants (23.4 ± 2.3 years; 1.86 ± 0.10 m; 77.8 ± 7.7 kg) randomly performed eight testing sessions consisting of either RSA (10 repetitions of (15 m + 15 m)) or IRSA5COD (10 repetitions of (5 m + 5 m + 5 m + 5 m + 5 m + 5 m)) performed alone or immediately followed by the SJ, FJT or 3PS. The heart rate (HR) and ratings of perceived exertion (RPE) were continuously recorded, while blood lactate concentration was measured post-tests. Differences between RSA and IRSA5COD were evaluated by a Student t-test for paired samples, while analyses of variance (ANOVAs) with repeated measures assessed differences in SJ, FJT and 3PS performance between baseline, post-RSA and post-IRSA5COD. A significantly poorer FJT performance post-RSA was shown compared to baseline (7.47 ± 0.47 vs.7.54 ± 0.47 m, p = 0.01) and post-IRSA5COD (7.47 ± 0.47 vs. 7.56 ± 0.49%, p = 0.048). Significantly lower 3PS accuracy was also observed post-IRSA5COD compared to baseline (41.3 ± 3.1 vs.53.1 ± 2.8%, p = 0.003) and post-RSA (41.3 ± 3.1 vs. 48.1 ± 3.7%, p = 0.033). These results suggest that jump performance required for crucial actions such as lay-ups is negatively affected by longer sprints (15-m) with few changes of direction, while 3PS accuracy is impaired by shorter sprints with many changes of direction. These situations should be replicated when training these particular abilities to optimize training adaptations.
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Eda Cinar1, Benajmin David Weedon2, Patrick Esser2, Shawn Joshi3, Yan-Ci Liu4, Anne
Delextrat2, Andy Meaney2 , Johnny Collett2, Daniella Nicole Springett2, Helen Dawes2,5,6, 'Dual-task effect on gait in healthy adolescents: Association between health-related indicators and DT performance'
Journal of Motor Behavior 53 (6) (2021) pp.707-716
ISSN: 0022-2895 eISSN: 1940-1027AbstractPublished here Open Access on RADARThe purpose of this study was to determine how dual-task (DT) effect on gait differs among adolescents with different fitness and health profiles. The gait performances of 365 adolescents aged 13-14 years were assessed at single and DT walking. The proportional changes in gait parameters from single to dual were regressed against gender, body mass index (BMIz), three components of MABC-2 (balance, aiming &catching and manual dexterity), group (high vs low motor competence), body strength, physical fitness level using multiple regression analyses; and gender and four items of balance subtest of MABC-2 in the secondary analysis. The analyses showed that being female was associated with greater reduction in gait speed and stride length and an increase in double support time and step time; and having lower score in balance was related to greater reduction in gait speed, and cadence, and an increase in step time. Only zig-zag hopping item of the balance subtest was associated with DT effect on gait speed and stride length. No significant relationships were found between DT effect on gait and the rest of the predictors. Females and adolescents with lower level of balance function may be at higher risk of having DT deficit during walking.
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Delextrat A, Esser P, Beale N, Bozon F, Eldridge E, Izadi H, Johansen-Berg H, Wheatley C, Dawes H, 'Effects of gender, activity type, class location and class composition on physical activity levels experienced during physical education classes in British secondary schools: a pilot cross-sectional study'
BMC Public Health 20 (2021)
ISSN: 1471-2458 eISSN: 1471-2458AbstractPublished here Open Access on RADARBackground. Pupils in secondary schools do not meet the targets for physical activity levels during physical education (PE) sessions, and there is a lack of data on the vigorous physical activity domain (VPA) in PE known to be positively associated with cardio metabolic health While PE session intensity depends on a variety of factors, the large majority of studies investigating these factors have not taken into account the nested structure of this type of data set. Therefore, the aim of this study was to investigate the relationship between various factors (gender, activity type, class location and class composition) and various activity levels during PE classes in secondary schools, using a multi-level statistical approach.
Methods. Year eight (12–13 years old) adolescents (201 boys and 106 girls) from six schools were fitted with accelerometers during one PE session each, to determine the percentage (%) of the PE session time spent in sedentary (SPA), light (LPA), moderate (MPA), vigorous (VPA) and moderate-to-vigorous (MVPA) intensity levels. Two- and three-level (pupils, n = 307; classes, n = 13, schools, n = 6) mixed-effect models were used to assess the relationship between accelerometer-measured physical activity levels (% of class time spent in various activity levels) and gender, activity type, class location and composition.
Results. Participants engaged in MVPA and VPA for 30.7 ± 1.2% and 11.5 ± 0.8% of PE classes, respectively. Overall, no significant association between gender or class composition and PA was shown. A significant relationship between activity type and PA was observed, with Artistic classes significantly less active than Fitness classes for VPA (5.4 ± 4.5 vs. 12.5 ± 7.1%, p = 0.043, d:1.19). We also found a significant association between class location and PA, with significantly less time spent in SPA (24.8 ± 4.8% vs. 30.0 ± 3.4%, p = 0.042, d:0.77) and significantly more time spent in VPA (12.4 ± 3.7% vs. 7.6 ± 2.0%, p = 0.022, d:1.93) and MVPA (32.3 ± 6.7% vs.24.8 ± 3.8%, p = 0.024, d:1.33) in outdoors vs. indoors classes.
Conclusions. The results suggest that class location and activity type could be associated with the intensity of PA in PE. It is essential to take into account the clustered nature of this type of data in similar studies if the sample size allows it.
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Jemni M, Marina M, Delextrat A, Tanner A, Basset FA, Gu Y, Hu Q, Zhou H, Mkaouer B, Konukman F, 'Salivary endocrine response following a maximal incremental cycling protocol with local vibration'
PLoS ONE 15 (9) (2021)
ISSN: 1932-6203AbstractPublished here Open Access on RADARThe aim of this study was to compare the effects of vibration (Vib versus noVib) during a maximal graded cycling exercise on hormonal response, precisely on cortisol (C) and testosterone (T). Twelve active males (25 ± 5yrs; 181 ± 5cm; 80.7 ± 11.1kg) randomly performed two maximal incremental cycling tests on two separate days and at the same time of the day (09:00). The protocol consisted of incremental steps of 3 min duration performed on a PowerBIKETM that induces vibration cycling. The study was a repeated measures design and participants performed the test with and without vibration. Gas exchange and heart rate (HR) were continuously assessed and blood lactate (Bla) was recorded at the end of each incremental stage. Saliva samples were collected before and immediately after the test, and analysed for (C) and (T).
The results show that C and T increased in both cycling conditions; however, the C’s magnitude of change was significantly higher by 83% after Vib cycling in comparison to the no Vib (p = 0.014), whereas the T’s magnitude of change were not statistically different between trials (p = 0.715). Vibration induced a decrease of the T/C ratio (p = 0.046) but no significant changes were observed following noVib (p = 0.476). As a conclusion, the investigation suggests that adding mechanical vibration to cycling may potentiate a catabolic exercise-induced state, which could have potential clinical implications in rehabilitation and injury treatment. Sport experts should take this message home to carefully plan the recovery process and time during training and competitions.
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Cinar E, Weedon B, Esser P, Joshi S, Liu Y, Delextrat A, Collett J, Springett D, Dawes H, 'Dual-task effect on gait in adolescents: How does it change in different health profile?'
Gait & Posture 81 (Suppl 1) (2020)
ISSN: 0966-6362 eISSN: 1879-2219Published here -
Mansoubi M, Weedon BD, Esser P, Mayo N, Fazel M, Wade W, Ward TE, Kemp S, Delextrat A ,Dawes H, 'Cognitive performance, quality and quantity of movement reflect unhealthy psychological symptoms in adolescents'
Journal of Sports Science and Medicine 19 (2) (2020) pp.364-373
ISSN: 1303-2968AbstractPublished here Open Access on RADARPurpose: The presentation of unhealthy psychological symptoms are rising sharply in adolescents. Detrimental lifestyle behaviours are proposed as both possible causes and consequences. This study set out to compare selected measures of quality and quantity of movement between adolescents with and without unhealthy psychological symptoms.
Methods: Using a cross sectional design, 96 participants completed the study from a whole year group of 166, age (13.36 ± 0.48) male 50.6% from a secondary school in Oxfordshire, England as a part of a larger study (EPIC) between January and April 2017. Measures were taken of quality and quantity of movement: reaction/movement time, gait pattern & physical activity, alongside psychological symptoms. Differences in movement behaviour in relation to psychological symptom and emotional problem presentation were determined using ANOVA. In the event of a significant result for the main factor of each parameter, a Bonferroni -corrected post hoc test was conducted to show the difference between categories in each group. Results for both unhealthy psychological symptoms and emotional problems were grouped into four categories (‘Close to average’, ‘slightly raised’, ‘high’ and ‘very high’).
Results: Early adolescents with very high unhealthy psychological symptoms had 16.79% slower reaction times (p = .003, ηp2 = .170), 13.43% smaller walk ratio (p = .007, ηp2 = .152), 7.13% faster cadence (p = .005, ηp2 = .149), 6.95% less step time (p = .007, ηp2 = .153) and 1.4% less vigorous physical activity (p = .04, ηp2 = .102) than children with close to average psychological symptoms. Early adolescents with very high emotional problems had 12.25% slower reaction times (p = .05, ηp2 = .081), 10.61% smaller walk ratio (p = .02, ηp2 = .108), 6.03% faster cadence (p = .01, ηp2 = .134), 6.07% shorter step time (p = .007, ηp2 = .141) and 1.78% less vigorous physical activity (p = .009, ηp2 = .136) than children with close to average emotional problems.
Conclusions: Different movement quality and quantity of was present in adolescents with unhealthy psychological symptoms and emotional problems. We propose movement may be used to both monitor symptoms, and as a novel therapeutic behavioural approach. Further studies are required to confirm our findings. -
Mahmoud W, Delextrat A, Esser P, Dawes H, 'School-based Screening Tool for Adolescents with Low Motor Coordination Abilities'
Perceptual and Motor Skills 126 (5) (2019) pp.779-796
ISSN: 0031-5125 eISSN: 1558-688XAbstractPublished here Open Access on RADARThis study sought to select the most relevant test items from the Bruininks-Oseretsky Test of Motor Proficiency, Second Edition (BOTMP-2) and from a selection of health-related fitness tests for identifying school teenagers with poor motor coordination. The 241 participants in this study (144 boys, 97 girls aged 13–14 years old) were tested on the short form of the BOTMP-2 and on the following additional fitness tests: (a) seated medicine ball test, (b) broad jump, (c) handgrip strength, (d) alternate hand ball wall toss, (e) 10 × 5-meter agility shuttle run, and (f) Chester step test. We performed a factor analysis of participant scores on these various tasks and BOTMP-2 test items to reduce them to the least number of meaningful and useful items. Four factors explained 45% of the data variance: gross motor skills and power (including broad jump, hand ball toss, shuttle run, and sit-ups tests); fine motor skills (including copying star, following the maze and paper folding); core strength and balance (including push-ups, hopping, and balance beam); and general body strength (including medicine ball throw and handgrip). We conclude that an efficient school-based battery of test items to screen 13-14 year old adolescents for fitness and coordination should assess these four factors and might especially rely upon the broad jump, copying a star shape, hopping handgrip strength, aerobic fitness, and wall ball toss.
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Delextrat, A. MacKessy, S., Arceo-Rendon, Scanlan, A., Ramsbottom, R. and Calleja-Gonzalez, J., 'Effects of Three-Day Serial Sodium Bicarbonate Loading on Performance and Physiological Parameters During a Simulated Basketball Test in Female University Players'
International Journal of Sport Nutrition and Exercise Metabolism 28 (5) (2018) pp.547-552
ISSN: 1526-484X eISSN: 1543-2742AbstractThe aim of this study was to investigate the effect of 3-day serial sodium bicarbonate ingestion on repeated sprint and jump performance. Fifteen female university basketball players (23.3 ± 3.4 years; 173.1 ± 5.8 cm; 65.8 ± 6.3 kg; 23.6 ± 4.9% body fat) ingested 0.4 g/kg body mass of sodium bicarbonate or placebo for 3 days (split in three equal daily doses), before completing a simulated basketball exercise. Sprint and circuit times, jump heights, performance decrements, and gastrointestinal side effects were recorded during the test, and blood lactate concentration wasmeasured pre- and posttest. Sodiumbicarbonate supplementation led to significant decreases in mean sprint times (1.34 ± 0.23 vs. 1.70 ± 0.41 s, p = .008, 95% confidence intervals [−0.54, −0.10 s]) and mean circuit times (30.6 ± 2.0 vs. 31.3 ± 2.0 s, p = .044) and significantly greater mean jump height (26.8 [range 25.2–34.2] vs. 26.0 [range 25.6–33.6] cm, p = .013) compared with placebo. Performance decrement was significantly less for sprints with sodium bicarbonate compared with placebo (9.9 [range 3.4–37.0]% vs. 24.7 [range 4.1–61.3]%, p = .013), but not different for jumps (13.1 ± 4.5% vs. 12.5 ± 3.1%, p = .321) between conditions. No differences in gastrointestinal side effects were noted between conditions. Significantly greater postexercise blood lactate concentrations were measured in the sodium bicarbonate condition compared with the placebo condition (8.2 ± 2.8 vs. 6.6 ± 2.4 mmol/L, p = .010). This study is the first to show that serial loading of sodium bicarbonate is effective for basketball players to improve repeated sprint and jump performance during competition, or withstand greater training load during practice sessions without any gastrointestinal side effects.Published here Open Access on RADAR -
Weedon B, Liu F, Mahmoud W, Metz R, Beunder K, Delextrat A, Morris M, Esser P, Collett J, Meaney A, Howells K, Dawes H, 'The relationship of gross upper and lower limb motor competence to measures of health and fitness in adolescents aged 13-14 years'
BMJ Open Sport & Exercise Medicine 4 (1) (2018)
ISSN: 2055-7647 eISSN: 2055-7647AbstractIntroduction: Motor competence (MC) is an important factor in the development of health and fitness in adolescence. Aims: This cross-sectional study aims to explore the distribution of MC across 13-14 year old school students and the extent of the relationship of MC to measures of health and fitness across genders. Methods: A total of 718 participants were tested from three different schools in the UK, 311 girls, and 407 boys (aged 13-14 years), pairwise deletion for correlation variables reduced this to 555 (245 girls, 310 boys). Assessments consisted of, body mass index, aerobic capacity, anaerobic power, upper limb and lower limb MC. The distribution of MC and the strength of the relationships between MC and health/fitness measures were explored.Published here Open Access on RADAR
Results: Girls performed lower for MC and health/fitness measures compared to boys. Both measures of MC showed a normal distribution and a significant linear relationship of MC to all health and fitness measures for boys, girls, and combined genders. A stronger relationship was reported for upper limb MC and aerobic capacity when compared to lower limb MC and aerobic capacity in boys (t= -2.21, df= 307, p = 0.03, 95%CI -0.253 -0.011). Conclusion: Normally distributed measures of upper and lower limb MC are linearly related to health and fitness measures in adolescents in a UK sample.
Trial Registration: NCT02517333 -
Clemente FM, González-Víllora S, Delextrat A, Martins FML, Pastor Vicedo JC, 'Effects of the Sports Level, Format of the Game and Task Condition on Heart Rate Responses, Technical and Tactical Performance of Youth Basketball Players'
Journal of Human Kinetics 58 (1) (2017) pp.141-155
ISSN: 1899-7562 eISSN: 1899-7562AbstractThe aim of this study was to analyze the effect of different small-sided and conditioning games (SSCG) with different tactical contents on heart rate responses, technical performance and collective organization of youth basketball players of different performance levels. Twenty male basketball players from U14 (13.7 ± 0.8 years old; 4.2 ± 1.4 years of practice) and U16 (15.3 ± 1.1 years old; 6.4 ± 2.1 years of practice) participated in this research study. The two-way MANOVA revealed that the sports level (p = 0.009; = 0.151), format (p = 0.001; = 0.246) and task condition (p = 0.023; = 0.104; small effect size) had significant main effects on heart rate responses. It was also found that the format (p = 0.001; = 0.182) had significant main effects on technical performance. A smaller format significantly increased the heart rate, volume of play, efficiency index and collective density during attacking plays. The SSCG with attacking content statistically increased the heart rate, efficiency index and performance score. Therefore, this study revealed that different SSCGs with tactical content influenced the physiological responses of youth players.Published here Open Access on RADAR -
Clarke ND, Thomas JR, Kagka M, Ramsbottom R, Delextrat A, 'No Dose-Response Effect of Carbohydrate Mouth Rinse Concentration on 5-km Running Performance in Recreational Athletes'
The Journal of Strength and Conditioning Research 31 (3) (2017) pp.715-720
ISSN: 1064-8011 eISSN: 1533-4287AbstractOral carbohydrate rinsing has been demonstrated to provide beneficial effects on exercise performance of durations of up to one hour, albeit predominately in a laboratory setting. The aim of the present study was to investigate the effects of different concentrations of carbohydrate solution mouth-rinse on 5 km running performance. Fifteen healthy men (n=9; mean±SD age: 42±10 years; height: 177.6±6.1 cm; body mass: 73.9±8.9 kg) and women (n=6; mean±SD age: 43±9 years; height: 166.5±4.1 cm; body mass: 65.7±6.8 kg) performed a 5 km running time trial on a track on four separate occasions. Immediately before starting the time trial and then after each 1 km, subjects rinsed 25 mL of either 0, 3, 6, or 12% maltodextrin for 10 s. Mouth-rinsing with 0, 3, 6 or 12% maltodextrin did not have a significant effect on the time to complete the time trial (0%: 26:34±4:07 min:sec; 3%: 27:17±4:33 min:sec; 6%: 27:05±3:52 min:sec; 12%: 26:47±4.31 min:sec; P=0.071;2 =0.15), heart rate (P=0.095; 2 =0.16), rating of perceived exertion (RPE) (P=0.195; P =0.11), blood glucose (P=0.920; P =0.01) and blood lactate concentration (P=0.831; 2 =0.02), with only non-significant trivial to small differences between concentrations. Results of this study suggest that carbohydrate mouth-rinsing provides no ergogenic advantage over that of an acaloric placebo (0%), and that there is no dose-response relationship between carbohydrate solution concentration and 5 km track running performance.Published here Open Access on RADAR -
Matthews MJ, Heron K, Todd S, Tomlison A, Jones P, Delextrat A, Cohen DD, 'Strength and endurance training reduces the loss of eccentric hamstring torque observed after soccer specific fatigue'
Physical Therapy in Sport 25 (2017) pp.39-46
ISSN: 1466-853XAbstractObjectivesPublished here Open Access on RADARTo investigate the effect of two hamstring training protocols on eccentric peak torque before and after soccer specific fatigue.
Participants
Twenty-two university male soccer players.
Design
Isokinetic strength tests were performed at 60°/s pre and post fatigue, before and after 2 different training interventions. A 45-min soccer specific fatigue modified BEAST protocol (M-BEAST) was used to induce fatigue. Players were randomly assigned to a 4 week hamstrings conditioning intervention with either a maximum strength (STR) or a muscle endurance (END) emphasis.
Main outcome measures
The following parameters were evaluated: Eccentric peak torque (EccPT), angle of peak torque (APT), and angle specific torques at knee joint angles of 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80° and 90°.
Results
There was a significant effect of the M-BEAST on the Eccentric torque angle profile before training as well as significant improvements in post-fatigue torque angle profile following the effects of both strength and muscle endurance interventions.
Conclusions
Forty-five minutes of simulated soccer activity leads to reduced eccentric hamstring torque at longer muscle lengths. Short-term conditioning programs (4-weeks) with either a maximum strength or a muscular endurance emphasis can equally reduce fatigue induced loss of strength over this time period.
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Delextrat A, Bateman J, Esser P, Targen N, Dawes H, 'The potential benefits of Zumba Gold® in people with mild-to-moderate Parkinson’s: feasibility and effects of dance style and number of sessions'
Complementary Therapies in Medicine 27 (2016) pp.68-73
ISSN: 0965-2299 eISSN: 1873-6963AbstractObjectivesPublished here Open Access on RADARTo assess the feasibility of Zumba Gold® in people with PD, and to investigate the effects of dance styles and number of sessions on activity levels and physiological load.
Design
Repeated measure uncontrolled (single group) feasibility study.
Setting
Eleven participants (age: 64.0 ± 8.1 years) with mild-to-moderate idiopathic PD (Hoehn & Yahr stage < 3.0) took part in a screening session, followed by six Zumba Gold® workouts each separated by one week, and a follow-up interview six months later.
Main outcome measures
The main feasibility parameters measured were retention, compliance, and adverse events. Furthermore, during each Zumba Gold® session, physical activity levels were measured using tri-axial accelerometers, while physiological load was assessed by average heart rate (HRmean). A two-way ANOVA with repeated measures assessed the effects of dance styles and session number on activity level and HR.
Results
73% retention and 81% compliance were achieved, and no adverse events were recorded. Participants’ enjoyment was high and 38% started Zumba Gold® classes in the community after intervention. HR values were similar between dance styles and within the American College of Sports Medicine (ACSM)’s recommendations in 50% of participants. Backwards steps reduced physiological load but improvements in activity levels between the first and last sessions show that steps could be learnt with time.
Conclusions
Zumba Gold® is safe and enjoyable for people with PD. The excellent compliance and positive participants’ feedback suggest the need for a larger-scale trial.
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Marqués-Jiménez D, Calleja-González J, Arratibel I, Delextrat A, Terrados N, 'Are compression garments effective for the recovery of exercise-induced muscle damage? A systematic review with meta-analysis'
Physiology & Behavior 153 (2016) pp.133-148
ISSN: 0031-9384AbstractPublished herePurpose: The aim was to identify benefits of compression garments used for recovery of exercised-induced muscle damage. Methods: Computer-based literature research was performed in September 2015 using four online databases: Medline (PubMed), Cochrane, WOS (Web Of Science) and Scopus. The analysis of risk of bias was completed in accordance with the Cochrane Collaboration Guidelines. Mean differences and 95% confidence intervals were calculated with Hedges' g for continuous outcomes. A random effect meta-analysis model was used. Systematic differences (heterogeneity) were assessed with I statistic. Results: Most results obtained had high heterogeneity, thus their interpretation should be careful. Our findings showed that creatine kinase (standard mean difference = - 0.02, 9 studies) was unaffected when using compression garments for recovery purposes. In contrast, blood lactate concentration was increased (standard mean difference = 0.98, 5 studies). Applying compression reduced lactate dehydrogenase (standard mean difference = - 0.52, 2 studies), muscle swelling (standard mean difference = - 0.73, 5 studies) and perceptual measurements (standard mean difference = - 0.43, 15 studies). Analyses of power (standard mean difference = 1.63, 5 studies) and strength (standard mean difference = 1.18, 8 studies) indicate faster recovery of muscle function after exercise. Conclusions: These results suggest that the application of compression clothing may aid in the recovery of exercise induced muscle damage, although the findings need corroboration.
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Delextrat A, Neupert E, 'Physiological load associated with a Zumba® fitness workout: a comparison pilot study between classes and a DVD'
Journal of Sports Sciences 34 (1) (2016) pp.47-55
ISSN: 0264-0414AbstractPublished hereThe objectives were to compare the metabolic load elicited by Zumba classes and DVD workouts and link the physiological responses to participants’ psychological characteristics. Fifteen women (25.4 ± 4.3 years old; 164.9 ± 5.1 cm; 56.9 ± 5.8 kg; 23.9 ± 4.9% body fat) performed three Zumba classes and three Zumba DVD workouts using a repeated measure design. Energy expenditure was assessed by extrapolating oxygen cost from heart rate (HR) using regressions from a preliminary incremental running test. Differences between Zumba classes and Zumba DVD workouts were assessed by Student’s T tests and repeated measures analysis of variance and correlations between physiological and psychological variables by the Pearson’s coefficient. Results showed that Zumba classes allowed greater energy expenditure compared to Zumba DVD workouts (6.8 ± 0.9 vs 5.6 ± 0.9 kcal · min, 95% confidence interval (CI) limits: 0.3–2.1, P = 0.016), with significant differences in the time spent with a HR above 85% of HR reserve (14.7 vs 1.7%, 95% CI: 5.6–20.4, P = 0.021). Furthermore, women with a greater autonomy score showed a smaller difference between DVD and class (r = 0.511, P = 0.048), while greater differences were shown in women with greater interpersonal skills (r = −0.563, P = 0.028). The results suggest that while both types of workouts are suitable to maintain fitness Zumba classes allow greater energy expenditure.
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Calleja-Gonzalez J, Mielgo-Ayuso J, Lekue JA, Leibar X, Erauzkin J, Jukic I, Ostojic SM, Delextrat A, Sampaio J, Terrados N, 'The Spanish "Century XXI" academy for developing elite level basketballers: design, monitoring and training methodologies'
The Physician and Sportsmedicine 44 (2) (2016) pp.148-157
ISSN: 0091-3847 eISSN: 2326-3660AbstractObjectives: The XXI Century Academy was a 6-year state-initiated intervention program that served as an alternative to basketball clubs for players in the u-14 and u-18 age groups in Spain, under guidelines established by the Spanish Basketball Federation. It was an important and unique project on talent development in basketball. To the best of the authors' knowledge, no evidence has been reported on long-term athlete development programs in basketball worldwide. The main aim of this report is to describe the design and evaluation methods used for the XXI Century Academy as a long-term intervention program in the elite Spanish Basketball Academy, aiming to prepare basketball players toPublished here
compete at the elite level.
Methods: The monitoring time lasted from 1996 to 2001. A total of 55 players were assigned to the intervention groups based on age, position, maturation level, and country of origin. During this process, participants competed in up to two categories in addition
to playing competitive official matches worldwide in international tournaments in their categories and with the national team in the European and World Championships (u-14 - u-18). Participants included 1 NBA player, 3 national A Team players, 10 ACB (First Spanish League) players, 5 LEB (second League) players and 39 LEB-2 EBA (third League) players. Assessments took place in a High-Performance Sports Center (CPT
FADURA-GETXO- Basque Government, Getxo, Vizcaya, Spain) and consisted of health questionnaires, anthropometric measures, blood parameters, maturation level, birth age, fitness tests, training volume and intensity, physical activity, technical and tactical training, dietary intake, supplementation and injuries. Each player was assessed 4 times per year (September, December, April, June) for 4years (16 data points).
Results: This is a purely methodological paper describing the design and evaluation methods used in the XXI Century Project, which will be used as a basis for future reporting of results. Therefore, the results of the project will be reported in subsequent publications.
Conclusion: The viability of the Century XXI Project protocols has been described. This national project of training in basketball closely replicates the physical and technical match-play conditions for professionals and may constitute a useful training tool. -
Delextrat A, Grosgeorge B, Bieuzen F, 'Determinants of performance in a new test of planned agility for young elite basketball players'
International Journal of Sports Physiology and Performance 10 (2) (2015) pp.160-165
ISSN: 1555-0265 eISSN: 1555-0273AbstractPublished herePurpose: To investigate the reliability and determinants of performance in a new test of planned agility in elite junior basketball players. Methods: Seventeen female (15.1 ± 0.4 y, 176.9 ± 11.2 cm, 65.7 ± 10.9 kg) and 42 male (14.9 ± 0.4 y, 193.7 ± 8.1 cm, 79.0 ± 12.0 kg) elite junior basketball players performed 5 fitness tests presented in a random order, including a 20-m sprint, a planned-agility test, a triple bilateral horizontal countermovement jump, and 2 triple unilateral horizontal countermovement jumps (with each leg separately). The novelty of the planned-agility test is that it included both offensive and defensive movements. The determinants of planned agility were assessed by a stepwise-regression analysis, and the reliability of the new test was evaluated by the intraclass correlation coefficient and the typical error of measurement. Results: The main results show good reliability of the new test of planned agility. In addition, the determinants of planned-agility performance were different between genders, with sprint performance explaining 74.8% of the variance for girls, while unilateral jump performance and body mass were the most important for boys, accounting for 24.0% and 8.9% of the variance, respectively, in planned agility. Conclusions: These results highlight a gender effect on the determinants of planned-agility performance in young elite basketball players and suggest that straight-line sprint and unilateral horizontal tests must be implemented to test elite junior players.
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Delextrat AA, Warner S, Graham S, Neupert E, 'An 8-Week Exercise Intervention Based on Zumba Improves Aerobic Fitness and Psychological Well-Being in Healthy Women'
Journal of Physical Activity and Health 13 (2) (2015) pp.131-139
ISSN: 1543-3080 eISSN: 1543-5474AbstractBackground: Although Zumba is practiced by millions of people worldwide, there is a paucity of research about its potential benefits. The objective of this study was to investigate the effects of Zumba on physiological and psychological outcomes in healthy women.Published here Open Access on RADAR
Methods: Cardiovascular fitness, body composition, physical self-perception and
psychological well-being were assessed before and immediately after 8 weeks of Zumba performed 3 times weekly (Zumba group, n = 22, age: 26.6 +/- 5.4 years old; height: 165.8 +/- 7.1 cm) or no intervention (control group, n = 22, age: 27.9 +/- 6.0 years old; height: 164.7 +/- 6.2 cm). All variables were analyzed by a 2-way (Group x Time) analysis of
variance with repeated measures, and a Bonferroni post hoc test. Pearson correlation coefficient assessed the relationship between changes in anthropometric, physiological and psychological variables.
Results: Zumba provided significant positive changes in maximal aerobic fitness (+3.6%), self-perception of physical strength (+16.3%) and muscular development (+18.6%), greater autonomy (+8.0%), and purpose in life (+4.4%). No significant changes were observed in the control group. In addition, some psychological changes were significantly correlated to
body fat at baseline, and changes in fitness.
Conclusions: These results highlight that Zumba is beneficial to improve fitness and well-being in healthy women, but does not change body composition. -
Cohen D, Zhao B, Okwera B, Matthews M, Delextrat A, 'Angle-specific eccentric hamstring fatigue after simulated soccer'
International Journal of Sports Physiology and Performance 10 (3) (2015) pp.325-331
ISSN: 1555-0265AbstractPublished herePurpose: To evaluate the effect of simulated soccer on the hamstrings eccentric torque-angle profile and angle of peak torque (APTeccH), and on the hamstrings:quadriceps torque ratio at specific joint angles (ASHecc:Qcon). Methods: The authors assessed dominant-limb isokinetic concentric and eccentric knee flexion and concentric knee extension at 120°/s in 9 semiprofessional male soccer players immediately before and after they completed the Loughborough Intermittent Shuttle Test (LIST). Results: The LIST resulted in significant decreases in eccentric hamstrings torque at 60°, 50°, and 10° and a significant (21.8%) decrease in ASHecc:Qcon at 10° (P < .05). APTeccH increased from 7.1° ± 1.0° to 18.8° ± 4.2° (P < .05). Eccentric hamstrings peak torque significantly declined from 185.1 ± 70.4 N·m pre-LIST to 150.9 ± 58.5 N·m post-LIST (P = .002), but there were no significant changes in hamstrings or quadriceps concentric peak torque (P = .312, .169, respectively). Conclusions: Simulated soccer results in a selective loss of eccentric hamstrings torque and hamstrings-to-quadriceps muscle balance at an extended joint position and a shift in the eccentric hamstrings APT to a shorter length, changes that could increase vulnerability to hamstrings injury. These findings suggest that injury-risk screening could be improved by evaluating the eccentric hamstrings torque-angle profile and hamstrings strength-endurance and that the development of hamstrings fatigue resistance and long-length eccentric strength may reduce injury incidence.
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Delextrat A, Matthew D, Brisswalter J, 'Exercise training modifies walking kinematics and energy cost in obese adolescents: A pilot controlled trial'
European Journal of Sport Science 15 (8) (2015) pp.727-735
ISSN: 1746-1391AbstractPublished hereThe aim of this study was to investigate the effects of a weight loss intervention based on physical exercise on the relationship between energy cost and stride frequency during walking in obese teenagers. Participants aged 13–16 years old were assigned to a training (n = 14) and control (n = 10) groups. During eight weeks, the training group performed three 60-min weekly sessions of high-intensity intermittent activities coupled with aerobic training. Body composition, gait parameters and energy cost during 4-min walking bouts at participants’ most comfortable speed and preferred stride frequency (PSF), PSF-10%, PSF + 10%, PSF-20% and PSF + 20% were measured before and after intervention. The effects of training and stride frequencies on the energy cost of walking were analysed by an ANOVA with repeated measures. The main results showed that the exercise intervention induced a significant increase in walking speed (+23.2%), and significant decreases in body mass (−1.4%), body fat percentage (−2.1%) and energy cost of walking at various frequencies (decreases ranging from −10.5% to −20.4%, p < .05). In addition, significantly greater decreases were shown at high frequencies (p < .05). No significant differences were shown in the control group (p > .05). These results suggest that this type of training is beneficial to reduce walking energy cost of obese teenagers, in particular at high frequencies. This should improve their well-being during daily activities.
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Spasic M, Krolo A, Zenic N, Delextrat A, Sekulic D, 'Reactive agility performance in handball; development and evaluation of a sport-specific measurement protocol'
Journal of Sports Science and Medicine 14 (3) (2015) pp.501-506
ISSN: 1303-2968AbstractPublished hereThere is no current study that examined sport-specific tests of reactive-agility and change-of-direction-speed (CODS) to repli-cate real-sport environment in handball (team-handball). This investigation evaluated the reliability and validity of two novel tests designed to assess reactive-agility and CODS of handball players. Participants were female (25.14 ± 3.71 years of age; 1.77 ± 0.09 m and 74.1 ± 6.1 kg) and male handball players (26.9 ± 4.1 years of age; 1.90 ± 0.09 m and 93.90±4.6 kg). Variables included body height, body mass, body mass index, broad jump, 5-m sprint, CODS and reactive-agility tests. Results showed satisfactory reliability for reactive-agility-test and CODS-test (ICC of 0.85-0.93, and CV of 2.4-4.8%). The reac-tive-agility and CODS shared less than 20% of the common variance. The calculated index of perceptual and reactive capaci-ty (P&RC; ratio between reactive-agility- and CODS-performance) is found to be valid measure in defining true-game reactive-agility performance in handball in both genders. There-fore, the handball athletes’ P&RC should be used in the evalua-tion of real-game reactive-agility performance. Future studies should explore other sport-specific reactive-agility tests and factors associated to such performance in sports involving agile maneuvers.
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Gavarry O, Aguer C, Delextrat A, Lentin G, Ayme K, Boussuges A, 'Severely obese adolescent girls rely earlier on carbohydrates during walking than normal-weight matched girls'
Journal of Sports Sciences 33 (18) (2015) pp.1871-1880
ISSN: 0264-0414AbstractPublished hereThe purpose of this study was to determine the substrate oxidation rate and the exercise intensity at which maximal lipid oxidation and ventilatory threshold (VT) occur in obese (BMI: 36.6 ± 6.3 kg · m−2) and normal-weight adolescent girls (BMI: 18.7 ± 1.6 kg · m−2) aged 14–18 years. Substrate oxidation rate was determined by gas exchange using an incremental field test involving walking. Body composition was assessed by bioelectrical impedance. Carbohydrate oxidation rates were significantly higher in obese than in normal-weight girls at speeds ranging from 4 to 6 km · h−1 (P < 0.05), whereas no significant differences were observed between groups regarding lipid oxidation rates. The crossover point of substrate utilisation and the VT were significantly lower in obese than in normal-weight adolescents (P < 0.05). Maximal lipid oxidation rate was observed at 46 ± 15 and 53 ± 15 %E (Formula presented.) O2max in obese and normal-weight adolescents, respectively. At these intensities, the Lipoxmax was significantly lower in obese than in normal-weight girls (6.7 ± 2.3 versus 8.9 ± 3.5 mg · min−1 · kg−1 FFM, P < 0.05, 95% CI: −3.7 to −0.7, d = −0.74). The present results have implications in designing interventions to promote lipid oxidation and energy expenditure during walking in severely obese adolescent girls.
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Ozkaya O, Colakoglu M, Kuzucu E, Delextrat A, 'An elliptical trainer may render the wingate all-out test more anaerobic'
Strength and Conditioning Journal 28 (3) (2014) pp.643-650
ISSN: 1524-1602AbstractThe purpose of this study was to evaluate the contribution of the 3 main energy pathways during a 30-second elliptical all-out test (EAT) compared with the Wingate all-out test (WAT). Participants were 12 male team sport players (age, 20.3 ± 1.8 years; body mass, 74.8 ± 12.4 kg; height, 176.0 ± 9.10 cm; body fat, 12.1 ± 1.0%). Net energy outputs from the oxidative, phospholytic, and glycolytic energy systems were calculated from oxygen uptake data recorded during 30-second test, the fast component of postexercise oxygen uptake kinetics, and peak blood lactate concentration, respectively. In addition, mechanical power indices were calculated. The main results showed that compared with WAT, EAT was characterized by significantly lower absolute and relative contributions of the oxidative system (16.9 ± 2.5 J vs. 19.8 ± 4.9 J; p < 0.05 and 11.2 ± 1.5% vs. 15.7 ± 3.28%; p < 0.001). In addition, significantly greater absolute and relative contributions of the phospholytic system (66.1 ± 15.8 J vs. 50.7 ± 15.9 J; p < 0.01 and 43.8 ± 6.62% vs. 39.1 ± 6.87%; p < 0.05) and a significantly greater absolute contribution of the glycolytic system (68.6 ± 18.4 J vs. 57.4 ± 13.7 J; p < 0.01) were observed in EAT compared with WAT. Finally, all power indices, except the fatigue index, were significantly greater in EAT than WAT (p < 0.05). Because of the significantly lower aerobic contribution in EAT compared with WAT, elliptical trainers may be a good alternative to cycle ergometers to assess anaerobic performance in athletes involved in whole-body activities.Published here -
Delextrat A, Hippocrate A, Leddington-Wright S, Clarke N., 'Including stretches to a massage routine improves recovery from official matches in basketball players'
Strength and Conditioning Journal 28 (3) (2014) pp.716-727
ISSN: 1524-1602AbstractThe aim of this study was to investigate the effect of incorporating stretches into a massage recovery treatment after a competitive basketball match on perceptual and physical markers of recovery. Nine men (age: 22 ± 3 years; stature: 191.2 ± 8.5 cm; body mass: 90.9 ± 10.1 kg; and body fat: 12.4 ± 4.7%) and 8 women (age: 21 ± 3 years; stature: 176.4 ± 8.1 cm; body mass: 73.9 ± 9.7 kg; and body fat: 21.9 ± 5.5%) who are national-level basketball players received a massage, a massage and stretching, or no treatment immediately after a competitive match. The perception of overall fatigue and leg soreness was assessed immediately after the treatment and 24 hours later, whereas countermovement jump (CMJ) and repeated sprint ability (RSA) were tested 24 hours after the treatment. Compared with massage, massage and stretching induced lower perception of leg soreness immediately only in women (p < 0.001; n = 0.86), whereas a longer lasting effect was observed in men, with a difference between treatments reported after 24 hours (p < 0.001; n = 0.94). Furthermore, both treatments resulted in a better CMJ performance compared with the control condition in men only (p = 0.0001; n = 0.33), and massage and stretching involved a lower performance decrement during RSA compared with massage in women only (p = 0.015; n = 0.29). The results suggest that women benefit slightly more from the combination treatment than men, and therefore this type of recovery intervention should be adopted by physiotherapists working with women teams in particular.Published here -
Delextrat A, Martinez A, 'Small-sided game training improves aerobic capacity and technical skills in basketball players'
International Journal of Sports Medicine 35 (5) (2014) pp.385-391
ISSN: 0172-4622AbstractThe aim of this study was to compare the effects of 2 training interventions based on small-sided games (SGG) and high-intensity interval training (HIT) on physical and technical performance of male junior basketball players. A secondary objective was to investigate if these effects were similar in starting and bench players. 18 players participated in a pre-testing session, 6-weeks intervention period and a post-testing session. Pre- and post-sessions involved assessments of aerobic fitness, repeated sprint ability (RSA), defensive and offensive agility, upper and lower body power, shooting and passing skills. Mixed-design analysis of variance (ANOVA) with Bonferroni corrected pairwise comparisons examined the effects of time and type of intervention on physical and technical performances. The main results showed that both interventions resulted in similar improvements in aerobic capacity (+3.4% vs. +4.1%), with greater improvements in bench players compared to starting players (+7.1% vs. +1.1%, P<0.05). However, RSA was unchanged after both interventions. In addition, compared to HIT, SSG resulted in greater improvements in defensive agility (+4.5% vs. -2.7%, P<0.05), shooting skills (+7.4% vs. -2.4%, P<0.05) and upper body power (+7.9% vs. -2.0%, P<0.05). These results suggest that SSG should be prioritized in physical conditioning of junior basketball players during the season. However, when RSA is targeted, more specific training seems necessary.Published here -
Torres-Ronda L, Delextrat A, Gonzalez-Badillo J, 'The relationship between golf performance, anthropometrics, muscular strength and power characteristics in young elite players'
International SportMed Journal 15 (2) (2014) pp.156-164
ISSN: 1528-3356AbstractBackground: The aim of this study was to determine the relationship between golf performance (handicap, drive ball speed, approach and putting accuracy), anthropometrics and muscular strength and power in young elite golfers. Type of study: Observational, descriptive and transversal study, with accidental sampling (non-randomised). Methods: Forty-four male golfers participated in the study and the following information was obtained: anthropometrics, drive ball speed, approach accuracy, putting accuracy, medicine ball throwing speed, countermovement jump, bench press and parallel full squat. The relationship between these variables was assessed using Pearson's correlation coefficient, while a regression analysis was performed to assess which parameters were the best predictors of handicap. Results: The main results showed that peak and average drive ball speeds were the only golf performance indicators significantly correlated to handicap (r = -0.58 to -0.61, P<0.001). Significant correlations were observed between drive ball speed and body mass (r = 0.4, P<0.01). In addition, handicap and drive ball speed correlated significantly with muscular strength and power, even when adjusted with the anthropometric characteristics (r = 0.50 to 0.70; P<0.01). Finally, the regression analysis showed that 68.7% of the total variance in handicap was explained by height, drive ball speed average and medicine ball throwing performance. Conclusions: The high correlations found between drive ball speed, handicap and upper- and lower-body strength suggest that muscular strength and power are important. These results have important applications as it could help coaches with optimal development of physical and sport-specific conditioning and golf training programmes.Published here -
Delextrat A, Baker J, Cohen D, Clarke N, 'Effect of a simulated soccer match on the functional hamstrings-to-quadriceps ratio in amateur female players'
Scandinavian Journal of Medicine & Science in Sports 23 (4) (2013) pp.478-486
ISSN: 0905-7188AbstractThe purpose of this study was to investigate the effect of a simulated soccer test on the functional hamstrings-to-quadriceps ratio (H:Q) in female soccer players. Fourteen amateur players (age, 26.1±4.6 years; height, 168±12cm; body mass, 62.7±5.5kg; body fat, 23.7±2.2%) performed the modified Loughborough Intermittent Shuttle Test (modified LIST). Isokinetic strength assessments of the hamstrings and quadriceps on the dominant and non-dominant legs at 120°/s were performed before and immediately after the modified LIST. H:Q was calculated as the ratio of the peak eccentric torque of the hamstrings to the peak concentric torque of the quadriceps. A two-way univariate analysis of variance was used to assess the effect of time and leg dominance on H:Q. The main results showed that the modified LIST led to a significant decrease in H:Q in the dominant (-14.1%) and non-dominant legs (-8.0%) (P=0.02). However, this decrease was not significantly different between dominant and non-dominant legs (P=0.42). These results reflect a greater risk of hamstrings tears and ACL sprains at the end of soccer matches.Published here -
Delextrat A, Calleja-González J, Hippocrate A, Clarke N, 'Effects of sports massage and intermittent cold-water immersion on recovery from matches by basketball players'
Journal of Sports Sciences 31 (1) (2013) pp.11-19
ISSN: 0264-0414AbstractThe aim of this study was to compare the effects of intermittent cold-water immersion and massage on perceptual and performance markers of recovery by basketball players after competitive matches. Eight men (age 23 ± 3 years; stature 190.5 ± 8.9 cm; body mass 90.3 ± 9.6 kg; body fat 12.8 ± 4.8%) and eight women (age 22 ± 2 years; stature 179.0 ± 8.5 cm; body mass 77.6 ± 9.2 kg; body fat 22.5 ± 6.6%) basketball players participated. Massage, cold-water immersion or control were applied immediately after competitive matches, followed by assessments of perceptual measures of recovery and physical performance, countermovement jump and repeated-sprint ability 24 h after intervention. There was lower perception of fatigue overall and in the legs immediately after the massage and cold-water immersion condition (P < 0.001; = 0.91). Furthermore, women had a lower perception of fatigue in cold-water immersion than massage at any testing time (P < 0.001; = 0.37). Jump performance was greater after cold-water immersion than the control condition (P = 0.037, = 0.37). There was no effect of any of the recovery interventions on repeated-sprint measures (P at best 0.067, at best 0.68). The results suggest that both massage and cold-water immersion improve perceptual measures of recovery. Furthermore, cold-water immersion improves jump performance although neither such immersion nor massage had an effect on repeated-sprint ability. This suggests that, overall, cold-water immersion is more useful than massage in the recovery from basketball matches, especially in women. © 2013 Copyright Taylor and Francis Group, LLC.Published here -
Delextrat A, Kraiem S, 'Heart-rate Responses By Playing Position During Ball Drills in Basketball'
International Journal of Sports Physiology and Performance 8 (2013) pp.410-418
ISSN: 1555-0265 eISSN: 1555-0273AbstractThe physiological load experienced during basketball drills is crucial to understand players' adaptation to team-sport training and plan physical-conditioning programs. Purpose: To compare mean heart-rate (HRmean) responses by playing position during 2-a-side (2v2) and 3-a-side (3v3) ball drills in male junior basketball players and explore the relationship between HRmean and repeated-sprint ability (RSA). Methods: Thirty- one players volunteered to participate in this study. On separate occasions, they performed 2v2 and 3v3 ball drills and 6 repetitions of shuttle-run sprints of 20 m (10+10 m), departing every 20 s (RSA). Ball drills took place on the full length but only half the width of the court and were three 4-min bouts separated by 1-min rest periods. An analysis of variance (ANOVA) assessed the effect of the number of players on court (2v2 vs 3v3) and playing position (guards vs forwards vs centers) on HRmean, and a Pearson correlation coefficient evaluated the relation between HRmean and RSA. Results: The main results showed greater HRmean in 2v2 than in 3v3 ball drills (P< .001) in all playing positions (90.7% ± 1.3% vs 87.6% ± 3% of HRpeak in guards, 91.3% ± 2.1% vs 87.5% ± 3.7% of HRpeak for forwards, and 88.2% ± 3.5% vs 82.2% ± 5.6% of HRpeak in centers, respectively, for 2v2 and 3v3). In addition, centers were characterized by lower HRmean than guards and forwards in 3v3 only (P - .018). Conclusions: These results suggest that 2v2 drills should be preferred to 3v3 drills for aerobic conditioning, in particular for centers. Finally, RSA does not seem to influence players' acute responses to ball drills.
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Delextrat A, Baliqi F, Clarke N, 'Repeated Sprint Ability and Stride Kinematics Are Altered Following An Official Match in National-level Basketball Players'
The Journal of Sports Medicine and Physical Fitness 53 (2) (2013) pp.112-118
ISSN: 0022-4707 eISSN: 1827-1928AbstractPublished hereAIM:
The aim of the study was to investigate the effects of playing an official national-level basketball match on repeated sprint ability (RSA) and stride kinematics. METHODS:
Nine male starting basketball players (22.8±2.2 years old, 191.3±5.8 cm, 88±10.3 kg, 12.3±4.6% body fat) volunteered to take part. Six repetitions of maximal 4-s sprints were performed on a non-motorised treadmill, separated by 21-s of passive recovery, before and immediately after playing an official match. Fluid loss, playing time, and the frequencies of the main match activities were recorded. The peak, mean, and performance decrement for average and maximal speed, acceleration, power, vertical and horizontal forces, and stride parameters were calculated over the six sprints. Differences between pre- and post-match were assessed by student t-tests. RESULTS:
Significant differences between pre- and post-tests were observed in mean speed (-3.3%), peak and mean horizontal forces (-4.3% and -17.4%), peak and mean vertical forces (-3.4% and -3.7%), contact time (+7.3%), stride duration (+4.6%) and stride frequency (-4.0%), (P<0.05). In addition, the variation in several RSA parameters, such as peak and mean speed, peak and mean acceleration, mean power, and peak and mean vertical force were significantly correlated to fluid loss and sprint, jump and shuffle frequencies (P<0.05). CONCLUSION:
These results highlight that the impairment in repeated sprint ability depends on the specific activities performed, and that replacing fluid loss through sweating during a match is crucial. -
Caprino D, Clarke N, Delextrat A, 'The effect of an official match on repeated sprint ability in junior basketball players'
Journal of Sports Sciences 30 (11) (2012) pp.1165-1173
ISSN: 0264-0414AbstractThe aim of this study was to investigate the effect of an official basketball match on repeated sprint ability indices in male junior players. Ten (16 ± 1 years old; 183.6 ± 7.0 cm; 76.6 ± 8.0 kg) starting players for their teams performed three repeated sprint ability tests, before, at half-time and immediately after an official match. Each repeated sprint ability test consisted of 10 shuttle-run sprints of 30 m (15 + 15 m) separated by 30 seconds of passive recovery. The matches were video-taped to determine the frequency of eight types of movement patterns, and blood lactate concentration was measured before and immediately after each repeated sprint ability test. Differences in total time, ideal time and percentage decrement between tests was assessed by a one-way analysis of variance (ANOVA) with repeated measures, while a two-way ANOVA with repeated measures was used to identify differences in blood lactate concentration. The main results indicated a significant decrease in total movement frequency (-9.9%), high-intensity activity frequency (-13.3%), run frequency (-13.0%) and sprint frequency (-23.3%) in the second compared to the first half, and significantly worse total time and ideal time at the end of the match, compared to the start and half-time (differences ranging from -2.1% to -2.9%, P & 0.05). The practical implications of these findings suggest that regional basketball players should participate in conditioning sessions that focus on the improvement of repeated sprint ability. © 2012 Copyright Taylor and Francis Group, LLC.Published here -
Delextrat A, Trochym E, Calleja-González J, 'Effect of a typical in-season week on strength jump and sprint performances in national-level female basketball players'
The Journal of Sports Medicine and Physical Fitness 52 (2) (2012) pp.128-136
ISSN: 0022-4707AbstractAim. The aim of this study was to investigate the effect of a typical in-season week including four practice sessions and one competitive game on strength, jump and sprint performances in national-level female basketball players. Methods. Nine female basketball players (24.3±4.1 years old, 173.0±7.9 cm, 65.1±10.9 kg, 21.1±3.8% body fat) participated in ten testing sessions, before and immediately after practices and game (five pre- and five post-tests). Each session involved isokinetic peak torque measurements of the quadriceps and hamstrings of the dominant leg at 60°.S , countermovement jump (CMJ) and 20-m sprint. Fluid loss and subjective training load were measured during each practice session, while the frequencies of the main movements performed during the game were recorded. A two-way ANOVA was used to asses the effect of each practice/game and the effect of the day of the week on performances, and the relationship between performance variations and variables recorded during practices/game were analyzed by a Pearson correlation coefficient. Results. Individual sessions induced significant decreases in lower limb strength (from 4.6 to 10.9%, P<0.05), CMJ (12.6% to 19.6%, P<0.05) and 20-m sprint (1.3% to 7.3%, P<0.05). Performances returned to baseline before the subsequent pre-test session, except on day 3. Conclusion. These impairments in performance highlight that coaches should plan conditioning programmes based on repeated sprint and repeated jump ability, and monitor the recovery of their players' strength, sprint and jump capacities following specific sessions.Published here -
Delextrat A, Matthew D, Cohen D, Brisswalter J, 'Effect of stride frequency on the energy cost of walking in obese teenagers'
Human Movement Science 30 (1) (2011) pp.115-124
ISSN: 0167-9457AbstractThe aim of this study was to compare the energy cost of obese and non-obese teenagers while walking at their preferred speed and different stride frequencies. Twelve obese and twelve non-obese teenagers walked continuously on the treadmill at their most comfortable speed for 6 periods of 4. min each. Each period corresponded to a specific stride frequency: preferred (PSF), force-driven harmonic oscillator (FDHO), PSF. +. 10%, PSF. +. 20%, PSF. - 10% and PSF. - 20%. Cardiorespiratory parameters were collected between the 3rd and 4th minute of each stage, and used to calculate the energy cost of walking (EC). The main results showed a significantly higher cost of walking expressed relative to lean body mass. In addition, a U-shaped relationship between EC and stride frequency was shown in both groups, with PSF and FDHO leading to a significantly lower value compared to all other frequencies. This showed first, that FDHO is a good predictor of PSF and minimal energy cost of walking in both groups, and second, that excess body fat does not affect the relationship between energy expenditure and stride frequency. Walking at lower or higher than preferred frequencies could be used as an exercise mode to promote weight loss in obese teenagers. © 2010 Elsevier B.V.Published here -
Cohen D D, Voss C, Taylor MJD, Delextrat A, Ogunleye AA, Sandercock GRH, 'Ten-year secular changes in muscular fitness in English children'
Acta Paediatrica: Nurturing the Child 100 (10) (2011) pp.e175-e177
ISSN: 0803-5253 eISSN: 1651-2227Published here -
Delextrat A, Gregory J, Cohen D, 'The use of the functional H:Q ratio to assess fatigue in soccer'
International Journal of Sports Medicine 31 (3) (2010) pp.192-197
ISSN: 0172-4622 eISSN: 1439-3964AbstractThe aim of this study was to investigate the effects of fatigue induced by a field test representative of soccer specific movements on different hamstrings:quadriceps ratios in the dominant and non-dominant legs at two different velocities. Eight male football players (age: 21.3±2.3 years; height: 178±8cm; body mass: 78±9kg; playing level: British University Southern conference-3B) performed a pre-test to assess the concentric and eccentric strength of the hamstrings and the quadriceps at 60°s and 180°s , The Loughborough Intermittent Shuttle Test (LIST) to simulate soccer, and a post-test similar to the pre-test. The main findings demonstrated significant decreases in the H :Q ratio (calculated as the maximal concentric hamstrings strength divided by the maximal concentric quadriceps strength) in the dominant leg at 180°s and in the functional ratio H :Q (calculated as the maximal eccentric hamstrings strength divided by the maximal concentric quadriceps strength) in the dominant leg at 60°s and 180°s . In addition, significant correlations were observed between physiological parameters measured during the soccer-specific exercise and H :Q only. These results suggested that the functional H :Q ratio is more representative of fatigue induced by soccer than the conventional H :Q ratio. Eccentric strength training at high velocities may be necessary to reduce injury risk in soccer players. © Georg Thieme Verlag KG Stuttgart · New York.Published here
Conference papers
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Joshi S, Weedon BD, Esser P, Liu YC, Springett DN, Meaney A, Delextrat A, Kemp S, Ward T, Ayaz H, Dawes H, 'Revealing Cortical Activation Patterns of Novel Task Performance in Children With Low Coordination via fNIRS'
Frontiers in Human Neuroscience (2018)
ISSN: 1662-5161Published here Open Access on RADAR
Other publications
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Esser P, Weedon BD, Meaney A, Delextrat A, Mahmoud W, Salvan P, Wassenaar T, Joshi S, Liu Y, Kemp S, Ward T, Johansen-Berg J, Dawes H, 'Brain plasticity and motor skill competence development in adolescents with poor motor skill acquisition and performance: Trial Protocol for a controlled experimental paradigm', (2019)
Published here
Professional information
Memberships of professional bodies
- BASES accredited sport scientist, in the area of exercise physiology.
Conferences
Invited speaker:
- Propuesta de small-sided games para deportes indoor: Baloncesto. III Jornadas de Actualización en Rendimiento Deportivo,Vitoria, 23rd of September 2016.
- Avaliações Físicas no Basquetebol: considerações sobre as posições no jogo. Universidade Católica de Brasília (UCB), Brasil, 25 de Agosto 2015.
- Análisis científico de la evolución del juego. V Jornadas de actualización en las áreas de medicina, preparación física y deporte, San Sebastian, Spain, 21-23 June 2012.
- Carga externa en baloncesto: Su análisis e interpretatión. V Jornadas de actualización en las áreas de medicina, preparación física y deporte,” San Sebastian, Spain, 25 June 2011.
- Coordination and skill acquisition in team sports: applications to coaching. 11. MeƋunarodna konferencija “Kondicijska Priprema Sportaša”. Zagreb, 19th of February 2010.
- Effects of previous swimming exercise on cycling energy cost in high-level triathletes. Applied Sports Science International Symposium, Anglia Ruskin university, Cambridge, UK, 20th of June 2006.
Recent oral communications:
- Delextrat A., Bateman, J., Esser, P., Targen, N., and Dawes, H. The potential benefits of Zumba Gold in people with Parkinson’s: a feasibility study. Winter Congress of the Society for Research in Rehabilitation, 2nd of February 2016, London, UK.
- Delextrat, A. and Cohen, D.D. Strength-endurance training reduces hamstrings peak torque drop in simulated football. International Conference of Sport Rehabilitation and Traumatology, Football Medicine Strategies for Player Care, London, 11th – 12th April 2015.
- Delextrat, A., Baliqi, F., Clarke, N.D. Repeated Sprint Ability And Stride Kinematics Are Altered Following An Official Match In National-level Basketball Players.18th annual congress of the European College of Sport Science – ECSS, Barcelona 2013.
- Delextrat, Ferguson and Jemni: Effects of football-specific fatigue on risk factors for hamstring and ACL injuries in female players.II International Congress of Reconditioning and Prevention of Football Injuries on the 19th of April 2024.
- Delextrat, Piquet, Ferguson, and Jemni: Effects of fatigue on risk factors for ACL injuries in female footballers.“Next generation leaders”, Isokinetic conference in London, 27th-29th of May 2023
Further details
Other experience
- 2004- 2012 Senior Lecturer in Sports Science, London Metropolitan University, UK.
- Exercise physiologist at the Fitness Assessment Centre, London Metropolitan University, UK.
- 2003-2004 Post-doctoral position, Greenwich University, UK: “Biomechanical analysis of the shooting action in netball”
- 2000-2003 Part-time lecturer in Sports Science, University of the South, Toulon-Var, France.