19 results on '"Imen Moussa-Chamari"'
Search Results
2. Ramadan intermittent fasting induced poorer training practices during the COVID-19 lockdown: A global cross-sectional study with 5529 athletes from 110 countries
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Jad Washif, David B. Pyne, Øyvind Sandbakk, Khaled Trabelsi, Abdul Rashid Aziz, Christopher Beaven, Isabel Krug, Iñigo Mujika, Achraf Ammar, Anis Chaouachi, Imen Moussa-Chamari, Asma Aloui, Hamdi Chtourou, Abdulaziz Farooq, Monoem Haddad, Mohamed Romdhani, Paul Salamh, Montassar Tabben, Del Wong, Yacine Zerguini, Matthew D. DeLang, Lee Taylor, Helmi Ben Saad, and Karim Chamari
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crowdsource data ,global sports ,vulnerable athletes ,remote training ,training perception ,training load ,Sports medicine ,RC1200-1245 ,Biology (General) ,QH301-705.5 - Abstract
Ramadan intermittent fasting during the COVID-19 lockdown (RIFL) may present unique demands. We investigated training practices (i.e., training load and training times) of athletes, using pre-defined survey criteria/questions, during the ‘first’ COVID-19 lockdown, comparing RIFL to lockdown-alone (LD) in Muslim athletes. Specifically, a within-subject, survey-based study saw athletes (n = 5,529; from 110 countries/territories) training practices (comparing RIFL to LD) explored by comparative variables of: sex; age; continent; athlete classification (e.g., world-class); sport classification (e.g., endurance); athlete status (e.g., professional); and level of training knowledge and beliefs/attitudes (ranked as: good/moderate/poor). During RIFL (compared to LD), athlete perceptions (ranges presented given variety of comparative variables) of their training load decreased (46–62%), were maintained (31–48%) or increased (2–13%). Decreases (≥ 5%, p < 0.05) affected more athletes aged 30–39 years than those 18–29 years (60 vs 55%); more national than international athletes (59 vs 51%); more team sports than precision sports (59 vs 46%); more North American than European athletes (62 vs 53%); more semi-professional than professional athletes (60 vs 54%); more athletes who rated their beliefs/attitudes ‘good’ compared to ‘poor’ and ‘moderate’ (61 vs 54 and 53%, respectively); and more athletes with ‘moderate’ than ‘poor’ knowledge (58 vs 53%). During RIFL, athletes had different strategies for training times, with 13–29% training twice a day (i.e., afternoon and night), 12–26% at night only, and 18–36% in the afternoon only, with ranges depending on the comparative variables. Training loads and activities were altered negatively during RIFL compared to LD. It would be prudent for decision-makers responsible for RIFL athletes to develop programs to support athletes during such challenges.
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- 2022
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3. The effect of caffeine, nap opportunity and their combination on biomarkers of muscle damage and antioxidant defence during repeated sprint exercise
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Mohamed Romdhani, Nizar Souissi, Ismail Dergaa, Imen Moussa-Chamari, Yassine Chaabouni, Kacem Mahdouani, Olfa Abene, Tarak Driss, Karim Chamari, and Omar Hammouda
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psychostimulant ,daytime sleep ,ergogenic aid ,inflammation ,oxidative stress ,high-intensity exercise ,Sports medicine ,RC1200-1245 ,Biology (General) ,QH301-705.5 - Abstract
To investigate the effect of 20 min nap opportunity (N20), 5 mg · kg -1 of caffeine (CAF) and their combination (CAF+N20) on the biochemical response (energetic biomarkers, biomarkers of muscle damage and enzymatic antioxidants) to the running-based anaerobic sprint test. Fourteen highly trained male athletes completed in a double-blind, counterbalanced and randomized order four test sessions: no nap with placebo (PLA), N20, CAF and CAF+N20. Compared to PLA, all treatments enhanced maximum and mean powers. Minimum power was higher [(mean difference) 58.6 (95% confidence interval = 1.31–116) Watts] after CAF and [102 (29.9–175) Watts] after CAF+N20 compared to N20. Also, plasma glucose was higher after CAF [0.81 (0.18–1.45) mmol·l -1 ] and CAF+N20 [1.03 (0.39–1.64) mmol·l -1 ] compared to N20. However, plasma lactate was higher [1.64 (0.23–3.03) mmol ·l -1 ] only after N20 compared to pre-exercise, suggesting a higher anaerobic glycolysis during N20 compared to PLA, CAF and CAF+N20. Caffeine ingestion increased post-exercise creatine kinase with [54.3 (16.7–91.1) IU·l -1 ] or without napping [58.9 (21.3–96.5) IU·l -1 ] compared to PLA. However, superoxide dismutase was higher after napping with [339 (123–554) U·gHB -1 ] or without caffeine [410 (195–625) U·gHB -1] compared to PLA. Probably because of the higher aerobic glycolysis contribution in energy synthesis, caffeine ingestion resulted in better repeated sprint performance during CAF and CAF+N20 sessions compared to N20 and PLA. Caffeine ingestion resulted in higher muscle damage, and the short nap enhanced antioxidant defence with or without caffeine ingestion.
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- 2021
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4. Ramadan Observance Exacerbated the Negative Effects of COVID-19 Lockdown on Sleep and Training Behaviors: A International Survey on 1,681 Muslim Athletes
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Mohamed Romdhani, Achraf Ammar, Khaled Trabelsi, Hamdi Chtourou, Jacopo A. Vitale, Liwa Masmoudi, Mathieu Nédélec, Dale E. Rae, Ramzi A. Al Horani, Helmi Ben Saad, Nicola Bragazzi, Gürhan Dönmez, Ismail Dergaa, Tarak Driss, Abdulaziz Farooq, Omar Hammouda, Nesrine Harroum, Bahar Hassanmirzaei, Karim Khalladi, Syrine Khemila, Leonardo Jose Mataruna-Dos-Santos, Imen Moussa-Chamari, Iñigo Mujika, Hussein Muñoz Helú, Amin Norouzi Fashkhami, Laisa Liane Paineiras-Domingos, Mehrshad Rahbari Khaneghah, Yoshitomo Saita, Maher Souabni, Nizar Souissi, Jad Adrian Washif, Johanna Weber, Piotr Zmijewski, Lee Taylor, Sergio Garbarino, and Karim Chamari
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confinement ,pandemic ,religious fasting ,sleep-wake pattern ,training load ,Nutrition. Foods and food supply ,TX341-641 - Abstract
ObjectiveDisrupted sleep and training behaviors in athletes have been reported during the COVID-19 pandemic. We aimed at investigating the combined effects of Ramadan observance and COVID-19 related lockdown in Muslim athletes.MethodsFrom an international sample of athletes (n = 3,911), 1,681 Muslim athletes (from 44 countries; 25.1 ± 8.7 years, 38% females, 41% elite, 51% team sport athletes) answered a retrospective, cross-sectional questionnaire relating to their behavioral habits pre- and during- COVID-19 lockdown, including: (i) Pittsburgh sleep quality index (PSQI); (ii) insomnia severity index (ISI); (iii) bespoke questions about training, napping, and eating behaviors, and (iv) questions related to training and sleep behaviors during-lockdown and Ramadan compared to lockdown outside of Ramadan. The survey was disseminated predominately through social media, opening 8 July and closing 30 September 2020.ResultsThe lockdown reduced sleep quality and increased insomnia severity (both p < 0.001). Compared to non-Muslim (n = 2,230), Muslim athletes reported higher PSQI and ISI scores during-lockdown (both p < 0.001), but not pre-lockdown (p > 0.05). Muslim athletes reported longer (p < 0.001; d = 0.29) and later (p < 0.001; d = 0.14) daytime naps, and an increase in late-night meals (p < 0.001; d = 0.49) during- compared to pre-lockdown, associated with lower sleep quality (all p < 0.001). Both sleep quality (χ2 = 222.6; p < 0.001) and training volume (χ2 = 342.4; p < 0.001) were lower during-lockdown and Ramadan compared to lockdown outside of Ramadan in the Muslims athletes.ConclusionMuslim athletes reported lower sleep quality and higher insomnia severity during- compared to pre-lockdown, and this was exacerbated by Ramadan observance. Therefore, further attention to Muslim athletes is warranted when a circadian disrupter (e.g., lockdown) occurs during Ramadan.
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- 2022
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5. Lockdown Duration and Training Intensity Affect Sleep Behavior in an International Sample of 1,454 Elite Athletes
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Mohamed Romdhani, Hugh H. K. Fullagar, Jacopo A. Vitale, Mathieu Nédélec, Dale E. Rae, Achraf Ammar, Hamdi Chtourou, Ramzi A. Al Horani, Helmi Ben Saad, Nicola Luigi Bragazzi, Gürhan Dönmez, Ismail Dergaa, Tarak Driss, Abdulaziz Farooq, Omar Hammouda, Nesrine Harroum, Bahar Hassanmirzaei, Karim Khalladi, Syrine Khemila, Leonardo Jose Mataruna-Dos-Santos, Imen Moussa-Chamari, Iñigo Mujika, Hussein Muñoz Helú, Amin Norouzi Fashkhami, Laisa Liane Paineiras-Domingos, Mehrshad Rahbari Khaneghah, Yoshitomo Saita, Nizar Souissi, Khaled Trabelsi, Jad Adrian Washif, Johanna Weber, Piotr Zmijewski, Lee Taylor, Sergio Garbarino, and Karim Chamari
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highly-trained athletes ,home-confinement duration ,pandemic (COVID-19) ,training load ,sleep disturbance ,Physiology ,QP1-981 - Abstract
Objective: To investigate the effect of 1) lockdown duration and 2) training intensity on sleep quality and insomnia symptoms in elite athletes.Methods: 1,454 elite athletes (24.1 ± 6.7 years; 42% female; 41% individual sports) from 40 countries answered a retrospective, cross-sectional, web-based questionnaire relating to their behavioral habits pre- and during- COVID-19 lockdown, including: 1) Pittsburgh sleep quality index (PSQI); 2) Insomnia severity index (ISI); bespoke questions about 3) napping; and 4) training behaviors. The association between dependent (PSQI and ISI) and independent variables (sleep, napping and training behaviors) was determined with multiple regression and is reported as semi-partial correlation coefficient squared (in percentage).Results: 15% of the sample spent < 1 month, 27% spent 1–2 months and 58% spent > 2 months in lockdown. 29% self-reported maintaining the same training intensity during-lockdown whilst 71% reduced training intensity. PSQI (4.1 ± 2.4 to 5.8 ± 3.1; mean difference (MD): 1.7; 95% confidence interval of the difference (95% CI): 1.6–1.9) and ISI (5.1 ± 4.7 to 7.7 ± 6.4; MD: 2.6; 95% CI: 2.3–2.9) scores were higher during-compared to pre-lockdown, associated (all p < 0.001) with longer sleep onset latency (PSQI: 28%; ISI: 23%), later bedtime (PSQI: 13%; ISI: 14%) and later preferred time of day to train (PSQI: 9%; ISI: 5%) during-lockdown. Those who reduced training intensity during-lockdown showed higher PSQI (p < 0.001; MD: 1.25; 95% CI: 0.87–1.63) and ISI (p < 0.001; MD: 2.5; 95% CI: 1.72–3.27) scores compared to those who maintained training intensity. Although PSQI score was not affected by the lockdown duration, ISI score was higher in athletes who spent > 2 months confined compared to those who spent < 1 month (p < 0.001; MD: 1.28; 95% CI: 0.26–2.3).Conclusion: Reducing training intensity during the COVID-19-induced lockdown was associated with lower sleep quality and higher insomnia severity in elite athletes. Lockdown duration had further disrupting effects on elite athletes’ sleep behavior. These findings could be of relevance in future lockdown or lockdown-like situations (e.g., prolonged illness, injury, and quarantine after international travel).
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- 2022
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6. The effect of post-lunch napping on mood, reaction time, and antioxidant defense during repeated sprint exercice.
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Mohamed Romdhani, Ismail Dergaa, Imen Moussa-Chamari, Nizar Souissi, Yassine Chaabouni, Kacem Mahdouani, Olfa Abene, Tarak Driss, Karim Chamari, and Omar Hammouda
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midday sleep ,short-term exercise ,biomarkers of muscle damage ,antioxidant status ,ergogenic aid ,cognitive performance ,Sports medicine ,RC1200-1245 ,Biology (General) ,QH301-705.5 - Abstract
To compare the effects of two nap opportunities (20 and 90 min) to countermeasure the transient naturally occurring increased sleepiness and decreased performances during the post-lunch dip (PLD). Fourteen highly trained judokas completed in a counterbalanced and randomized order three test sessions (control (Nonap), 20- (N20) and 90-min (N90) nap opportunities). Test sessions consisted of the running-based anaerobic sprint test (RAST), simple and multiple-choice reaction times (MCRT) and the Epworth sleepiness scale (ESS). From the RAST, the maximum (Pmax), mean (Pmean) and minimum (Pmin) powers were calculated. Blood samples were taken before and after the RAST to measure the effect of pre-exercise napping on energetic and muscle damage biomarkers and antioxidant defense. N20 increased Pmax and Pmean compared to No-nap (p < 0.001, d = 0.59; d = 0.66) and N90 (p < 0.001, d = 0.98; d = 0.72), respectively. Besides, plasma lactate and creatinine increased only when the exercise was performed after N20. Both N20 (p < 0.001, d = 1.18) and N90 (p < 0.01, d = 0.78) enhanced post-exercise superoxide dismutase activity compared to No-nap. However, only N20 enhanced post-exercise glutathione peroxidase activity (p < 0.001, d = 1.01) compared to pre-nap. Further, MCRT performance was higher after N20 compared to No-nap and N90 (p < 0.001, d = 1.15; d = 0.81, respectively). Subjective sleepiness was lower after N20 compared to No-nap (p < 0.05, d = 0.92) and N90 (p < 0.01, d = 0.89). The opportunity to nap for 20 min in the PLD enhanced RAST, MCRT performances, and antioxidant defense, and decreased sleepiness. However, the opportunity of 90 min nap was associated with decreased repeated sprint performances and increased sleepiness, probably because of the sleep inertia.
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- 2021
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7. Difference Asymmetry between Preferred Dominant and Non-Dominant Legs in Muscular Power and Balance among Sub-Elite Soccer Players in Qatar
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Monoem Haddad, Zied Abbes, Nidhal Zarrouk, Zlatan Aganovic, Albraa Hulweh, Imen Moussa-Chamari, and David G. Behm
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asymmetry ,soccer ,balance ,jumps ,Mathematics ,QA1-939 - Abstract
The objective of this study was to determine and compare leg asymmetry between preferred dominant and non-dominant legs in muscular power and balance among sub-elite soccer (football) players in Qatar. Thirty-two professional local soccer players from the Qatar Stars League (Second Division) participated in the study (23.1 ± 6.1 years). They were classified according to their preferred dominant leg (preferred leg to kick the ball). Twenty-two players had a right dominant leg, and the remaining ten had a left dominant leg. Countermovement jump (CMJ) was used to measure unilateral and bilateral vertical jump performances. The Y-balance test (YBT) was used to assess dynamic balance. No significant differences were found between the dominant and non-dominant leg for CMJ flight height (p > 0.05; asymmetry index (AI) = 1.83 ± 11.46) or the relative and absolute reach distance derived from the YBT (p > 0.05; AI (relative) = −0.45 ± 9.68, AI (absolute) = −0.60 ± 12.3). Bilateral asymmetry in dynamic balance was not significant for any of the anterior, posteromedial, or the posterolateral reaching directions (p > 0.05). The selected football players demonstrated an acceptable level of leg symmetry for power and dynamic balance. These findings may prove helpful for the assessment and evaluation of talents and should help to develop and optimize training regimes.
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- 2023
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8. The Effect of Experimental Recuperative and Appetitive Post-lunch Nap Opportunities, With or Without Caffeine, on Mood and Reaction Time in Highly Trained Athletes
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Mohamed Romdhani, Nizar Souissi, Ismael Dergaa, Imen Moussa-Chamari, Olfa Abene, Hamdi Chtourou, Zouheir Sahnoun, Tarak Driss, Karim Chamari, and Omar Hammouda
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sleep restriction ,alertness ,psycho-stimulants ,midday sleep ,cognitive performance ,Psychology ,BF1-990 - Abstract
Purpose: To investigate the effects of placebo (PLA), 20 min nap opportunity (N20), 5mg·kg−1 of caffeine (CAF), and their combination (CAF+N20) on sleepiness, mood and reaction-time after partial sleep deprivation (PSD; 04h30 of time in bed; study 1) or after normal sleep night (NSN; 08h30 of time in bed; study 2).Methods: Twenty-three highly trained athletes (study 1; 9 and study 2; 14) performed four test sessions (PLA, CAF, N20 and CAF+N20) in double-blind, counterbalanced and randomized order. Simple (SRT) and two-choice (2CRT) reaction time, subjective sleepiness (ESS) and mood state (POMS) were assessed twice, pre- and post-intervention.Results: SRT was lower (i.e., better performance) during CAF condition after PSD (pre: 336 ± 15 ms vs. post: 312 ± 9 ms; p < 0.001; d = 2.07; Δ% = 7.26) and NSN (pre: 350 ± 39 ms vs. post: 323 ± 32 ms; p < 0.001; d = 0.72; Δ% = 7.71) compared to pre-intervention. N20 decreased 2CRT after PSD (pre: 411 ± 13 ms vs. post: 366 ± 20 ms; p < 0.001; d = 2.89; Δ% = 10.81) and NSN (pre: 418 ± 29 ms vs. post: 375 ± 40 ms; p < 0.001; d = 1.23; Δ% = 10.23). Similarly, 2CRT was shorter during CAF+N20 sessions after PSD (pre: 406 ± 26 ms vs. post: 357 ± 17 ms; p < 0.001; d = 2.17; Δ% = 12.02) and after NSN (pre: 386 ± 33 ms vs. post: 352 ± 30 ms; p < 0.001; d = 1.09; Δ% = 8.68). After PSD, POMS score decreased after CAF (p < 0.001; d = 2.38; Δ% = 66.97) and CAF+N20 (p < 0.001; d = 1.68; Δ% = 46.68). However, after NSN, only N20 reduced POMS (p < 0.001; d = 1.05; Δ% = 78.65) and ESS (p < 0.01; d = 0.71; Δ% = 19.11).Conclusion: After PSD, all interventions reduced sleepiness and only CAF enhanced mood with or without napping. However, only N20 enhanced mood and reduced sleepiness after NSN. Caffeine ingestion enhanced SRT performance regardless of sleep deprivation. N20, with or without caffeine ingestion, enhanced 2CRT independently of sleep deprivation. This suggests a different mode of action of napping and caffeine on sleepiness, mood and reaction time.
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- 2021
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9. COVID-19 Lockdown
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Jad Adrian Washif, Øyvind Sandbakk, Stephen Seiler, Thomas Haugen, Abdulaziz Farooq, Ken Quarrie, Dina C. Janse van Rensburg, Isabel Krug, Evert Verhagen, Del P. Wong, Iñigo Mujika, Cristina Cortis, Monoem Haddad, Omid Ahmadian, Mahmood Al Jufaili, Ramzi A. Al-Horani, Abdulla Saeed Al-Mohannadi, Asma Aloui, Achraf Ammar, Fitim Arifi, Abdul Rashid Aziz, Mikhail Batuev, Christopher Martyn Beaven, Ralph Beneke, Arben Bici, Pallawi Bishnoi, Lone Bogwasi, Daniel Bok, Omar Boukhris, Daniel Boullosa, Nicola Bragazzi, Joao Brito, Roxana Paola Palacios Cartagena, Anis Chaouachi, Stephen S. Cheung, Hamdi Chtourou, Germina Cosma, Tadej Debevec, Matthew D. DeLang, Alexandre Dellal, Gürhan Dönmez, Tarak Driss, Juan David Peña Duque, Cristiano Eirale, Mohamed Elloumi, Carl Foster, Emerson Franchini, Andrea Fusco, Olivier Galy, Paul B. Gastin, Nicholas Gill, Olivier Girard, Cvita Gregov, Shona Halson, Omar Hammouda, Ivana Hanzlíková, Bahar Hassanmirzaei, Kim Hébert-Losier, Hussein Muñoz Helú, Tomás Herrera-Valenzuela, Florentina J. Hettinga, Louis Holtzhausen, Olivier Hue, Antonio Dello Iacono, Johanna K. Ihalainen, Carl James, Saju Joseph, Karim Kamoun, Mehdi Khaled, Karim Khalladi, Kwang Joon Kim, Lian-Yee Kok, Lewis MacMillan, Leonardo Jose Mataruna-Dos-Santos, Ryo Matsunaga, Shpresa Memishi, Grégoire P. Millet, Imen Moussa-Chamari, Danladi Ibrahim Musa, Hoang Minh Thuan Nguyen, Pantelis T. Nikolaidis, Adam Owen, Johnny Padulo, Jeffrey Cabayan Pagaduan, Nirmala Panagodage Perera, Jorge Pérez-Gómez, Lervasen Pillay, Arporn Popa, Avishkar Pudasaini, Alizera Rabbani, Tandiyo Rahayu, Mohamed Romdhani, Paul Salamh, Abu-Sufian Sarkar, Andy Schillinger, Heny Setyawati, Navina Shrestha, Fatona Suraya, Montassar Tabben, Khaled Trabelsi, Axel Urhausen, Maarit Valtonen, Johanna Weber, Rodney Whiteley, Adel Zrane, Yacine Zerguini, Piotr Zmijewski, Helmi Ben Saad, David B. Pyne, Lee Taylor, Karim Chamari, Public and occupational health, AMS - Sports, and APH - Health Behaviors & Chronic Diseases
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Male ,urheilulajit ,sukupuolierot ,crowd-sourced data ,multinational sample ,online survey ,perception ,remote training ,Physical Therapy, Sports Therapy and Rehabilitation ,crowd-sourced data, multinational sample, online survey, perception, remote training ,male ,Surveys and Questionnaires ,Humans ,harjoittelu ,Orthopedics and Sports Medicine ,humans ,PESQUISA ,athletes ,communicable disease control ,female ,surveys and questionnaires ,COVID-19 ,sports ,1106 Human Movement and Sports Sciences, 1116 Medical Physiology, 1701 Psychology ,kansainvälinen vertailu ,C600 ,Athletes ,poikkeusolot ,Communicable Disease Control ,Settore M-EDF/02 - Metodi e Didattiche delle Attivita' Sportive ,Female ,Sport Sciences ,survey-tutkimus ,Sports ,urheilijat - Abstract
Purpose: To investigate differences in athletes’ knowledge, beliefs, and training practices during COVID-19 lockdowns with reference to sport classification and sex. This work extends an initial descriptive evaluation focusing on athlete classification. Methods: Athletes (12,526; 66% male; 142 countries) completed an online survey (May–July 2020) assessing knowledge, beliefs, and practices toward training. Sports were classified as team sports (45%), endurance (20%), power/technical (10%), combat (9%), aquatic (6%), recreational (4%), racquet (3%), precision (2%), parasports (1%), and others (1%). Further analysis by sex was performed. Results: During lockdown, athletes practiced body-weight-based exercises routinely (67% females and 64% males), ranging from 50% (precision) to 78% (parasports). More sport-specific technical skills were performed in combat, parasports, and precision (∼50%) than other sports (∼35%). Most athletes (range: 50% [parasports] to 75% [endurance]) performed cardiorespiratory training (trivial sex differences). Compared to prelockdown, perceived training intensity was reduced by 29% to 41%, depending on sport (largest decline: ∼38% in team sports, unaffected by sex). Some athletes (range: 7%–49%) maintained their training intensity for strength, endurance, speed, plyometric, change-of-direction, and technical training. Athletes who previously trained ≥5 sessions per week reduced their volume (range: 18%–28%) during lockdown. The proportion of athletes (81%) training ≥60 min/session reduced by 31% to 43% during lockdown. Males and females had comparable moderate levels of training knowledge (56% vs 58%) and beliefs/attitudes (54% vs 56%). Conclusions: Changes in athletes’ training practices were sport-specific, with few or no sex differences. Team-based sports were generally more susceptible to changes than individual sports. Policy makers should provide athletes with specific training arrangements and educational resources to facilitate remote and/or home-based training during lockdown-type events.
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- 2022
10. The effect of caffeine, nap opportunity and their combination on biomarkers of muscle damage and antioxidant defence during repeated sprint exercise
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Mohamed Romdhani, Nizar Souissi, Ismail Dergaa, Imen Moussa-Chamari, Yassine Chaabouni, Kacem Mahdouani, Olfa Abene, Tarak Driss, Karim Chamari, and Omar Hammouda
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Physiology (medical) ,Physical Therapy, Sports Therapy and Rehabilitation ,Orthopedics and Sports Medicine - Abstract
To investigate the effect of 20 min nap opportunity (N20), 5 mg · kg
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- 2022
11. Correction to: Training During the COVID-19 Lockdown: Knowledge, Beliefs, and Practices of 12,526 Athletes from 142 Countries and Six Continents
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Jad Adrian Washif, Abdulaziz Farooq, Isabel Krug, David B. Pyne, Evert Verhagen, Lee Taylor, Del P. Wong, Iñigo Mujika, Cristina Cortis, Monoem Haddad, Omid Ahmadian, Mahmood Al Jufaili, Ramzi A. Al-Horani, Abdulla Saeed Al-Mohannadi, Asma Aloui, Achraf Ammar, Fitim Arifi, Abdul Rashid Aziz, Mikhail Batuev, Christopher Martyn Beaven, Ralph Beneke, Arben Bici, Pallawi Bishnoi, Lone Bogwasi, Daniel Bok, Omar Boukhris, Daniel Boullosa, Nicola Bragazzi, Joao Brito, Roxana Paola Palacios Cartagena, Anis Chaouachi, Stephen S. Cheung, Hamdi Chtourou, Germina Cosma, Tadej Debevec, Matthew D. DeLang, Alexandre Dellal, Gürhan Dönmez, Tarak Driss, Juan David Peña Duque, Cristiano Eirale, Mohamed Elloumi, Carl Foster, Emerson Franchini, Andrea Fusco, Olivier Galy, Paul B. Gastin, Nicholas Gill, Olivier Girard, Cvita Gregov, Shona Halson, Omar Hammouda, Ivana Hanzlíková, Bahar Hassanmirzaei, Thomas Haugen, Kim Hébert-Losier, Hussein Muñoz Helú, Tomás Herrera-Valenzuela, Florentina J. Hettinga, Louis Holtzhausen, Olivier Hue, Antonio Dello Iacono, Johanna K. Ihalainen, Carl James, Dina C. Janse van Rensburg, Saju Joseph, Karim Kamoun, Mehdi Khaled, Karim Khalladi, Kwang Joon Kim, Lian-Yee Kok, Lewis MacMillan, Leonardo Jose Mataruna-Dos-Santos, Ryo Matsunaga, Shpresa Memishi, Grégoire P. Millet, Imen Moussa-Chamari, Danladi Ibrahim Musa, Hoang Minh Thuan Nguyen, Pantelis T. Nikolaidis, Adam Owen, Johnny Padulo, Jeffrey Cayaban Pagaduan, Nirmala Panagodage Perera, Jorge Pérez-Gómez, Lervasen Pillay, Arporn Popa, Avishkar Pudasaini, Alireza Rabbani, Tandiyo Rahayu, Mohamed Romdhani, Paul Salamh, Abu-Sufian Sarkar, Andy Schillinger, Stephen Seiler, Heny Setyawati, Navina Shrestha, Fatona Suraya, Montassar Tabben, Khaled Trabelsi, Axel Urhausen, Maarit Valtonen, Johanna Weber, Rodney Whiteley, Adel Zrane, Yacine Zerguini, Piotr Zmijewski, Øyvind Sandbakk, Helmi Ben Saad, and Karim Chamari
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Physical Therapy, Sports Therapy and Rehabilitation ,Orthopedics and Sports Medicine - Published
- 2022
12. Caffeine Use or Napping to Enhance Repeated Sprint Performance After Partial Sleep Deprivation: Why Not Both?
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Tarak Driss, Nizar Souissi, Karim Chamari, Kacem Mahdouani, Imen Moussa-Chamari, Yassine Chaabouni, Zouheir Sahnoun, Mohamed Romdhani, and Omar Hammouda
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Male ,medicine.medical_specialty ,Physical Therapy, Sports Therapy and Rehabilitation ,Athletic Performance ,Placebo ,chemistry.chemical_compound ,Double-Blind Method ,Caffeine ,Internal medicine ,medicine ,Humans ,Orthopedics and Sports Medicine ,Sleep restriction ,biology ,business.industry ,Nap ,Sleep deprivation ,Endocrinology ,Sprint ,chemistry ,Athletes ,biology.protein ,Sleep Deprivation ,Creatine kinase ,medicine.symptom ,Sleep ,business ,Anaerobic exercise - Abstract
Purpose: To compare the effect of a 20-minute nap opportunity (N20), a moderate dose of caffeine (CAF; 5 mg·kg−1), or a moderate dose of caffeine before N20 (CAF+N) as possible countermeasures to the decreased performance and the partial sleep deprivation–induced muscle damage. Methods: Nine male, highly trained judokas were randomly assigned to either baseline normal sleep night, placebo, N20, CAF, or CAF+N. Test sessions included the running-based anaerobic sprint test, from which the maximum (Pmax), mean (Pmean), and minimum (Pmin) powers were calculated. Biomarkers of muscle, hepatic, and cardiac damage and of enzymatic and nonenzymatic antioxidants were measured at rest and after the exercise. Results: N20 increased Pmax compared with placebo (P d = 0.75). CAF+N increased Pmax (P d = 1.5; d = 0.94), Pmin (P d = 2.79; d = 2.6), and Pmean (P d = 1.93; d = 1.79) compared with placebo and CAF, respectively. Postexercise creatine kinase increased whenever caffeine was added, that is, after CAF (P d = 1.19) and CAF+N (P d = 1.36). Postexercise uric acid increased whenever participants napped, that is, after N20 (P d = 2.19) and CAF+N (P d = 2.50) and decreased after CAF (P d = 2.96). Conclusion: Napping improved repeated-sprint performance and antioxidant defense after partial sleep deprivation. Contrarily, caffeine increased muscle damage without improving performance. For sleep-deprived athletes, caffeine before a short nap opportunity would be more beneficial for repeated sprint performance than each treatment alone.
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- 2021
13. The effect of post-lunch napping on mood, reaction time, and antioxidant defense during repeated sprint exercice
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Omar Hammouda, Ismail Dergaa, Tarak Driss, Yassine Chaabouni, Nizar Souissi, Mohamed Romdhani, Kacem Mahdouani, Karim Chamari, Olfa Abene, Imen Moussa-Chamari, and Moussa Chamari, Imen
- Subjects
Biomarkers of Muscle Damage ,medicine.medical_specialty ,Original Paper ,Antioxidant ,Short-term Exercise ,medicine.medical_treatment ,musculoskeletal, neural, and ocular physiology ,Antioxidant Status ,Cognitive Performance ,Physical Therapy, Sports Therapy and Rehabilitation ,[SCCO] Cognitive science ,Ergogenic aid ,Mood ,Sprint ,Midday sleep ,Physiology (medical) ,mental disorders ,medicine ,Physical therapy ,Orthopedics and Sports Medicine ,Effects of sleep deprivation on cognitive performance ,[SHS] Humanities and Social Sciences ,Psychology ,human activities - Abstract
To compare the effects of two nap opportunities (20 and 90 min) to countermeasure the transient naturally occurring increased sleepiness and decreased performances during the post-lunch dip (PLD). Fourteen highly trained judokas completed in a counterbalanced and randomized order three test sessions (control (No-nap), 20- (N20) and 90-min (N90) nap opportunities). Test sessions consisted of the running-based anaerobic sprint test (RAST), simple and multiple-choice reaction times (MCRT) and the Epworth sleepiness scale (ESS). From the RAST, the maximum (Pmax), mean (Pmean) and minimum (Pmin) powers were calculated. Blood samples were taken before and after the RAST to measure the effect of pre-exercise napping on energetic and muscle damage biomarkers and antioxidant defense. N20 increased Pmax and Pmean compared to No-nap (p < 0.001, d = 0.59; d = 0.66) and N90 (p < 0.001, d = 0.98; d = 0.72), respectively. Besides, plasma lactate and creatinine increased only when the exercise was performed after N20. Both N20 (p < 0.001, d = 1.18) and N90 (p < 0.01, d = 0.78) enhanced post-exercise superoxide dismutase activity compared to No-nap. However, only N20 enhanced post-exercise glutathione peroxidase activity (p < 0.001, d = 1.01) compared to pre-nap. Further, MCRT performance was higher after N20 compared to No-nap and N90 (p < 0.001, d = 1.15; d = 0.81, respectively). Subjective sleepiness was lower after N20 compared to No-nap (p < 0.05, d = 0.92) and N90 (p < 0.01, d = 0.89). The opportunity to nap for 20 min in the PLD enhanced RAST, MCRT performances, and antioxidant defense, and decreased sleepiness. However, the opportunity of 90 min nap was associated with decreased repeated sprint performances and increased sleepiness, probably because of the sleep inertia.
- Published
- 2021
14. Associations between bio‑motor ability, endocrine markers and hand‑specific anthropometrics in elite female futsal players: a pilot study
- Author
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Farid, Farhani, Hamid, Arazi, Mohammad, Mirzaei, Hadi, Nobari, Elena, Mainer-Pardos, Imen Moussa, Chamari, Julien S, Baker, Jorge, Pérez-Gómez, and Karim, Chamari
- Subjects
Talent ,Digit ratio ,Power ,Performance ,Rehabilitation ,Football ,Physical Therapy, Sports Therapy and Rehabilitation ,Orthopedics and Sports Medicine ,Skill ,Hormone - Abstract
Background The second-to-fourth digit ratio (2D:4D) has been calculated for individual athletes and sports, but it has not been investigated in futsal performance. Therefore, the aim of this study was to investigate any relationships between 2D:4D of the dominant and non-dominant hands and physical capacity performances, selected functional variables and hormone concentrations in elite female futsal players. Methods Twenty-four elite female futsal players were measured for 2D:4D in the dominant (2D:4DD) and non-dominant (2D:4DND) hand. The futsal specific performance test (FSPT), hand-grip strength (HGS) and aerobic power were also assessed. In addition, selected circulatory hormones were measured (estradiol, cortisol, growth hormone and insulin like growth factor-1). Pearson’s correlation test was used to identify correlational relationships. Results Total test-time and performance time (total time + penalty time) for the FSPT showed a significant correlation with 2D:4DD (r = 0.53, p = 0.005 and r = 0.55, p = 0.003, respectively). HGSND also displayed a significant correlation with the 2D:4DD (r = 0.59, p = 0.002). Aerobic power and time spent running on the treadmill also showed a significant relationship with 2D:4DND (both, r = 0.54, p = 0.006). Cortisol showed a significant correlation with 2D:4DD (− 0.58, p = 0.003) and 2D:4DND(− 0.52, p = 0.008). Conclusions The measurement of 2D:4D ratio could be an important factor in determining potential performance attributes and talent identification of elite female futsal players. Further studies are needed in this area to further examine the results presented here.
- Published
- 2022
15. Appropriate interpretation of aerobic capacity: allometric scaling in adult and young soccer players
- Author
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L Boussaïdi, Ulrik Wisløff, F Kaouech, Imen Moussa-Chamari, Karim Chamari, and Younés Hachana
- Subjects
Adult ,Male ,medicine.medical_specialty ,Adolescent ,Anaerobic Threshold ,Physical Therapy, Sports Therapy and Rehabilitation ,Running ,Oxygen Consumption ,Animal science ,Soccer ,medicine ,Humans ,Orthopedics and Sports Medicine ,Lactic Acid ,Training programme ,Aerobic capacity ,Mathematics ,General Medicine ,Oxygen uptake ,Exercise Test ,Lean body mass ,Running economy ,Energy cost ,Physical therapy ,Original Article ,Allometry ,human activities ,Anaerobic exercise - Abstract
Objective: To compare aerobic capacity of young and adult elite soccer players using appropriate scaling procedures. Methods: Twenty four male adult (mean (SD) age 24 (2) years, weight 75.7 (7.2) kg, VO2MAX 66.6 (5.2) ml/lbm/min, where lbm is lean body mass in kg) and 21 youth (14 (0.4) years, 60.2 (7.3) kg, 66.5 (5.9) ml/lbm/min) elite soccer players took part in the study. Allometric equations were used to determine the relation between maximal and submaximal oxygen cost of running (running economy) and body mass. Results: Maximal and submaximal oxygen uptake increased in proportion to body mass raised to the power of 0.72 (0.04) and 0.60 (0.06) respectively. The VO2MAX of adult players was similar to that of the youth players when expressed in direct proportion to body mass—that is, ml/kg/min—but 5% higher (p
- Published
- 2005
16. Endurance training and testing with the ball in young elite soccer players
- Author
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F Kaouech, Ulrik Wisløff, Karim Chamari, R Jeddi, Imen Moussa-Chamari, and Younés Hachana
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Male ,medicine.medical_specialty ,Adolescent ,Anaerobic Threshold ,Physical fitness ,Physical Therapy, Sports Therapy and Rehabilitation ,Oxygen Consumption ,Heart Rate ,Endurance training ,Soccer ,Task Performance and Analysis ,medicine ,Humans ,Orthopedics and Sports Medicine ,Lactic Acid ,Exercise physiology ,Exercise ,Aerobic capacity ,Training period ,Mathematics ,Physical Education and Training ,business.industry ,VO2 max ,General Medicine ,Respiratory Function Tests ,Physical Fitness ,Exercise Test ,Physical Endurance ,Physical therapy ,Running economy ,Regression Analysis ,Original Article ,business ,human activities ,Anaerobic exercise - Abstract
Background: The aerobic capacity of soccer players substantially influences their technical performance and tactical choices. Thus, the assessment of soccer players’ aerobic performance should be of interest for soccer coaches in order to evaluate and improve their endurance training sessions. In this study, we present a new test to assess aerobic performance in soccer by means of a specific dribbling track: the Hoff test. We further determined whether improvement in maximal oxygen uptake was reflected in increased distance covered in the Hoff test. Methods: We tested 18 male soccer players (14 years old) both in the laboratory and using the Hoff test before and after 8 weeks of soccer training. Results: The distance covered in the Hoff test correlated significantly with maximum oxygen uptake, and improved by 9.6% during the 8 week training period, while maximum oxygen uptake and running economy improved by 12 and 10%, respectively. Backward multiple regression showed maximum oxygen uptake to be the main explanatory variable for the distance covered in the Hoff test. Conclusion: The present study demonstrated a significant correlation between laboratory testing of VO 2max and performance in the Hoff test. Furthermore, training induced improvements in VO 2max were reflected in improved performance in the Hoff test. We suggest that it should be a goal for active U-15 soccer players to cover more than 2100 metres in the Hoff test, as this requires a VO 2max of above 200 ml/kg 0.75 /min, which should serve as a minimum in modern soccer.
- Published
- 2005
17. Stretch and sprint training reduces stretch-induced sprint performance deficits in 13- to 15-year-old youth
- Author
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P. Wong, Karim Chamari, M Chaouachi, A. Chaouachi, Imen Moussa-Chamari, David G. Behm, and Carlo Castagna
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Acute effects ,Male ,medicine.medical_specialty ,Flexibility (anatomy) ,Time Factors ,Adolescent ,Physiology ,education ,Running ,Static stretching ,Physiology (medical) ,Muscle Stretching Exercises ,Task Performance and Analysis ,medicine ,Humans ,Orthopedics and Sports Medicine ,Range of Motion, Articular ,Muscle, Skeletal ,Exercise ,business.industry ,musculoskeletal, neural, and ocular physiology ,Public Health, Environmental and Occupational Health ,General Medicine ,Human physiology ,Sprint training ,medicine.anatomical_structure ,Sprint ,Physical therapy ,Female ,Joints ,Training program ,Range of motion ,business ,human activities - Abstract
The recently reported static stretching impairments found in adults have not been studied in youth. Furthermore, stretch-training effects on sprint performance are equivocal, hence the purpose of this study was to examine the effect of stretch and sprint training on the acute effects of static stretching in 13–15 year olds. A total of 48 students were randomly divided into a sprint only and a stretch and sprint training groups who performed static stretching at the beginning and middle of the speed training sessions (6 weeks). Flexibility tests and 30-m sprints were performed before and after training. Sprint performance was evaluated with and without prior stretching. A main effect indicated that prior static stretching impairs sprint times at 10 (P = 0.01) and 30 m (P = 0.0005). Both groups improved times over 10 (0.7%; P = 0.04) and 30-m (1.5%; P = 0.0007) sprint distance after training. Stretch and sprint trained participants were more resistant to stretch-induced sprint deficits with 3.2% (P < 0.0001), 3.6% (P = 0.0002) and 1.3% (P < 0.0001) faster times at 5, 10, and 30 m, respectively, than the sprint only group. In conclusion, a stretch and sprint training program in 13–15 year olds diminished the detrimental effects of static stretching compared to a sprint only training program.
- Published
- 2008
18. Correlation between heart rate and performance during Olympic windsurfing competition
- Author
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Imen Moussa-Chamari, Donia Koubaa, Olivier Galy, Chokri Ben Hassen, Olivier Hue, Karim Chamari, M Chaouachi, Unknown, User, Research Unit National Center of Medicine and Science in Sport (CNMSS), Research Unit National Center of Medicine and Science in Sport, Institut Supérieur du Sport et de l'Education Physique, Adaptations au Climat Tropical, Exercice et Santé (ACTES), and Université des Antilles et de la Guyane (UAG)
- Subjects
Adult ,Male ,Competitive Behavior ,[SDV.OT]Life Sciences [q-bio]/Other [q-bio.OT] ,Anaerobic Threshold ,Physical fitness ,Physical Exertion ,Statistics as Topic ,030204 cardiovascular system & hematology ,Correlation ,03 medical and health sciences ,0302 clinical medicine ,Animal science ,Oxygen Consumption ,Heart Rate ,Physiology (medical) ,Heart rate ,Task Performance and Analysis ,Medicine ,Humans ,Orthopedics and Sports Medicine ,Lactic Acid ,Treadmill ,Lactate concentration ,business.industry ,[SDV.OT] Life Sciences [q-bio]/Other [q-bio.OT] ,Public Health, Environmental and Occupational Health ,VO2 max ,030229 sport sciences ,General Medicine ,Female ,Maximal exercise ,Ventilatory threshold ,business ,Sports - Abstract
The aim of this study was to examine the heart rate (HR) response to Olympic windsurfing competition and to check if there was any correlation between racing HR, performance, and the variables measured during laboratory maximal exercise. Ten elite windsurfers [age: 20.93 (3.46) years; height: 178.10 (6.34) cm; body mass: 66.79 (5.90) kg] performed a laboratory maximal oxygen consumption (.VO(2max)) trial and national windsurf competitions wearing a HR monitor. One hundred and forty-three individual races were examined. Racing HR was expressed as a percentage of (1) HR(max) (maximal treadmill HR) and (2) HR(reserve) (HR(max)-HR(rest)). The performance (racing classification: RC, which is inversely proportional to performance) was significantly correlated to the racing HR response in both light wind (LW): LW-RC=-0.12(%HR(reserve))+13.03; r=-0.71, r(2)=0.50, p
- Published
- 2003
19. Associations between bio-motor ability, endocrine markers and hand-specific anthropometrics in elite female futsal players: a pilot study
- Author
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Farid Farhani, Hamid Arazi, Mohammad Mirzaei, Hadi Nobari, Elena Mainer-Pardos, Imen Moussa Chamari, Julien S. Baker, Jorge Pérez-Gómez, and Karim Chamari
- Subjects
Talent ,Football ,Digit ratio ,Hormone ,Skill ,Power ,Sports medicine ,RC1200-1245 - Abstract
Abstract Background The second-to-fourth digit ratio (2D:4D) has been calculated for individual athletes and sports, but it has not been investigated in futsal performance. Therefore, the aim of this study was to investigate any relationships between 2D:4D of the dominant and non-dominant hands and physical capacity performances, selected functional variables and hormone concentrations in elite female futsal players. Methods Twenty-four elite female futsal players were measured for 2D:4D in the dominant (2D:4DD) and non-dominant (2D:4DND) hand. The futsal specific performance test (FSPT), hand-grip strength (HGS) and aerobic power were also assessed. In addition, selected circulatory hormones were measured (estradiol, cortisol, growth hormone and insulin like growth factor-1). Pearson’s correlation test was used to identify correlational relationships. Results Total test-time and performance time (total time + penalty time) for the FSPT showed a significant correlation with 2D:4DD (r = 0.53, p = 0.005 and r = 0.55, p = 0.003, respectively). HGSND also displayed a significant correlation with the 2D:4DD (r = 0.59, p = 0.002). Aerobic power and time spent running on the treadmill also showed a significant relationship with 2D:4DND (both, r = 0.54, p = 0.006). Cortisol showed a significant correlation with 2D:4DD (− 0.58, p = 0.003) and 2D:4DND(− 0.52, p = 0.008). Conclusions The measurement of 2D:4D ratio could be an important factor in determining potential performance attributes and talent identification of elite female futsal players. Further studies are needed in this area to further examine the results presented here.
- Published
- 2022
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