Browsing Physical Education by Author "Chamari, Karim"
Now showing items 1-11 of 11
-
Caffeine use or napping to enhance repeated sprint performance after partial sleep deprivation: Why not both?
Romdhani, Mohamed; Souissi, Nizar; Moussa-Chamari, Imen; Chaabouni, Yassine; Mahdouani, Kacem; Sahnoun, Zouheir; Driss, Tarak; Chamari, Karim; Hammouda, Omar... more authors ... less authors ( Human Kinetics Publishers Inc. , 2021 , Article)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 ... -
COVID-19 Lockdowns: A Worldwide Survey of Circadian Rhythms and Sleep Quality in 3911 Athletes from 49 Countries, with Data-Driven Recommendations
Romdhani, Mohamed; Rae, Dale E.; Nédélec, Mathieu; Ammar, Achraf; Chtourou, Hamdi; Al Horani, Ramzi; Ben Saad, Helmi; Bragazzi, Nicola; Dönmez, Gürhan; Driss, Tarak; Fullagar, Hugh H.K.; Farooq, Abdulaziz; Garbarino, Sergio; Hammouda, Omar; Hassanmirzaei, Bahar; Khalladi, Karim; Khemila, Syrine; Mataruna-Dos-Santos, Leonardo Jose; Moussa-Chamari, Imen; Mujika, Iñigo; Muñoz Helú, Hussein; Norouzi Fashkhami, Amin; Paineiras-Domingos, Laisa Liane; Rahbari Khaneghah, Mehrshad; Saita, Yoshitomo; Trabelsi, Khaled; Vitale, Jacopo Antonino; Washif, Jad Adrian; Weber, Johanna; Souissi, Nizar; Taylor, Lee; Chamari, Karim... more authors ... less authors ( Springer Nature , 2021 , Article)Objective: In a convenience sample of athletes, we conducted a survey of COVID-19-mediated lockdown (termed ‘lockdown’ from this point forward) effects on: (i) circadian rhythms; (ii) sleep; (iii) eating; and (iv) training ... -
The effect of caffeine, nap opportunity and their combination on biomarkers of muscle damage and antioxidant defence during repeated sprint exercise
Romdhani, Mohamed; Souissi, Nizar; Dergaa, Ismail; Moussa-Chamari, Imen; Chaabouni, Yassine; Mahdouani, Kacem; Abene, Olfa; Driss, Tarak; Chamari, Karim; Hammouda, Omar... more authors ... less authors ( Institute of Sport , 2021 , Article)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) ... -
The Effect of Experimental Recuperative and Appetitive Post-lunch Nap Opportunities, With or Without Caffeine, on Mood and Reaction Time in Highly Trained Athletes
Romdhani, Mohamed; Souissi, Nizar; Dergaa, Ismael; Moussa-Chamari, Imen; Abene, Olfa; Chtourou, Hamdi; Sahnoun, Zouheir; Driss, Tarak; Chamari, Karim; Hammouda, Omar... more authors ... less authors ( Frontiers Media S.A. , 2021 , Article)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; ... -
The effect of post-lunch napping on mood, reaction time, and antioxidant defense during repeated sprint exercice
Romdhani, Mohamed; Dergaa, Ismail; Moussa-Chamari, Imen; Souissi, Nizar; Chaabouni, Yassine; Mahdouani, Kacem; Abene, Olfa; Driss, Tarak; Chamari, Karim; Hammouda, Omar... more authors ... less authors ( Institute of Sport , 2021 , Article)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 ... -
Effect of tethered swimming as postactivation potentiation on swimming performance and technical, hemophysiological, and psychophysiological variables in adolescent swimmers
Abbes, Zied; Haddad, Monoem; Bibi, Khalid W.; Mujika, Iñigo; Martin, Cyril; Chamari, Karim... more authors ... less authors ( Human Kinetics Publishers Inc. , 2021 , Article)Objectives: To investigate whether tethered swimming (TS) performed 8 minutes before a 50-m freestyle swimming sprint could be an effective postactivation potentiation method to improve performance in young swimmers. ... -
Heat Adaptation and Nutrition Practices: Athlete and Practitioner Knowledge and Use
Alabdulwahed, Salma; Galán-López, Natalia; Hill, Tom; James, Lewis J.; Chrismas, Bryna Catherine Rose; Racinais, Sebastien; Stellingwerff, Trent; Leal, Diogo V.; Hausen, Matheus; Chamari, Karim; Fullagar, Hugh H.K.; Esh, Christopher; Taylor, Lee... more authors ... less authors ( Human Kinetics Publishers Inc. , 2022 , Article)Purpose: To survey elite athletes and practitioners to identify (1) knowledge and application of heat acclimation/acclimatization (HA) interventions, (2) barriers to HA application, and (3) nutritional practices supporting ... -
Impact of covid‐19 on swimming training: Practical recommendations during home confinement/isolation
Haddad, Monoem; Abbes, Zied; Mujika, Iñigo; Chamari, Karim ( Multidisciplinary Digital Publishing Institute (MDPI) , 2021 , Article)The COVID‐19 pandemic has had severe effects on communities globally, leading to significant restrictions on all aspects of society, including in sports. Several significant decisions were made to postpone or cancel major ... -
Lockdown Duration and Training Intensity Affect Sleep Behavior in an International Sample of 1,454 Elite Athletes
Romdhani, Mohamed; Fullagar, Hugh H.K.; Vitale, Jacopo A.; Nédélec, Mathieu; Rae, Dale E.; Ammar, Achraf; Chtourou, Hamdi; Al Horani, Ramzi A.; Ben Saad, Helmi; Bragazzi, Nicola Luigi; Dönmez, Gürhan; Dergaa, Ismail; Driss, Tarak; Farooq, Abdulaziz; Hammouda, Omar; Harroum, Nesrine; Hassanmirzaei, Bahar; Khalladi, Karim; Khemila, Syrine; Mataruna-Dos-Santos, Leonardo Jose; Moussa-Chamari, Imen; Mujika, Iñigo; Muñoz Helú, Hussein; Norouzi Fashkhami, Amin; Paineiras-Domingos, Laisa Liane; Khaneghah, Mehrshad Rahbari; Saita, Yoshitomo; Souissi, Nizar; Trabelsi, Khaled; Washif, Jad Adrian; Weber, Johanna; Zmijewski, Piotr; Taylor, Lee; Garbarino, Sergio; Chamari, Karim... more authors ... less authors ( Frontiers Media S.A. , 2022 , Article)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 ... -
Ramadan Observance Exacerbated the Negative Effects of COVID-19 Lockdown on Sleep and Training Behaviors: A International Survey on 1,681 Muslim Athletes
Romdhani, Mohamed; Ammar, Achraf; Trabelsi, Khaled; Chtourou, Hamdi; Vitale, Jacopo A.; Masmoudi, Liwa; Nédélec, Mathieu; Rae, Dale E.; Al Horani, Ramzi A.; Ben Saad, Helmi; Bragazzi, Nicola; Dönmez, Gürhan; Dergaa, Ismail; Driss, Tarak; Farooq, Abdulaziz; Hammouda, Omar; Harroum, Nesrine; Hassanmirzaei, Bahar; Khalladi, Karim; Khemila, Syrine; Mataruna-Dos-Santos, Leonardo Jose; Moussa-Chamari, Imen; Mujika, Iñigo; Muñoz Helú, Hussein; Norouzi Fashkhami, Amin; Paineiras-Domingos, Laisa Liane; Khaneghah, Mehrshad Rahbari; Saita, Yoshitomo; Souabni, Maher; Souissi, Nizar; Washif, Jad Adrian; Weber, Johanna; Zmijewski, Piotr; Taylor, Lee; Garbarino, Sergio; Chamari, Karim... more authors ... less authors ( Frontiers Media S.A. , 2022 , Article)Objective: Disrupted 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 ... -
The Use of Recovery Strategies in Professional Soccer: A Worldwide Survey
Field, Adam; Harper, Liam D.; Chrismas, Bryna C.R.; Fowler, Peter M.; McCall, Alan; Paul, Darren J.; Chamari, Karim; Taylor, Lee... more authors ... less authors ( Human Kinetics Publishers Inc. , 2021 , Article)Purpose: To survey soccer practitioners’ recovery strategy: (1) use, (2) perceived effectiveness, and (3) factors influencing their implementation in professional soccer. Methods: A cross-sectional convenience sample of ...