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Leucine supplementation does not improve muscle recovery from resistance exercise in young adults: A randomized, double-blinded, crossover study

Jacinto Jeferson L., Nunes João Pedro, Ribeiro Alex S., Casonatto Juliano, Roveratti Mirela C., Sena Bruna N. S., Cyrino Edilson S., da Silva Rubens Alexandre et Aguiar Andreo Fernando. (2021). Leucine supplementation does not improve muscle recovery from resistance exercise in young adults: A randomized, double-blinded, crossover study. International Journal of Exercise Science, 14, (2), p. 486-497.

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URL officielle: https://digitalcommons.wku.edu/ijes/vol14/iss2/8/

Résumé

This study aimed to investigate the effects of free leucine supplementation on muscle recovery from resistance exercise (RE) in young adults. Fourteen untrained subjects (23.9 ± 3.6 years old) underwent RE sessions (leg press and hack squat: three sets of 8-12 reps at 70% 1RM) supplemented with leucine (LEU: two daily doses of 3g) or a placebo (PLA), separated by a seven-day washout period. Following each occasion, participants were evaluated in three subsequent days (24h, 48h, and 72h) for muscle recovery via a repetition-to-failure test. The following markers were assessed: repetition performance, perceived exertion, lactate, creatine kinase, muscle soreness (DOMS), testosterone, and cortisol. No significant difference was observed between LEU and PLA conditions (p > 0.05). Number of repetitions performed in the repetition-to-failure tests, perceived exertion, cortisol, and testosterone:cortisol ratio did not change over time (p > 0.05). Creatine kinase increased immediately after exercise, at 24h, and 48h, and was attenuated at 72h post-exercise, while testosterone, lactate, and DOMS increased at 24h post-exercise (p < 0.05) and remained elevated up to 72h. All outcomes were similar between LEU and PLA. Results indicate that a 6g daily dose of free leucine supplementation does not improve muscle recovery following lower-limb RE in untrained young adults.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:14
Numéro:2
Pages:p. 486-497
Version évaluée par les pairs:Oui
Date:2021
Sujets:Sciences de la santé
Sciences de la santé > Sciences de l'activité physique et réadaptation
Sciences de la santé > Sciences de l'activité physique et réadaptation > Physiothérapie
Département, module, service et unité de recherche:Départements et modules > Département des sciences de la santé > Unité d'enseignement en physiothérapie
Mots-clés:Amino acids, BCAA, Branched-Chain Amino Acid, resistance training, muscle damage, acides aminés, acides aminés à chaine ramifiée, entraînement en résistance, dommages musculaires
Déposé le:26 oct. 2021 22:35
Dernière modification:26 oct. 2021 22:35
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Creative Commons LicenseSauf indication contraire, les documents archivés dans Constellation sont rendus disponibles selon les termes de la licence Creative Commons "Paternité, pas d'utilisation commerciale, pas de modification" 2.5 Canada.

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