Center of Research in Health Sciences, North University of Paraná (UNOPAR), Avenue Paris, 675, Jardim Piza, Londrina, PR, CEP: 86041-120, Brazil.
Département des Sciences de la Santé, Programme de Physiothérapie de L'université McGill Offert em Extension à L'UNIVERSITÉ du Québec à Chicoutimi (UQAC), 555 boul. De L'université, ville du Saguenay, Québec, QC, G7H 5B8, Canada.
Amino Acids. 2019 Apr;51(4):589-597. doi: 10.1007/s00726-018-02686-y. Epub 2019 Jan 9.
β-Alanine supplementation has been shown to increase muscle carnosine levels and exercise performance. However, its effects on muscle recovery from resistance exercise (RE) remains unknown. The purpose of this study was to investigate the effects of β-alanine supplementation on muscle function during recovery from a single session of high-intensity RE. Twenty-four untrained young adults (22.1 ± 4.6 years old) were assigned to one of two groups (N = 12 per group): a placebo-supplement group (4.8 g/day) or an β-alanine-supplement group (4.8 g/day). The groups completed a single session of high-intensity RE after 28 days of supplementation and were then evaluated for muscle function on the three subsequent days (at 24, 48, and 72 h postexercise) to assess the time course of muscle recovery. The following indicators of muscle recovery were assessed: number of repetitions until failure, rating of perceived exertion, muscle soreness, and blood levels of creatine kinase (CK). Number of repetitions until failure increased from 24 to 48 h and 72 h of recovery (time P < 0.01), with no difference between groups. There was a significant increase in the rating of perceived exertion among the sets during the RE session (time P < 0.01), with no difference between the groups. No difference was observed over time and between groups in rating of perceived exertion in the functional tests during recovery period. Blood CK levels and muscle soreness increased at 24 h postexercise and then progressively declined at 48 and 72 h postexercise, respectively (time P < 0.05), with no difference between groups. In conclusion, our data indicate that β-alanine supplementation does not improve muscle recovery following a high-intensity RE session in untrained young adults.
β-丙氨酸补充已被证明可以增加肌肉肌肽水平和运动表现。然而，其对抵抗运动（RE）后肌肉恢复的影响尚不清楚。本研究的目的是探讨β-丙氨酸补充对高强度 RE 单次训练后肌肉功能恢复的影响。24 名未经训练的年轻成年人（22.1±4.6 岁）被分配到两组中的一组（每组 12 人）：安慰剂补充组（4.8g/天）或β-丙氨酸补充组（4.8g/天）。两组在补充 28 天后完成了一次高强度 RE，然后在随后的三天（运动后 24、48 和 72 小时）评估肌肉功能，以评估肌肉恢复的时间过程。评估了以下肌肉恢复指标：直至失败的重复次数、感知用力等级、肌肉酸痛和血液肌酸激酶（CK）水平。直至失败的重复次数从 24 小时增加到 48 小时和 72 小时的恢复（时间 P<0.01），组间无差异。RE 期间各组的感知用力等级在一组中均显著增加（时间 P<0.01），组间无差异。在恢复期间的功能测试中，感知用力等级在时间和组间均无差异。运动后 24 小时血液 CK 水平和肌肉酸痛增加，随后分别在 48 和 72 小时逐渐下降（时间 P<0.05），组间无差异。总之，我们的数据表明，β-丙氨酸补充并不能改善未经训练的年轻成年人高强度 RE 后的肌肉恢复。
