Mittleman K D, Ricci M R, Bailey S P
Department of Exercise Science, Rutgers University, New Brunswick, NJ 08903, USA. dwrite!
Med Sci Sports Exerc. 1998 Jan;30(1):83-91. doi: 10.1097/00005768-199801000-00012.
To assess the effect of branched-chain amino acids (BCAA) supplementation on endurance performance in the heat, six women and seven men participated in two trials of rest in the heat (Ta = 34.4 +/- 1.8 degrees C; rh = 39 +/- 14%), followed by 40% VO2peak exercise to exhaustion. Subjects ingested 5 mL x kg(-1) of a placebo (PLAC) or BCAA drink every 30 min. Cycle time to exhaustion increased during BCAA (153.1 +/- 13.3 vs 137.0 +/- 12.2 min, P < 0.05) for men and women. Plasma glucose was maintained at baseline values for both drinks; however, women had significantly higher concentrations (5.9 +/- 0.6 vs 4.0 +/- 0.2 mM, P < 0.05). Plasma free fatty acids and ammonia were not influenced by drink or gender but increased over time. BCAA resulted in a significant (P < 0.05) increase in plasma BCAA (1209 +/- 119 vs 496 +/- 44 microM), while F-TRP (9.6 +/- 0.9 vs 12.0 +/- 1.3 microM) and F-TRP:BCAA were decreased (0.009 +/- 0.001 vs 0.024 +/- 0.003 ND) in both men and women. Cardiovascular and thermoregulatory data were similar between treatments for all subjects. Psychological data were not influenced by BCAA. These results indicate BCAA supplementation prolongs moderate exercise performance in the heat.
为评估补充支链氨基酸（BCAA）对热环境下耐力表现的影响，6名女性和7名男性参与了两项热环境休息试验（Ta = 34.4±1.8摄氏度；rh = 39±14%），随后进行40%最大摄氧量（VO2peak）的运动直至力竭。受试者每30分钟摄入5 mL·kg-1的安慰剂（PLAC）或BCAA饮料。男性和女性在摄入BCAA期间至力竭的骑行时间均增加（153.1±13.3 vs 137.0±12.2分钟，P < 0.05）。两种饮料的血浆葡萄糖均维持在基线值；然而，女性的浓度显著更高（5.9±0.6 vs 4.0±0.2 mM，P < 0.05）。血浆游离脂肪酸和氨不受饮料或性别的影响，但随时间增加。BCAA导致血浆BCAA显著增加（P < 0.05）（1209±119 vs 496±44 μM），而男性和女性的游离色氨酸（F-TRP）（9.6±0.9 vs 12.0±1.3 μM）以及F-TRP:BCAA均降低（0.009±0.001 vs 0.024±0.003，无差异）。所有受试者在不同处理之间的心血管和体温调节数据相似。心理数据不受BCAA影响。这些结果表明补充BCAA可延长热环境下的中等强度运动表现。
