Hoffman Jay R, Ratamess Nicholas A, Faigenbaum Avery D, Ross Ryan, Kang Jie, Stout Jeffrey R, Wise John A
Department of Health and Exercise Science, The College of New Jersey, PO Box 7718, Ewing, NJ 08628, USA.
Nutr Res. 2008 Jan;28(1):31-5. doi: 10.1016/j.nutres.2007.11.004.
The purpose of this study was to examine the effect of 30 days of beta-alanine supplementation in collegiate football players on anaerobic performance measures. Subjects were randomly divided into a supplement (beta-alanine group [BA], 4.5 g x d(-1) of beta-alanine) or placebo (placebo group [P], 4.5 g x d(-1) of maltodextrin) group. Supplementation began 3 weeks before preseason football training camp and continued for an additional 9 days during camp. Performance measures included a 60-second Wingate anaerobic power test and 3 line drills (200-yd shuttle runs with a 2-minute rest between sprints) assessed on day 1 of training camp. Training logs recorded resistance training volumes, and subjects completed questionnaires on subjective feelings of soreness, fatigue, and practice intensity. No difference was seen in fatigue rate in the line drill, but a trend (P = .07) was observed for a lower fatigue rate for BA compared with P during the Wingate anaerobic power test. A significantly higher training volume was seen for BA in the bench press exercise, and a trend (P = .09) for a greater training volume was seen for all resistance exercise sessions. In addition, subjective feelings of fatigue were significantly lower for BA than P. In conclusion, despite a trend toward lower fatigue rates during 60 seconds of maximal exercise, 3 weeks of beta-alanine supplementation did not result in significant improvements in fatigue rates during high-intensity anaerobic exercise. However, higher training volumes and lower subjective feelings of fatigue in BA indicated that as duration of supplementation continued, the efficacy of beta-alanine supplementation in highly trained athletes became apparent.
本研究的目的是考察补充30天β-丙氨酸对大学生橄榄球运动员无氧运动能力指标的影响。受试者被随机分为补充组（β-丙氨酸组[BA]，每天补充4.5克β-丙氨酸）或安慰剂组（安慰剂组[P]，每天补充4.5克麦芽糊精）。补充在季前橄榄球训练营开始前3周开始，并在训练营期间持续额外的9天。运动能力指标包括在训练营第1天进行的60秒温盖特无氧功率测试和3次折返跑训练（200码穿梭跑，冲刺之间休息2分钟）。训练日志记录了抗阻训练量，受试者完成了关于酸痛、疲劳和训练强度主观感受的问卷调查。折返跑训练中的疲劳率没有差异，但在温盖特无氧功率测试中，观察到BA组的疲劳率低于P组的趋势（P = 0.07）。在卧推练习中，BA组的训练量显著更高，所有抗阻训练课次都有训练量更大的趋势（P = 0.09）。此外，BA组的疲劳主观感受显著低于P组。总之，尽管在60秒最大运动期间有疲劳率降低的趋势，但补充3周β-丙氨酸并没有导致高强度无氧运动期间疲劳率的显著改善。然而，BA组更高的训练量和更低的疲劳主观感受表明，随着补充时间的持续，β-丙氨酸补充对高水平运动员的功效变得明显。
