Sport and Exercise Science, University of Central Florida, 4000 Central Florida Blvd, Orlando, Florida 32816, USA.
J Int Soc Sports Nutr. 2012 Mar 7;9(1):4. doi: 10.1186/1550-2783-9-4.
The purpose of this study was to examine the efficacy of L-alanyl-L-glutamine (AG) ingestion on basketball performance, including jump power, reaction time, shooting accuracy and fatigue.
Ten women (21.2 ± 1.6 years; height: 177.8 ± 8.7 cm; body mass: 73.5 ± 8.0 kg), all scholarship NCAA Division I basketball players, volunteered for this study. Subjects participated in four trials, each consisting of a 40-min basketball game with controlled time-outs for rehydration. During the first trial (DHY) subjects were not allowed to rehydrate, and the total weight lost during the contest was used to determine fluid replenishment during the subsequent three trials. During one trial subjects consumed only water (W), while during the other two trials subjects consumed the AG supplement mixed in water using either a low dose (1 g per 500 ml) (AG1) or high dose (2 g per 500 ml) (AG2) concentration. All data assessed prior to and following each game were converted into a Δ score (Post results - Pre results). All performance data were then analyzed using a one-way repeated measures analysis of variance.
During DHY subjects lost 1.72 ± 0.42 kg (2.3%) of their body mass. No differences in fluid intake (1.55 ± 0.43 L) were seen between rehydration trials. A 12.5% (p = 0.016) difference in basketball shooting performance was noted between DHY and AG1 and an 11.1% (p = 0.029) difference was seen between AG1 and W. Visual reaction time was significantly greater following AG1 (p = 0.014) compared to DHY. Differences (p = 0.045) in fatigue, as determined by player loads, were seen only between AG2 and DHY. No differences were seen in peak or mean vertical jump power during any trial.
Rehydration with AG appears to maintain basketball skill performance and visual reaction time to a greater extent than water only.
本研究旨在考察 L-丙氨酰-L-谷氨酰胺（AG）摄入对篮球表现的影响，包括跳跃力、反应时间、投篮准确性和疲劳。
10 名女性（21.2±1.6 岁；身高：177.8±8.7cm；体重：73.5±8.0kg），均为 NCAA 一级奖学金篮球运动员，自愿参加本研究。受试者参加了四项试验，每项试验均包括 40 分钟的篮球比赛，并有控制的补水休息时间。在第一次试验（DHY）中，受试者不允许补水，比赛中损失的总重量用于确定随后三次试验中的补液量。在一次试验中，受试者仅饮用清水（W），而在另外两次试验中，受试者饮用 AG 补充剂与清水混合，使用低剂量（1g 每 500ml）（AG1）或高剂量（2g 每 500ml）（AG2）浓度。每次比赛前后评估的所有数据均转换为Δ分数（Post results-Pre results）。然后使用单向重复测量方差分析对所有表现数据进行分析。
在 DHY 中，受试者体重损失了 1.72±0.42kg（2.3%）。在补液试验中，液体摄入量（1.55±0.43L）没有差异。DHY 和 AG1 之间的篮球投篮表现有 12.5%（p=0.016）的差异，AG1 和 W 之间有 11.1%（p=0.029）的差异。视觉反应时间在 AG1 后显著增加（p=0.014）与 DHY 相比。仅在 AG2 和 DHY 之间观察到疲劳（由球员负荷确定）的差异（p=0.045）。在任何试验中，垂直跳跃力的峰值或平均峰值均无差异。
与仅饮水相比，AG 补液似乎更能维持篮球技能表现和视觉反应时间。
