Sport, Health and Performance Enhancement (SHAPE) Research Group, School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK.
J Int Soc Sports Nutr. 2012 Aug 28;9(1):39. doi: 10.1186/1550-2783-9-39.
β-alanine supplementation has been shown to improve high-intensity exercise performance and capacity. However, the effects on intermittent exercise are less clear, with no effect shown on repeated sprint activity. The aim of this study was to investigate the effects of β-alanine supplementation on YoYo Intermittent Recovery Test Level 2 (YoYo IR2) performance.
Seventeen amateur footballers were allocated to either a placebo (PLA; N = 8) or β-alanine (BA; N = 9) supplementation group, and performed the YoYo IR2 on two separate occasions, pre and post 12 weeks of supplementation during a competitive season. Specifically, players were supplemented from early to mid-season (PLA: N = 5; BA: N = 6) or mid- to the end of the season (PLA: N = 3; BA: N = 3). Data were analysed using a two factor ANOVA with Tukey post-hoc analyses.
Pre supplementation scores were 1185 ± 216 and 1093 ± 148 m for PLA and BA, with no differences between groups (P = 0.41). YoYo performance was significantly improved for BA (+34.3%, P ≤ 0.001) but not PLA (-7.3%, P = 0.24) following supplementation. 2 of 8 (Early - Mid: 2 of 5; Mid - End: 0 of 3) players improved their YoYo scores in PLA (Range: -37.5 to + 14.7%) and 8 of 9 (Early - Mid: 6 of 6; Mid - End: 2 of 3) improved for BA (Range: +0.0 to +72.7%).
12 weeks of β-alanine supplementation improved YoYo IR2 performance, likely due to an increased muscle buffering capacity resulting in an attenuation of the reduction in intracellular pH during high-intensity intermittent exercise.
β-丙氨酸补充已被证明可以提高高强度运动表现和能力。然而，其对间歇性运动的影响尚不清楚，对重复冲刺活动没有影响。本研究旨在探讨 β-丙氨酸补充对 YoYo 间歇性恢复测试 2 级（YoYo IR2）表现的影响。
17 名业余足球运动员被分配到安慰剂（PLA；N = 8）或 β-丙氨酸（BA；N = 9）补充组，并在两个单独的场合进行 YoYo IR2 测试，分别在补充 12 周的竞争赛季前和后进行。具体来说，球员从赛季早期到中期（PLA：N = 5；BA：N = 6）或中期到赛季末（PLA：N = 3；BA：N = 3）进行补充。数据采用双因素方差分析和 Tukey 事后分析进行分析。
补充前 PLA 和 BA 的得分分别为 1185 ± 216 和 1093 ± 148 m，两组之间无差异（P = 0.41）。补充后，BA 的 YoYo 表现显著提高（+34.3%，P ≤ 0.001），而 PLA 则没有（-7.3%，P = 0.24）。PLA 中有 2 名（早期到中期：2 名/5 名；中期到末期：0 名/3 名）球员的 YoYo 得分提高，BA 中有 8 名（早期到中期：6 名/6 名；中期到末期：2 名/3 名）球员的得分提高（范围：+0.0 到+72.7%）。
12 周的 β-丙氨酸补充提高了 YoYo IR2 表现，这可能是由于肌肉缓冲能力的增加，导致高强度间歇性运动期间细胞内 pH 值的降低得到缓解。
