Laboratory of Applied Nutrition and Metabolism, School of Physical Education and Sport, University of Sao Paulo, Brazil.
Amino Acids. 2013 Aug;45(2):309-17. doi: 10.1007/s00726-013-1495-z. Epub 2013 Apr 18.
We examined the isolated and combined effects of beta-alanine (BA) and sodium bicarbonate (SB) on high-intensity intermittent upper-body performance in judo and jiu-jitsu competitors. 37 athletes were assigned to one of four groups: (1) placebo (PL)+PL; (2) BA+PL; (3) PL+SB or (4) BA+SB. BA or dextrose (placebo) (6.4 g day⁻¹) was ingested for 4 weeks and 500 mg kg⁻¹ BM of SB or calcium carbonate (placebo) was ingested for 7 days during the 4th week. Before and after 4 weeks of supplementation, the athletes completed four 30-s upper-body Wingate tests, separated by 3 min. Blood lactate was determined at rest, immediately after and 5 min after the 4th exercise bout, with perceived exertion reported immediately after the 4th bout. BA and SB alone increased the total work done in +7 and 8 %, respectively. The co-ingestion resulted in an additive effect (+14 %, p < 0.05 vs. BA and SB alone). BA alone significantly improved mean power in the 2nd and 3rd bouts and tended to improve the 4th bout. SB alone significantly improved mean power in the 4th bout and tended to improve in the 2nd and 3rd bouts. BA+SB enhanced mean power in all four bouts. PL+PL did not elicit any alteration on mean and peak power. Post-exercise blood lactate increased with all treatments except with PL+PL. Only BA+SB resulted in lower ratings of perceived exertion (p = 0.05). Chronic BA and SB supplementation alone equally enhanced high-intensity intermittent upper-body performance in well-trained athletes. Combined BA and SB promoted a clear additive ergogenic effect.
我们研究了β-丙氨酸（BA）和碳酸氢钠（SB）单独和联合对柔道和柔术运动员高强度间歇性上半身表现的影响。37 名运动员被分配到以下四个组之一：（1）安慰剂（PL）+PL；（2）BA+PL；（3）PL+SB 或（4）BA+SB。BA 或右旋糖（安慰剂）（6.4 g·天⁻¹）连续摄入 4 周，第 4 周期间，500 mg·kg⁻¹·BM 的 SB 或碳酸钙（安慰剂）摄入 7 天。在补充 4 周前后，运动员完成了 4 次 30 秒的上半身 Wingate 测试，每次测试之间间隔 3 分钟。在第 4 次运动回合前、后即刻和 5 分钟时测定血乳酸，第 4 次回合后即刻报告主观感觉用力程度。BA 和 SB 单独使用可使总做功分别增加 7%和 8%。联合使用产生了累加效应（+14%，与 BA 和 SB 单独使用相比，p < 0.05）。BA 单独使用可显著提高第 2 和第 3 次回合的平均功率，且有改善第 4 次回合的趋势。SB 单独使用可显著提高第 4 次回合的平均功率，且有改善第 2 和第 3 次回合的趋势。BA+SB 可增强所有 4 次回合的平均功率。PL+PL 对平均和峰值功率没有任何影响。除 PL+PL 外，所有治疗方法均导致运动后血乳酸增加。只有 BA+SB 导致主观感觉用力程度评分降低（p = 0.05）。慢性 BA 和 SB 单独补充均可增强训练有素运动员的高强度间歇性上半身表现。BA 和 SB 联合使用可产生明显的增效作用。
