de Andrade Kratz Caroline, de Salles Painelli Vitor, de Andrade Nemezio Kleiner Márcio, da Silva Rafael Pires, Franchini Emerson, Zagatto Alessandro Moura, Gualano Bruno, Artioli Guilherme Giannini
Laboratory of Applied Nutrition and Metabolism, School of Physical Education and Sport, University of São Paulo, Brazil.
Laboratory of Applied Nutrition and Metabolism, School of Physical Education and Sport, University of São Paulo, Brazil.
J Sci Med Sport. 2017 Apr;20(4):403-408. doi: 10.1016/j.jsams.2016.08.014. Epub 2016 Aug 26.
In official judo competitions, athletes usually engage in 5-7 matches in the same day, performing numerous high-intensity efforts interspersed by short recovery intervals. Thus, glycolytic demand in judo is high and acidosis may limit performance. Carnosine is a relevant intracellular acid buffer whose content is increased with beta-alanine supplementation. Thus, we hypothesized that beta-alanine supplementation could attenuate acidosis and improve judo performance.
Twenty-three highly-trained judo athletes were randomly assigned to receive either beta-alanine (6.4gday) or placebo (dextrose, same dosage) for 4 weeks.
Performance was assessed before (PRE) and after (POST) supplementation through a 5-min simulated fight (randori) followed by 3 bouts of the Special Judo Fitness Test (SJFT). Blood samples were collected for blood pH, bicarbonate (HCO) and lactate determination.
Beta-alanine supplementation improved the number of throws per set and the total number of throws (both p<0.05). Placebo did not change these variables (both p>0.05). Blood pH and HCO reduced after exercise (all p<0.001), with no between-group differences (all p>0.05). However, the lactate response to exercise increased in the beta-alanine group as compared to placebo (p<0.05).
In conclusion, 4 weeks of beta-alanine supplementation effectively enhance judo-related performance in highly-trained athletes.
在官方柔道比赛中，运动员通常在同一天进行5至7场比赛，其间穿插着多次高强度的动作，并伴有短暂的恢复间隔。因此，柔道运动对糖酵解的需求很高，酸中毒可能会限制运动表现。肌肽是一种重要的细胞内酸性缓冲剂，其含量会随着β-丙氨酸的补充而增加。因此，我们推测补充β-丙氨酸可以减轻酸中毒并提高柔道运动表现。
23名训练有素的柔道运动员被随机分配，接受β-丙氨酸（6.4克/天）或安慰剂（葡萄糖，相同剂量），为期4周。
在补充前后，通过5分钟的模拟对抗赛（randori），随后进行3轮特殊柔道体能测试（SJFT）来评估运动表现。采集血样以测定血液pH值、碳酸氢盐（HCO）和乳酸含量。
补充β-丙氨酸提高了每组的投摔次数和总投摔次数（均p<0.05）。安慰剂组这些变量没有变化（均p>0.05）。运动后血液pH值和HCO降低（均p<0.001），组间无差异（均p>0.05）。然而，与安慰剂组相比，β-丙氨酸组运动后的乳酸反应增加（p<0.05）。
总之，4周的β-丙氨酸补充有效地提高了训练有素的运动员的柔道相关运动表现。
