Human Performance and Health Research Group, Centre for Life and Sport Sciences (CLaSS), Birmingham City University, Birmingham, B15 3TN, UK.
Centre for Sport, Exercise and Life Sciences, Coventry University, Coventry, CV1 2DS, UK.
Eur J Appl Physiol. 2023 Aug;123(8):1763-1771. doi: 10.1007/s00421-023-05192-6. Epub 2023 Apr 7.
The use of sodium bicarbonate (NaHCO) supplementation to improve repeated high-intensity performance is recommended; however, most swimming performance studies examine time trial efforts rather than repeated swims with interspersed recovery that are more indicative of training sessions. The aim of this study, therefore, was to investigate the effects of 0.3 g.kg BM NaHCO supplementation on sprint interval swimming (8 × 50 m) in regionally trained swimmers. Fourteen regionally competitive male swimmers (body mass (BM): 73 ± 8 kg) volunteered for this double-blind, randomised, crossover designed study. Each participant was asked to swim 8 × 50 m (front crawl) at a maximum intensity from a diving block, interspersed with 50 m active recovery swimming. After one familiarisation trial, this was repeated on two separate occasions whereby participants ingested either 0.3 g.kg BM NaHCO or 0.05 g.kg BM sodium chloride (placebo) in solution 60 min prior to exercise. Whilst there were no differences in time to complete between sprints 1-4 (p > 0.05), improvements were observed in sprint 5 (p = 0.011; ES = 0.26), 6 (p = 0.014; ES = 0.39), 7 (p = 0.005; ES = 0.60), and 8 (p = 0.004; ES = 0.79). Following NaHCO supplementation, pH was greater at 60 min (p < 0.001; ES = 3.09), whilst HCO was greater at 60 min (p < 0.001; ES = 3.23) and post-exercise (p = 0.016; ES = 0.53) compared to placebo. These findings suggest NaHCO supplementation can improve the latter stages of sprint interval swimming performance, which is likely due to the augmentation of pH and HCO prior to exercise and the subsequent increase in buffering capacity during exercise.
建议使用碳酸氢钠（NaHCO）补充剂来提高重复高强度表现；然而，大多数游泳表现研究检查计时赛努力，而不是更能指示训练课程的重复游泳和穿插恢复。因此，本研究的目的是调查 0.3 g.kg BM NaHCO 补充剂对区域训练游泳运动员的冲刺间隔游泳（8×50 m）的影响。14 名区域竞技男游泳运动员（体重（BM）：73±8 kg）自愿参加这项双盲、随机、交叉设计研究。每个参与者都被要求从跳板上以最大强度游 8×50 m（自由泳），每 50 m 穿插一次主动恢复游泳。在一次熟悉试验后，参与者在两次单独的场合下重复进行，其中参与者在运动前 60 分钟内以溶液形式摄入 0.3 g.kg BM NaHCO 或 0.05 g.kg BM 氯化钠（安慰剂）。虽然冲刺 1-4 之间的完成时间没有差异（p>0.05），但在冲刺 5（p=0.011；ES=0.26）、6（p=0.014；ES=0.39）、7（p=0.005；ES=0.60）和 8（p=0.004；ES=0.79）中观察到了改善。在补充 NaHCO 后，60 分钟时 pH 值更大（p<0.001；ES=3.09），而 HCO 在 60 分钟时更大（p<0.001；ES=3.23）和运动后（p=0.016；ES=0.53）与安慰剂相比。这些发现表明，NaHCO 补充剂可以提高冲刺间隔游泳表现的后期阶段，这可能是由于运动前 pH 值和 HCO 的增加以及运动期间缓冲能力的随后增加所致。
