Gao J P, Costill D L, Horswill C A, Park S H
Human Performance Laboratory, Ball State University, Muncie, IN 47306.
Eur J Appl Physiol Occup Physiol. 1988;58(1-2):171-4. doi: 10.1007/BF00636622.
In an effort to determine the effects of bicarbonate (NaHCO3) ingestion on exercise performance, ten male college swimmers were studied during five different trials. Each trial consisted of five 91.4 m (100-yd) front crawl swims with a two-minute rest interval between each bout. The trials consisted of two NaHCO3 treatments, two placebo trials and one test with no-drink. One hour before the onset of swimming, the subjects were given 300 ml of citric acid flavored solution containing either 17 mmol of NaCl (placebo) or 2.9 mmol of NaHCO3.kg-1 body weight (experimental), or received no drink (no-drink). Performance times for each 91.4 m swim were recorded. Blood samples were obtained before and one hr after treatment, two min after warmup, and two min after the final 91.4 m sprint. Blood pH, lactate, standard bicarbonate (SBC) and base excess (BE) were measured. No differences were found for performance or the blood measurements between the placebo and no-drink trials. Bicarbonate feedings, on the other hand, produced a significant (P less than 0.05) improvement in performance on the fourth and fifth swimming sprints. Blood lactate, pH, SBC and BE were significantly higher (P less than 0.05) at post-exercise in NaHCO3 treatments. These data are in agreement with previous findings that during repeated bouts of exercise pre-exercise administration of NaHCO3 improves performance, possibly by facilitating the efflux of hydrogen ions from working muscles and thereby delaying the onset of fatigue.
为了确定摄入碳酸氢钠（NaHCO₃）对运动表现的影响，对10名男性大学生游泳运动员进行了5种不同试验的研究。每次试验包括5次91.4米（100码）的自由泳，每次泳距之间有两分钟的休息间隔。试验包括两种碳酸氢钠处理、两次安慰剂试验和一次无饮料试验。在游泳开始前一小时，给受试者服用300毫升含有17毫摩尔氯化钠（安慰剂）或2.9毫摩尔NaHCO₃·kg⁻¹体重（实验组）的柠檬酸调味溶液，或者不给予饮料（无饮料试验）。记录每次91.4米游泳的成绩时间。在处理前、处理后一小时、热身两分钟后以及最后一次91.4米冲刺两分钟后采集血样。测量血液pH值、乳酸、标准碳酸氢盐（SBC）和碱剩余（BE）。在安慰剂试验和无饮料试验之间，运动表现或血液测量值没有差异。另一方面，摄入碳酸氢钠后，在第四次和第五次游泳冲刺时运动表现有显著（P＜0.05）改善。在碳酸氢钠处理组中，运动后血液乳酸、pH值、SBC和BE显著更高（P＜0.05）。这些数据与之前的研究结果一致，即在重复运动期间，运动前给予碳酸氢钠可能通过促进工作肌肉中氢离子的外流从而延迟疲劳的发生来提高运动表现。
