Price Mike, Moss Paul, Rance Stuart
School of Science and the Environment, Coventry University, Coventry, United Kingdom.
Med Sci Sports Exerc. 2003 Aug;35(8):1303-8. doi: 10.1249/01.MSS.0000079067.46555.3C.
The aim of this study was to determine the effects of sodium bicarbonate ingestion on prolonged intermittent exercise and performance.
Eight healthy male subjects (mean +/- SD: age 25.4 +/- 6.4 yr, mass 70.9 +/- 5.1 kg, height 179 +/- 7 cm, VO(2max) 4.21 +/- 0.51 L.min-1) volunteered for the study, which had received ethical approval. Subjects undertook two 30-min intermittent cycling trials (repeated 3-min blocks; 90 s at 40% VO(2max), 60 s at 60% VO(2max), 14-s maximal sprint, 16-s rest) after ingestion of either sodium bicarbonate (NaHCO(3); 0.3 g.kg-1) or sodium chloride (NaCl; 0.045 g x kg(-1). Expired air, blood lactate (BLa), bicarbonate (HCO(3)-), and pH were measured at rest, 30 and 60 min postingestion, and during the 40% VO(2max) component of exercise (4, 10, 16, and 29 min).
After ingestion, pH increased from rest to 7.46 +/- 0.03 and 7.40 +/- 0.01 for NaHCO(3) and NaCl, respectively (main effect for time and trial; P < 0.05). Values decreased at 15 min of exercise to 7.30 +/- 0.07 and 7.21 +/- 0.06, respectively, remaining at similar levels until the end of exercise. BLa peaked at 15 min (12.03 +/- 4.31 and 10.00 +/- 2.58 mmol.L-1, for NaHCO(3) and NaCl, respectively; P > 0.05) remaining elevated until the end of exercise (P < 0.05). Peak power expressed relative to sprint 1 demonstrated a significant main effect between trials (P < 0.05). Sprint 2 increased by 11.5 +/- 5% and 1.8 +/- 9.5% for NaHCO(3) and NaCl, respectively. During NaHCO(3), sprint 8 remained similar to sprint 1 (0.2 +/- 17%), whereas a decrease was observed during NaCl (-10.0 +/- 16.0%).
The results of this study suggest that ingestion of NaHCO(3) improves sprint performance during prolonged intermittent cycling.
本研究旨在确定摄入碳酸氢钠对长时间间歇性运动及运动表现的影响。
八名健康男性受试者（平均±标准差：年龄25.4±6.4岁，体重70.9±5.1千克，身高179±7厘米，最大摄氧量4.21±0.51升·分钟⁻¹）自愿参与本研究，该研究已获得伦理批准。受试者在摄入碳酸氢钠（NaHCO₃；0.3克·千克⁻¹）或氯化钠（NaCl；0.045克·千克⁻¹）后进行两次30分钟的间歇性自行车试验（重复3分钟时段；40%最大摄氧量时运动90秒，60%最大摄氧量时运动60秒，14秒全力冲刺，16秒休息）。在静息状态、摄入后30分钟和60分钟以及运动40%最大摄氧量时段（4、10、16和29分钟）测量呼出气体、血乳酸（BLa）、碳酸氢盐（HCO₃⁻）和pH值。
摄入后，NaHCO₃组和NaCl组的pH值分别从静息时升至7.46±0.03和7.40±0.01（时间和试验的主效应；P<0.05）。运动15分钟时，pH值分别降至7.30±0.07和7.21±0.06，直至运动结束时保持在相似水平。BLa在15分钟时达到峰值（NaHCO₃组和NaCl组分别为12.03±4.31和10.00±2.58毫摩尔·升⁻¹；P>0.05），直至运动结束时一直保持升高（P<0.05）。相对于冲刺1的峰值功率在试验间显示出显著的主效应（P<0.05）。NaHCO₃组和NaCl组的冲刺2分别增加了11.5±5%和1.8±9.5%。在NaHCO₃组期间，冲刺8与冲刺1相似（0.2±17%）；而在NaCl组期间观察到下降（-10.0±16.0%）。
本研究结果表明，摄入NaHCO₃可改善长时间间歇性自行车运动中的冲刺表现。
