Greenhaff P L, Gleeson M, Maughan R J
Eur J Appl Physiol Occup Physiol. 1987;56(3):331-7. doi: 10.1007/BF00690901.
The effect of a pattern of exercise and dietary modification, which is normally used to alter muscle glycogen content, upon the acid-base status of the blood and the ability to perform high intensity exercise was studied. Eleven healthy male subjects cycled to exhaustion on an electrically braked cycle ergometer at a workload equivalent to 100% of their maximal oxygen uptake (VO2max) on three separate occasions. The first exercise test took place after a normal diet (46.2 +/- 6.7% carbohydrate (CHO)), and was followed by prolonged exercise to exhaustion to deplete muscle glycogen stores. The second test was performed after three days of a low carbohydrate diet (10.1 +/- 6.8% CHO) and subsequently after three days of a high CHO diet (65.5 +/- 9.8% CHO) the final test took place. Acid-base status and selected metabolites were measured on arterialised venous blood at rest prior to exercise and during the post-exercise period. Exercise time to exhaustion was longer after the normal (p less than 0.05) and high (p less than 0.05). CHO dietary phases compared with the low CHO phase. Resting pre-exercise pH was higher after the high CHO diet (p less than 0.05) compared with the low CHO diet. Pre-exercise bicarbonate, PCO2 and base excess measurements were higher after the high CHO treatment compared with both the normal (p less than 0.01, p less than 0.05, p less than 0.01 respectively) and low CHO phases (p less than 0.001, p less than 0.01, p less than 0.001 respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
研究了通常用于改变肌肉糖原含量的运动和饮食调整模式对血液酸碱状态及进行高强度运动能力的影响。11名健康男性受试者在电动刹车的自行车测力计上进行三次单独的运动测试，直至力竭，运动强度相当于其最大摄氧量（VO2max）的100%。第一次运动测试在正常饮食（碳水化合物含量为46.2±6.7%）后进行，随后进行长时间运动至力竭以耗尽肌肉糖原储备。第二次测试在低碳水化合物饮食（碳水化合物含量为10.1±6.8%）三天后进行，最后一次测试在高碳水化合物饮食（碳水化合物含量为65.5±9.8%）三天后进行。在运动前休息时以及运动后阶段，对动脉化静脉血中的酸碱状态和选定代谢物进行测量。与低碳水化合物阶段相比，正常碳水化合物阶段（p<0.05）和高碳水化合物阶段（p<0.05）运动至力竭的时间更长。与低碳水化合物饮食相比，高碳水化合物饮食后运动前休息时的pH值更高（p<0.05）。与正常碳水化合物阶段（分别为p<0.01、p<0.05、p<0.01）和低碳水化合物阶段（分别为p<0.001、p<0.01、p<0.001）相比，高碳水化合物处理后运动前的碳酸氢盐、PCO2和碱剩余测量值更高。（摘要截断于250字）
