Vandenberghe K, Hespel P, Vanden Eynde B, Lysens R, Richter E A
Faculty of Physical Education and Physiotherapy, Department of Kinesiology, Catholic University of Leuven, Belgium.
Med Sci Sports Exerc. 1995 Sep;27(9):1278-83.
This study examined the effect of glycogen supercompensation on glycogen breakdown, muscle and blood lactate accumulation, blood-pH, and performance during short-term high-intensity exercise. Young healthy volunteers performed two supramaximal (125% of VO2max) exercise tests on a bicycle ergometer, either for 1 min 45 s (protocol 1; N = 18) or to exhaustion (protocol 2; N = 14). The exercise tests were preceded by either 5 d on a controlled normal (N) diet, or by 2 d of glycogen-depleting exercise accompanied by the normal diet followed by 3 d on a carbohydrate-rich (CHR) diet. In protocol 1, preexercise muscle glycogen concentrations were 364 +/- 23 and 568 +/- 35 mumol.g-1 d.w. in the N and CHR condition, respectively (P < 0.05). During the exertion, glycogen concentration in the M. quadriceps decreased to the same extent in both groups. Accordingly, the exercise-induced increases in muscle and blood-lactate, and the fall in blood-pH were similar during N and CHR. In protocol 2, time to exhaustion was identical for N and CHR. It is concluded that during short-term intense exercise during which muscle glycogen availability exceeds glycogen demand, rate of glycogen breakdown, lactate accumulation, and performance are regulated irrespective of the preexercise muscle glycogen level.
本研究探讨了糖原超量补偿对短期高强度运动期间糖原分解、肌肉及血乳酸积累、血液pH值和运动表现的影响。年轻健康志愿者在自行车测力计上进行了两次超最大强度（最大摄氧量的125%）运动测试，一次持续1分45秒（方案1；N = 18），另一次直至力竭（方案2；N = 14）。运动测试前，受试者要么采用5天的对照正常（N）饮食，要么先进行2天糖原耗竭运动并搭配正常饮食，随后进行3天富含碳水化合物（CHR）的饮食。在方案1中，N组和CHR组运动前肌肉糖原浓度分别为364±23和568±35 μmol·g-1干重（P < 0.05）。运动过程中，两组股四头肌糖原浓度下降程度相同。因此，N组和CHR组运动诱导的肌肉和血乳酸增加以及血液pH值下降情况相似。在方案2中，N组和CHR组的力竭时间相同。得出的结论是，在短期剧烈运动期间，当肌肉糖原供应量超过糖原需求量时，无论运动前肌肉糖原水平如何，糖原分解速率、乳酸积累和运动表现均受到调节。
