Nishibata I, Sadamoto T, Mutoh Y, Miyashita M
Laboratory of Exercise Physiology, Biomechanics, and Sports Medicine, Faculty of Education, University of Tokyo, Japan.
Eur J Appl Physiol Occup Physiol. 1993;66(1):65-9. doi: 10.1007/BF00863402.
The effect of glucose (Glc) ingestion before and during daily, repeated, prolonged exercise on metabolism and performance was tested. Seven young, healthy males performed cycling exercise in two series, with 1 month interval. Each exercise series consisted of 1 h/day on 3 successive days. On the 3rd day, exercise was continued until exhaustion. The intensity was 73.4 (7.7)% [mean (SD)] of maximal oxygen uptake (VO2max). Glucose (Glc) or placebo (P) drink was ingested 15 min before the start, and at 15 and 45 min of each daily exercise. The total amount of Glc ingested was 43.1 (4.2) g. During exercise, blood Glc concentrations were significantly higher (P < 0.05) when Glc was ingested than when P was ingested [Glc 5.14 (0.32) and P 4.12 (4.17) mmol.l-1 at exhaustion]. However, Glc ingestion did not improve performance time to exhaustion [Glc 92.05 (29.55) and P 98.07 (27.33) min]. Free fatty acid concentrations were significantly lower when Glc was ingested than when P was ingested [Glc 0.63 (0.21) and P 1.39 (0.46) mmol.l-1 at exhaustion]. There were no significant differences in exercise heart rate, VO2, respiratory exchange ratio, blood lactate concentrations or rating of perceived exertion between the conditions nor were there any significant differences in these parameters on different days of exercise. It seems that ingestion of small amounts of Glc does not increase the metabolism of carbohydrate or improve the performance of intensive endurance exercise of poorly trained subjects, even when the exercise is repeated daily.
测试了每日重复长时间运动前及运动期间摄入葡萄糖（Glc）对代谢和运动表现的影响。七名年轻健康男性分两个系列进行自行车运动，间隔1个月。每个运动系列连续3天，每天运动1小时。在第3天，运动持续至力竭。运动强度为最大摄氧量（VO2max）的73.4（7.7）%[平均值（标准差）]。在每次日常运动开始前15分钟、运动期间15分钟和45分钟时摄入葡萄糖（Glc）饮料或安慰剂（P）饮料。摄入的葡萄糖总量为43.1（4.2）克。运动期间，摄入葡萄糖时的血糖浓度显著高于摄入安慰剂时（P<0.05）[力竭时葡萄糖组为5.14（0.32）mmol·l-1，安慰剂组为4.12（4.17）mmol·l-1]。然而，摄入葡萄糖并未改善力竭时间[葡萄糖组为92.05（29.55）分钟，安慰剂组为98.07（27.33）分钟]。摄入葡萄糖时的游离脂肪酸浓度显著低于摄入安慰剂时[力竭时葡萄糖组为0.63（0.21）mmol·l-1，安慰剂组为1.39（0.46）mmol·l-1]。两种情况下的运动心率、VO2、呼吸交换率、血乳酸浓度或主观用力程度评分均无显著差异，且在不同运动日这些参数也无显著差异。即使每日重复运动，摄入少量葡萄糖似乎也不会增加碳水化合物的代谢或改善训练不足的受试者的高强度耐力运动表现。
