Mason W L, McConell G, Hargreaves M
Exercise Metabolism Unit, Victoria University of Technology, Footscray, Australia.
Med Sci Sports Exerc. 1993 Aug;25(8):966-9.
Six trained men were studied during 2 h of exercise at 65% VO2max to examine the influence of the physical form of carbohydrate supplementation on blood glucose and insulin responses. Three exercise tests were performed in randomized order, at least 1 wk apart. Subjects ingested 25 g of carbohydrate or 500 ml of a sweet placebo (CON) at 0, 30, 60, and 90 min of exercise. Carbohydrate was ingested as 500 ml of a 5% rice-based liquid (L-CHO) or as a 31-g food bar (S-CHO). No differences in oxygen uptake, respiratory exchange ratio, or heart rate were observed between trials. Blood glucose levels were higher (P < 0.05) throughout exercise when carbohydrate was ingested, compared with CON. No differences in blood glucose during exercise were observed between L-CHO and S-CHO. Plasma insulin levels were higher (P < 0.05) after 120 min of exercise when carbohydrate was ingested. The results of this study indicate that carbohydrate supplements with differing physical form (liquid vs solid) but equal carbohydrate content produce similar blood glucose and insulin responses during exercise.
对六名经过训练的男性进行了研究，让他们在65%最大摄氧量的强度下进行2小时的运动，以检验碳水化合物补充剂的物理形态对血糖和胰岛素反应的影响。三项运动测试按随机顺序进行，每次间隔至少1周。在运动的0、30、60和90分钟时，受试者摄入25克碳水化合物或500毫升甜味安慰剂（CON）。碳水化合物以500毫升5%的米制液体（L-CHO）或31克的食物棒（S-CHO）的形式摄入。各试验之间在摄氧量、呼吸交换率或心率方面未观察到差异。与CON相比，摄入碳水化合物时，整个运动过程中的血糖水平更高（P<0.05）。L-CHO和S-CHO之间在运动期间的血糖方面未观察到差异。运动120分钟后，摄入碳水化合物时血浆胰岛素水平更高（P<0.05）。本研究结果表明，具有不同物理形态（液体与固体）但碳水化合物含量相同的碳水化合物补充剂在运动期间产生相似的血糖和胰岛素反应。
