Hargreaves M, Costill D L, Fink W J, King D S, Fielding R A
Med Sci Sports Exerc. 1987 Feb;19(1):33-6.
Six men were studied to compare the effects of pre-exercise carbohydrate feedings on endurance performance and muscle glycogen utilization during prolonged exercise. Trials consisted of a cycling ride to exhaustion at 75% maximal oxygen uptake preceded by the ingestion of either 75 g of glucose in 350 ml of water (GLU), 75 g of fructose in 350 ml of water (FRU), or 350 ml of an artificially sweetened and flavored placebo (CON). No differences were observed between trials for oxygen uptake, respiratory exchange ratio, heart rate, or exercise time to exhaustion (CON = 92.7 +/- 5.2 min, FRU = 90.6 +/- 12.4, and GLU = 92.8 +/- 11.3, mean +/- SE). Blood glucose was elevated as a result of the GLU feeding, but fell rapidly with the onset of exercise, reaching a low of 4.02 +/- 0.34 mmol X l-1 at 15 min of exercise. Serum insulin also increased following the GLU feeding but had returned to pre-drink levels by 30 min of exercise. No differences in blood glucose and insulin were observed between FRU and CON. Muscle glycogen utilization during the first 30 min of exercise (CON = 46.3 +/- 8.2 mmol X kg-1 wet weight, FRU = 56.3 +/- 3.0 mmol X kg-1 wet weight, GLU = 50.0 +/- 4.9 mmol X kg-1 wet weight) and total glycogen use (CON = 93.4 +/- 11.1, FRU = 118.8 +/- 10.9, and GLU = 99.5 +/- 4.3) were similar in the three trials.(ABSTRACT TRUNCATED AT 250 WORDS)
对六名男性进行了研究，以比较运动前碳水化合物摄入对长时间运动期间耐力表现和肌肉糖原利用的影响。试验包括在摄入以下物质后，以最大摄氧量的75%进行骑自行车直至力竭：350毫升水中的75克葡萄糖（GLU）、350毫升水中的75克果糖（FRU）或350毫升人工甜味和调味的安慰剂（CON）。在摄氧量、呼吸交换率、心率或运动至力竭时间方面，各试验之间未观察到差异（CON = 92.7 ± 5.2分钟，FRU = 90.6 ± 12.4分钟，GLU = 92.8 ± 11.3分钟，平均值 ± 标准误）。由于摄入GLU，血糖升高，但运动开始后迅速下降，在运动15分钟时降至4.02 ± 0.34毫摩尔/升的低点。摄入GLU后血清胰岛素也增加，但在运动30分钟时已恢复到饮用前水平。FRU和CON之间未观察到血糖和胰岛素的差异。在运动的前30分钟内肌肉糖原利用情况（CON = 46.3 ± 8.2毫摩尔/千克湿重，FRU = 56.3 ± 3.0毫摩尔/千克湿重，GLU = 50.0 ± 4.9毫摩尔/千克湿重）以及总糖原使用量（CON = 93.4 ± 11.1，FRU = 118.8 ± 10.9，GLU = 99.5 ± 4.3）在三项试验中相似。（摘要截断于250字）
