Tsintzas O K, Williams C, Wilson W, Burrin J
Department of Physical Education, Sports Science and Recreation Management, Loughborough University, Leicestershire, United Kingdom.
Med Sci Sports Exerc. 1996 Nov;28(11):1373-9. doi: 10.1097/00005768-199611000-00005.
The aim of this study is to examine the effect of carbohydrate (CHO) ingestion during the first hour of treadmill running on endurance capacity. Eleven male subjects ran at 70% VO2max to exhaustion on three occasions one week apart. On two occasions two CHO-electrolyte solutions (a 5.5% (E) and a 6.9% (L) were ingested for the first hour of exercise; water was ingested until exhaustion. On the third occasion water (W) was ingested throughout the run. The order testing was randomly assigned. Exhaustion times for the W, E, and L trials were 109.6 +/- 9.6 min, 124.5 +/- 8.4 min, and 121.4 +/- 9.4 min, respectively. There was no difference between the two CHO trials, but time to exhaustion was longer only for the E trial (P < 0.05), compared with the W trial. Nevertheless the average performance times for the combined results of the two CHO trials were longer than the water trial. Carbohydrate ingestion resulted in higher blood glucose concentration (P < 0.01) at 20 min in the E trail only and lower (P < 0.05) serum growth hormone and plasma FFA and glycerol concentrations at 60 min but not at exhaustion in both E and L trials compared with the W trial. Blood lactate, plasma ammonia, electrolytes, catecholamines, and serum insulin and cortisol concentrations were not different in the three trials. In conclusion, CHO ingestion during the first hour of exercise improves endurance capacity go a greater extent compared with water alone.
本研究的目的是检验在跑步机跑步的第一个小时内摄入碳水化合物（CHO）对耐力的影响。11名男性受试者以70%的最大摄氧量（VO2max）跑步直至力竭，共进行三次，每次间隔一周。其中两次，在运动的第一个小时摄入两种CHO电解质溶液（一种5.5%（E），另一种6.9%（L））；直至力竭时一直摄入水。第三次，在整个跑步过程中摄入水（W）。测试顺序随机分配。W、E和L试验的力竭时间分别为109.6±9.6分钟、124.5±8.4分钟和121.4±9.4分钟。两次CHO试验之间没有差异，但与W试验相比，只有E试验的力竭时间更长（P<0.05）。然而，两次CHO试验综合结果的平均表现时间比水试验更长。摄入碳水化合物仅在E试验中20分钟时导致血糖浓度升高（P<0.01），在60分钟时导致血清生长激素、血浆游离脂肪酸和甘油浓度降低（P<0.05），但在E和L试验中力竭时与W试验相比无差异。三项试验中血乳酸、血浆氨、电解质、儿茶酚胺以及血清胰岛素和皮质醇浓度没有差异。总之，与单独饮水相比，运动第一个小时摄入CHO能在更大程度上提高耐力。
