Kingwell B, McKenna M J, Sandstrom E R, Hargreaves M
Department of Physiology, University of Melbourne, Australia.
J Sports Sci. 1989 Spring;7(1):3-8. doi: 10.1080/02640418908729817.
Nine male triathletes were studied during 160 min of exercise at 65% VO2 max on two occasions to examine the effect of glucose polymer ingestion on energy and fluid balance. During one trial they received 200 ml of a 10% glucose polymer solution at 20 min intervals during exercise (CHO), while in the other they received an equal volume of a sweet placebo (CON). On average, blood glucose levels (CON = 4.2 +/- 0.2 mmol l-1, CHO = 4.8 +/- 0.1, mean +/- S.E.) and respiratory exchange ratios (CON = 0.84 +/- 0.01, CHO = 0.87 +/- 0.01) during exercise were higher (P less than 0.05) as a result of the glucose polymer ingestion. There were no differences between trials, however, in the estimated plasma volume changes during exercise. Exercise time to exhaustion at an intensity corresponding to 110% VO2 max, performed 5 min after the submaximal exercise, was not influenced by glucose polymer ingestion. Relative to a control exercise bout conducted without prior exercise, however, sprint performance and postexercise blood lactate accumulation were impaired in both trials. It is concluded that glucose polymer ingestion maintains blood glucose levels and a high rate of carbohydrate oxidation during prolonged exercise, without compromising fluid balance.
对9名男性铁人三项运动员进行了两次研究，每次在65%最大摄氧量的强度下进行160分钟的运动，以检验摄入葡萄糖聚合物对能量和液体平衡的影响。在一次试验中，他们在运动期间每隔20分钟接受200毫升10%的葡萄糖聚合物溶液（CHO），而在另一次试验中，他们接受等量的甜味安慰剂（CON）。平均而言，由于摄入葡萄糖聚合物，运动期间的血糖水平（CON = 4.2 +/- 0.2毫摩尔/升，CHO = 4.8 +/- 0.1，平均值 +/- 标准误）和呼吸交换率（CON = 0.84 +/- 0.01，CHO = 0.87 +/- 0.01）更高（P < 0.05）。然而，两次试验在运动期间估计的血浆量变化方面没有差异。在次最大运动后5分钟进行的相当于110%最大摄氧量强度的运动至疲劳时间不受葡萄糖聚合物摄入的影响。然而，相对于没有事先运动的对照运动回合，两次试验中的冲刺表现和运动后血乳酸积累均受损。结论是，摄入葡萄糖聚合物可在长时间运动期间维持血糖水平和高碳水化合物氧化率，而不会损害液体平衡。
