Gleeson M, Maughan R J, Greenhaff P L
Eur J Appl Physiol Occup Physiol. 1986;55(6):645-53. doi: 10.1007/BF00423211.
Six men were studied during exercise to exhaustion on a cycle ergometer at 73% of VO2max following ingestion of glycerol, glucose or placebo. Five of the subjects exercised for longer on the glucose trial compared to the placebo trial (p less than 0.1; 108.8 vs 95.9 min). Exercise time to exhaustion on the glucose trial was longer (p less than 0.01) than on the glycerol trial (86.0 min). No difference in performance was found between the glycerol and placebo trials. The ingestion of glucose (lg X kg-1 body weight) 45 min before exercise produced a 50% rise in blood glucose and a 3-fold rise in plasma insulin at zero min of exercise. Total carbohydrate oxidation was increased by 26% compared to placebo and none of the subjects exhibited a fall in blood glucose below 4 mmol X 1-1 during the exercise. The ingestion of glycerol (lg X kg-1 body weight) 45 min before exercise produced a 340-fold increase in blood glycerol concentration at zero min of exercise, but did not affect resting blood glucose or plasma insulin levels; blood glucose levels were up to 14% higher (p less than 0.05) in the later stages of exercise and at exhaustion compared to the placebo or glucose trials. Both glycerol and glucose feedings lowered the magnitude of the rise in plasma FFA during exercise compared to placebo. Levels of blood lactate and alanine during exercise were not different on the 3 dietary treatments.(ABSTRACT TRUNCATED AT 250 WORDS)
六名男性在摄入甘油、葡萄糖或安慰剂后，于自行车测力计上以最大摄氧量的73%进行运动直至力竭。与安慰剂试验相比，五名受试者在葡萄糖试验中的运动时间更长（p<0.1；108.8分钟对95.9分钟）。葡萄糖试验中的力竭运动时间比甘油试验更长（p<0.01）（86.0分钟）。甘油试验和安慰剂试验之间未发现运动表现有差异。运动前45分钟摄入葡萄糖（1g/kg体重）使运动开始0分钟时血糖升高50%，血浆胰岛素升高3倍。与安慰剂相比，总碳水化合物氧化增加了26%，且在运动过程中没有受试者的血糖降至4mmol/L以下。运动前45分钟摄入甘油（1g/kg体重）使运动开始0分钟时血甘油浓度增加340倍，但不影响静息血糖或血浆胰岛素水平；与安慰剂或葡萄糖试验相比，运动后期和力竭时血糖水平高出14%（p<0.05）。与安慰剂相比，甘油和葡萄糖摄入均降低了运动期间血浆游离脂肪酸升高的幅度。三种饮食处理在运动期间的血乳酸和丙氨酸水平没有差异。（摘要截短至250字）
