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本文对八名健康的男性进行运动前果糖、葡萄糖摄入和运动中肌糖元利用率的比较研究。受试者完成三个随机拟定的试验,每个试验包括以75%最大吸氧量做30分钟自行车练习。每次试验开始前45分钟,受试者口服50克葡萄糖,或50克果糖,或50克人工合成甜料。试验中吸氧量和呼吸商无差异。葡萄糖的摄入使血糖升高(P<0.05)。随着训练的进行,葡萄糖组的血糖迅速下降,运动到20分钟时,达到每升3.18±0.15(SE)毫克分子的最低点。这个值低于果糖试验组(3.79±0.20)和合成甜糖试验组(3.99±0.18)的相应值。果糖组和合成甜料组在运动中血糖水平没有差异。肌糖元的利用率,葡萄糖组(55.4±3.3毫克分子/公斤体重)大于合成甜料组(42.8±4.2)(P<0.05),但果糖组和合成甜料组没有这种差别(P=0.07)。肌糖元的利用率存在一种倾向,即果糖组低于葡萄糖组。总之这些结果表明运动前摄入葡萄糖的效果是不利的,通常果糖组和合成甜料组则没有这种情况。
In this paper, eight healthy men exercise pre-exercise fructose, glucose uptake and exercise muscle glycogen utilization comparative study. Subjects completed three randomized trials, each of which included a 30-minute bike exercise at a maximum oxygen uptake of 75%. Forty-five minutes prior to the start of each trial, the subject orally administered 50 grams of glucose, or 50 grams of fructose, or 50 grams of synthetic sweetener. No differences in oxygen uptake and respiratory quotient were observed during the experiment. Glucose intake increased blood glucose (P <0.05). As training progressed, blood glucose in the glucose group decreased rapidly and reached the lowest point of 3.18 ± 0.15 (SE) milligrams per liter at 20 minutes of exercise. This value is lower than the corresponding value of the fructose test group (3.79 ± 0.20) and the synthetic sweet sugar test group (3.99 ± 0.18). Fructose and synthetic sweeteners had no difference in their blood glucose levels during exercise. Muscle glycogen utilization was greater in the glucose group (55.4 ± 3.3 mg / kg body weight) than in the synthetic sweetener group (42.8 ± 4.2) (P <0.05), but not between the fructose and synthetic sweeteners groups (P = 0.07). Muscle glycogen utilization there is a tendency, that fructose group than glucose group. Taken together, these results suggest that the effect of pre-exercise glucose ingestion is detrimental, as is generally not the case with fructose and synthetic sweeteners.