The effect of a high carbohydrate diet and glycogen depletion on graded maximal exercise

概要

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The present investigation examined the influence of dietary carbohydrate (CHO) on the performance of graded maximal exercise on a bicycle ergometer. A group of highly trained college students [mean age 22.2 (SD 1.6) years] completed three trials of graded maximal exercise under three dietary conditions; normal diet (ND), glycogen depleted (CHD), and glycogen loaded (CHL) conditions with each trial separated by five days. Measurements of work done, maximal oxygen intake (Vo_<2max>), serum lactae, glucose, and free fatty acids (FFA) concentrations were compared. The highest total work done was recorded by the CHL condition while the values obtained by the CHD and ND were similar. Although there was no significant difference in Vo_<2max> among the three conditions, the value for the CHL was lower than those for the other two conditions. Observing blood lactate and FFA responses during the exercise, the increased reliance on elevated carbohydrate oxidation with preexercise carbohydrate loading was most likely related to the higher work output done because a higher concentration in blood lactate and a suppression of blood FFA during exercise were demonstrated.
中京大学の論文
1997-01-20