肥満女子運動選手における脂質消費の至適運動強度

概要

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The purposes of this study were to investigate the lipid metabolism in obese athletes as compared to normal athletes, and to determine the optimal exercise intensity to reduce % fat in obese athletes. Energy expenditure rate, lipid oxidation rate and glucose oxidation rate were measured in an obese athlete group (OG, % fat≧28%, n=10) and a normal athlete control group (CG, % fat≦18%, n=10) at rest and during pedaling exercise, which consisted of 5 different intensities (40, 50, 60, 70 and 80% VO_2max). The results were summarized as follows; 1) In energy expenditure rate at rest, no significant difference was observed between OG and CG. In lipid oxidation rate at rest, OG was significantly higher than CG, and in glucose oxidation rate at rest, CG was significantly higher than OG. 2) In lipid oxidation rate during exercise, OG was higher than CG, especially the value in 60% VO_2max was significant. 3) Lipid oxidation rate in case of 40, 50 and 60% VO_2max in OG was approximately constant. These results suggested that the characteristics of lipid metabolism between obese and normal athletes are different both at rest and during exercise and the optimal exercise intensity to reduce % Fat in obese athletes maybe 60% VO_2max.