持久性トレーニングの有酸素条件は長距離選手の脂質利用を亢進する

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We investigated the enhancement of the lipids utilization of distance runners with improvement of the aerobic state by endurance training. Subjects were general students and student distance runners who lived in the dormitory and had the same diet and training program. Physical characteristics, characteristics of weight loss and recovery by training volume, the relationship between weight loss and performance, the relationship between obesity rate and maximum oxygen uptake, and changes in plasma lipid induced by high oxygen inhalation were studied. Body weight was measured by electrical body balance. Training volume was expressed by total training distance (km/day). Skinfold thickness was measured by skinfold meter. Maximum oxygen uptake was measured by using a bicycle ergometer. Plasma lipids were determined by thin layer-and gas-chromatography. An oxygen generator was used for high oxygen inhalation. Daily weight loss of distance runners by endurance training was proportioned to the training volume (r=0.86, p<0.05). The weight loss and recovery of distance runners were proportional to the training volume, but weight recovery was lower than weight loss. The mean of weight loss during sleep (g/h) increased with a more than 16 km training volume, but at a 31 km training volume, high and low weight loss groups were significantly distinguished. Total weight loss (?kg) at the training camp was related to performance (5000 m run, 10,000 m run and 20 km run), and distance runners with low weight loss showed high performance. Elite distance runners showed a relationship between performance and skinfold thickness (r=0.65, p<0.05), but others did not. There was a significant relationship between obesity rate and maximum oxygen uptake (r=-0.78, p<0.05) in distance runners. Plasma TG and TPL of distance runners were significantly lower than those of the control (p<0.05). Plasma FFA, CE and TPL of distance runners increased after high oxygen inhalation (40%) for 20 min. From these results, we concluded that weight loss in distance runners is mostly dependent on training volume (energy expenditure = oxygen consumption). Increase of training volume means enlargement of the aerobic state in the living body. Mobilization of plasma lipids induced by high oxygen inhalation indicates that enlargement of the aerobic state by training volume enhances the lipids utilization of distance runners, and thus reflects on the remarkably low skinfold thickness of distance runners.
2004-03-31

持久性トレーニングの有酸素条件は長距離選手の脂質利用を亢進する

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