著者

寺尾 保 恩田 哲也 有賀 誠司

出版者

東海大学

雑誌

東海大学スポーツ医科学雑誌 (ISSN:09153659)

巻号頁・発行日

vol.12, pp.19-27, 2000

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The purpose of this study is to elucidate the energy metabolism in a simulation of the fifth section of the Hakone Ekiden(disrance of 20.7km)using a runner-motion-response-type treadmill in a laboratory. Five male runners aged 20.2±.6 years were asked to run at their desired speds on a programmable treadmill whose"slope-setting"was changed automatically every fifty meters. The runners watched a video of the acrual course during this experiment. We found a significant correlation between the slope every fifty meters and the mean step length(r=-0.695)and step frequency(r=0.646). The mean values of oxygen uptake and respiratory exchange ratio of the five runners were 59.83±5.42(range 56.35-62.55)ml/kg/min and 0.99±0.05(range 0.97-1.01), respectively. The total energy expenditure and energy expenditure deduced from carbohydrates and lipids in this fifth section were 1632±58 kcal, 1502±120 kcal, and 130±96 kcal, respectively. In the case of an upward slope, we observed a significant correlation between energy expenditure(kcal/kg)for the five runners and mean step length(r=-0.942), mean step frequency(r=0.918), and running time(r=0.982). These results indicate that about 90% of the total energy used in the fifth section is supplied by the carbohydrate component and showed the high intersity of exercise during this section. In conclusion, our results for the upward slope showed that good long-distance runners use a longer step length, and thereby save energy and thus realize an improved running economy.