中強度自転車運動初期におけるガス交換動態の日内変動

概要

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Circadian rhythms(diurnal variations)in many physiological parameters have been reported. However, there are no data on gas exchange kinetics at the onset of exercise. The purpose of this study was to establish whether there are circadian rhythms in gas exchange kinetics at the onset of exercise. Six male subjects performed 120 W exercise on a cycle ergometer for 7 min in the morning(AM;7:00〜8:30)and evening(PM;16:30〜17:30). Rectal temperature(Tr)and mean skin temperature(T_<sk> at rest were significantly higher PM than AM, the differences being 0.9±0.2℃ and 0.7±0.2℃, respectively. Respiratory and circulatory parameters at rest and during exercise were not different between AM and PM. The time constants of oxygen uptake(V_<O2>), carbon dioxide output(V_<CO2>), minute ventilation(V_E), heart rate(HR), and oxygen pulse(V_<O2>/HR)showed the same results. There was no relationship between temperature parameters(Tr, T_<sk>)and the time constants. It is suggested that circadian thythms reflected by the change in body temperature do not have any effect on gas exchange kinetics at the onset of moderate bicycle exercise.
日本体力医学会の論文
1993-10-01