換気および心臓の仕事量増加の酸素摂取緩成分に及ぼす影響

概要

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The study reinvestigated the effect of the proposed mediators, which were the oxygen costs of increasing minute ventilation and heart rate, on the slow component of VO_2 (VO_2SC) during heavy exercise. In this study, we analyzed using the data from our four previous studies that examined the factors of VO_2SC. Experiments in the previous studies consisted of cycling (three) and running (one) exercises and were carried out by two different exercise conditions in each experiment. (i.e. different pedal rate or different grade trials) The estimate of the oxygen cost of minute ventilation was calculated using the data from Anholm et al. (1987) and Aaron et al. (1992). The oxygen cost of the work of heart was calculated from heart rate by Kitamura et al. (1972) method. Regardless of the method used to estimate the oxygen cost of minute ventilation, the relative contribution to VO_2SC was around 10-20 percent. On the other hand, it was only one percent that oxygen cost of work of heart contributed to the VO_2SC. As a result, this study suggests that the relative contribution of the proposed mediators (minute ventilation and heart rate) to the VO_2SC would not be great. Then we support the result of previous studies that a major of VO_2SC was causing from exercising muscle.
久留米大学の論文