座位ペダリング運動終了直後の仰臥体位変換が心拍減衰時定数(T_<30>)に及ぼす影響

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The present study was undertaken to evaluate the effects of vagal tone and arterial baroreflex control on heart rate decay in the saddle sitting and supine position immediately after pedaling exercise. In eight healthy young maled (aged 22.63±1.28 yr), we measured intervals between heart beats during a 30s period immediately after moderate pedaling exercise, as intensity of anerobic threshold (AT) for 5 minutes. The time constant of the heart rate decay (T_<30>) was reduced significantly in the supine position compared to in the saddle sitting position (t=8.94, p<0.01). Stroke volume using calculation methods by expired gas parameters (breath by breath) was clearly increased in the supine compared to in the saddle sitting position after exercise. However, the stroke volume that is the origin of arterial blood pressure increased for only a short amount of time after exercise at both recovery conditions. Furthermore, the peak △SV (peak value of changes in stroke volume from the end of exercise to a short amount of time after exercise) related to the T_<30> in all subjects (Sitting ; r=0.837, t=-3.752, p<0.01, Supine ; r=0.878, t=-4.484, p<0.01). In addition, peak value of oxygen uptake (peak Vo_2) and the T_<30> were also strongly related (Sitting, r=0.874, t=-4.415, p<0.01, Supine ; r=0.880, t=-4.536, p<0.01). These findings indicate that the reduction of the T_<30> is induced by 1> increase of cardiac vagal activity by the arterial baroreflex with central command mechanism and 2) the vagal tone by switching system as arterial baroreflex.
日本運動生理学会の論文
2000-01-31

座位ペダリング運動終了直後の仰臥体位変換が心拍減衰時定数(T_<30>)に及ぼす影響

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