PWC60%HRreserveを用いた有酸素パワーの評価

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Twenty-five untrained healthy subjects performed two incremental exercise tests on a cycle ergometer in order to examine whether physical working capacity at 60% heart rate reserve (PWC_(60%HRreserve)) would be useful as the index of evaluating aerobic power in middle-aged men. On the first day, the subjects performed maximal exercise until exhaustion to determine aerobic power assessed by maximal oxygen uptake (VO_2max) and ventilatory threshold (Th_v). Another day, they also performed submaximal exercise consisted of four stages with increase every 3 min and PWC_(60%HRreserve) was extrapolated from the regression equation between heart rates and mechanical power outputs. As a result, heart rate reserve (i.e. maximal heart rate minus resting heart rate) correlated significantly (P<0.01) with both VO_(2max) (r=0.67) and VO_2 at Th_v(VO(2Thv))(r=0.71) respectively. The mean value of heart rate at Th_v (HR_(Thv)) was corresponding to approximately 60% heart rate reserve and the values of HR_(Thv) and 60% heart rate researve were well coincided each other with a highly correlation coefficient (r=0.78, p<0.001). A sufficient highly relationship was observed between PWC(60%HRreserve) and VO_(2Thv) (r=0.87, p<0.001) as well as VO_(2max) (r=0.83, p<0.001). These results demonstrate that heart rate reserve reflects cardiorespiratory fitness and is adequate to express physical exercise stress, and thus PWC_(60%HRreserve) provides practical evaluation of aerobic power in middle-aged men.最大自転車エルゴメーター駆動時の予備心拍数(HR_reserve)の相対水準における身体作業能力(PWC)が有酸素パワーの評価法として有用性があるかどうかを検討するために，21～46歳の健康な成人男性を被験者として，最大酸素摂取量(VO_(2max))，換気性閾値(VO_(2Thv)), PWC_(60%HRreserve)を測定し，それらの相関関係(r)について検討したところ，HR_reserveはVO_(2max) (r=0.67)やVO_(2Thv)(r=0.71)との間に有意な正の相関関係を示し，個々の体力的特性をよく反映していた。また，VO_(2Thv)における心拍数(HR_(Thv))は，およそ60%HR_reserveに相当していたが，これらの相関関数はr=0.78と高く，HR_(Thv)は60%HR_reserveによって適切に表示することができた。さらに，PWC_(60%HRreserve)とVO_(2max)(r=0.83)およびVO_(2Thv)(r=0.87)との間には有意な高い相関関係が認められた。このことから，PWC_(60%HRreserve)は従来の方法と比較して，有酸素パワーの評価法として有用な指標であると考えられた。

PWC60%HRreserveを用いた有酸素パワーの評価

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