Physical working capacity at 60% heart rate reserve (PWC60%HRreserve) strongly correlated with oxygen uptake at ventilatory threshold (r=0.87) and maximal oxygen uptake (r=0.83) in healthy men.
Cross-Sectional (n=25)
No
Does physical working capacity at 60% heart rate reserve (PWC_(60%HRreserve)) accurately reflect aerobic power compared to maximal oxygen uptake in untrained healthy middle-aged men?
PWC at 60% heart rate reserve provides a practical and accurate submaximal evaluation of aerobic power in middle-aged men, correlating strongly with maximal oxygen uptake.
Effect estimate: r=0.87
p-value: p=<0.001
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 (VO₂max) and ventilatory threshold (Thᵥ). 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 VO₂ at Thᵥ (VO (2Thv) ) (r=0. 71) respectively. The mean value of heart rate at Thᵥ (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 (HRᵣeserve) 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, HRᵣeserve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%HRᵣeserve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%HRᵣeserve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。
宮井 et al. (Wed,) conducted a cross-sectional in Healthy untrained men (n=25). Physical working capacity at 60% heart rate reserve (PWC60%HRreserve) vs. Physical working capacity at 75% maximal heart rate (PWC75%HRmax) was evaluated on Correlation between PWC60%HRreserve and oxygen uptake at ventilatory threshold (VO2Thv) (r=0.87, p=<0.001). Physical working capacity at 60% heart rate reserve (PWC60%HRreserve) strongly correlated with oxygen uptake at ventilatory threshold (r=0.87) and maximal oxygen uptake (r=0.83) in healthy men.