Yokote Tsubasa, Koga Hidenobu, Eriguchi Kyohei, Imamura Yoshihiro
Department of Rehabilitation, Aso Iizuka Hospital: 3-83 Iizuka-shi, Yoshio-cho, Fukuoka 820-8505, Japan.
Department of Clinical Research Support Office, Aso Iizuka Hospital, Japan.
J Phys Ther Sci. 2020 Apr;32(4):265-268. doi: 10.1589/jpts.32.265. Epub 2020 Apr 2.
[Purpose] The mortality rate increases when peak oxygen uptake is less than 5 metabolic equivalents, and peak oxygen uptake correlates with knee extensor muscle strength. This study aimed to determine the knee extensor muscle strength at peak oxygen uptake corresponding to 5 metabolic equivalents. [Participants and Methods] We enrolled 45 consecutive patients (29 males and 16 females; average age, 63.6 ± 13.7 years) with heart disease receiving outpatient rehabilitation with us. We performed cardiopulmonary exercise testing with a bicycle ergometer to measure peak oxygen uptake. We investigated the relationship between peak oxygen uptake and isometric knee extensor muscle strength divided by the body weight (kgf/kg). The cutoff value for knee extensor muscle strength with peak oxygen uptake corresponding to 5 metabolic equivalents was calculated. [Results] Knee extensor muscle strength was significantly positively associated with peak oxygen uptake. The cutoff value for knee extensor muscle strength at peak oxygen uptake corresponding to 5 metabolic equivalents was 0.46 kgf/kg. [Conclusion] In this study, the cutoff value for knee extensor muscle strength for achieving peak oxygen uptake corresponding to 5 metabolic equivalents in patients with heart disease was 0.46kgf/kg.
[目的] 当峰值摄氧量低于5代谢当量时死亡率会升高，且峰值摄氧量与膝关节伸肌力量相关。本研究旨在确定对应于5代谢当量的峰值摄氧量时的膝关节伸肌力量。[参与者与方法] 我们纳入了45例连续的在我院接受门诊康复治疗的心脏病患者（29例男性和16例女性；平均年龄63.6±13.7岁）。我们使用自行车测力计进行心肺运动测试以测量峰值摄氧量。我们研究了峰值摄氧量与按体重（千克力/千克）划分的等长膝关节伸肌力量之间的关系。计算出对应于5代谢当量的峰值摄氧量时膝关节伸肌力量的临界值。[结果] 膝关节伸肌力量与峰值摄氧量显著正相关。对应于5代谢当量的峰值摄氧量时膝关节伸肌力量的临界值为0.46千克力/千克。[结论] 在本研究中，心脏病患者达到对应于5代谢当量的峰值摄氧量时膝关节伸肌力量的临界值为0.46千克力/千克。
