Hirano Masahiro, Gomi Masahiro, Katoh Munenori
Department of Physical Therapy, Faculty of Health Sciences, Ryotokuji University, Japan.
J Phys Ther Sci. 2016 Sep;28(9):2474-2476. doi: 10.1589/jpts.28.2474. Epub 2016 Sep 29.
[Purpose] This study aimed to investigate the effect of trunk stability on isometric knee extension muscle strength measurement while sitting by performing simultaneous measurements with a handheld dynamometer (HHD) and an isokinetic dynamometer (IKD) in the same seated condition. [Subjects and Methods] The subjects were 30 healthy volunteers. Isometric knee extension muscle strength was simultaneously measured with a HHD and an IKD by using an IKD-specific chair. The measurement was performed twice. Measurement instrument variables and the number of measurements were examined by using the analysis of variance and correlation tests. [Results] The measurement instrument variables and the number of measurements were not significantly different. The correlation coefficients between the HHD and IKD measurements were ≥0.96. [Conclusion] Isometric knee extension muscle strength measurement using the HHD in the sitting position resulted in a lower value than that using the IKD, presumably because of the effect of trunk stability on the measurement. In the same seated posture with trunk stability, no significant difference in measurement values was observed between the HHD and IKD. The present findings suggest that trunk stability while seated during isometric knee extension muscle strength measurement influenced the HHD measurement.
[目的] 本研究旨在通过在相同坐姿下使用手持测力计（HHD）和等速测力计（IKD）同时进行测量，探讨躯干稳定性对坐姿等长伸膝肌力测量的影响。[对象与方法] 研究对象为30名健康志愿者。使用特定于IKD的椅子，通过HHD和IKD同时测量等长伸膝肌力。测量进行两次。通过方差分析和相关性检验来检查测量仪器变量和测量次数。[结果] 测量仪器变量和测量次数无显著差异。HHD和IKD测量之间的相关系数≥0.96。[结论] 坐姿下使用HHD测量等长伸膝肌力的值低于使用IKD测量的值，推测这是由于躯干稳定性对测量的影响。在躯干稳定的相同坐姿下，HHD和IKD之间未观察到测量值的显著差异。本研究结果表明，等长伸膝肌力测量时坐姿下的躯干稳定性影响了HHD测量。
