Yamauchi Tomoyuki, Yamada Takumi, Satoh Yoshinao
Department of Rehabilitation, Nihon University Hospital: 1-6 Kandasurugadai, Chiyoda-ku, Tokyo 101-8309, Japan.
Department of Physical Therapy Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, Japan.
J Phys Ther Sci. 2021 Apr;33(4):334-338. doi: 10.1589/jpts.33.334. Epub 2021 Apr 6.
[Purpose] The purpose of this study was to clarify the relationship between muscle echo intensity measured with ultrasound and the isokinetic strength of each of the three superficial quadriceps femoris muscles in healthy young adults. [Participants and Methods] We measured the echo intensity of the three superficial muscles of the quadriceps femoris in 25 healthy adults (10 males and 15 females; mean age, 22.3 years) using ultrasound. Moreover, we obtained the maximum force during isokinetic knee extension at 60°/s using an isokinetic dynamometer. [Results] In males and females, a significant negative correlation between echo intensity and muscle strength was found in the VM (r=-0.65 and r=-0.63, respectively). [Conclusion] In both males and females, only the muscle echo intensity of the vastus medialis was found to have a negative correlation with the maximum force during isokinetic knee extension at 60°/s. Our data lay the foundation for simplifying and rationally performing the measurement of muscle echo intensity of the quadriceps femoris. And it would therefore be sufficient to only measure the VM to clarify a relationship between EI and maximum isokinetic force in the quadriceps.
[目的] 本研究旨在阐明超声测量的肌肉回声强度与健康年轻成年人股四头肌三块表浅肌肉各自等速肌力之间的关系。[参与者与方法] 我们使用超声测量了25名健康成年人（10名男性和15名女性；平均年龄22.3岁）股四头肌三块表浅肌肉的回声强度。此外，我们使用等速测力计在60°/s的等速膝关节伸展过程中获取了最大力量。[结果] 在男性和女性中，股内侧肌（VM）的回声强度与肌肉力量之间均存在显著负相关（分别为r = -0.65和r = -0.63）。[结论] 在男性和女性中，仅发现股内侧肌的肌肉回声强度与60°/s等速膝关节伸展过程中的最大力量呈负相关。我们的数据为简化和合理进行股四头肌肌肉回声强度测量奠定了基础。因此，仅测量股内侧肌就足以阐明回声强度（EI）与股四头肌最大等速力量之间的关系。
