Nakamura Masatoshi, Ikezoe Tome, Kobayashi Takuya, Umegaki Hiroki, Takeno Yohei, Nishishita Satoru, Ichihashi Noriaki
Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan.
Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan.
Ultrasound Med Biol. 2014 Sep;40(9):1991-7. doi: 10.1016/j.ultrasmedbio.2014.03.024. Epub 2014 Jun 25.
This study investigated the acute effects of static stretching (SS) on shear elastic modulus as an index of muscle hardness and muscle stiffness and the relationship between change in shear elastic modulus and change in muscle stiffness after SS. The patients were 17 healthy young males. Muscle stiffness was measured during passive ankle dorsiflexion using a dynamometer and ultrasonography before (pre) and immediately after (post) 2 min of SS. In addition, shear elastic modulus was measured by a new ultrasound technique called ultrasonic shear wave elastography. The post-SS values for muscle stiffness and shear elastic modulus were significantly lower than the pre-SS values. In addition, Spearman's rank correlation coefficient indicated a significant correlation between rate of change in shear elastic modulus and rate of change in muscle stiffness. These results suggest that SS is an effective method for decreasing shear elastic modulus as well as muscle stiffness and that shear elastic modulus measurement using the shear wave elastography technique is useful in determining the effects of SS.
本研究调查了静态拉伸（SS）对作为肌肉硬度和肌肉僵硬度指标的剪切弹性模量的急性影响，以及SS后剪切弹性模量变化与肌肉僵硬度变化之间的关系。研究对象为17名健康年轻男性。在SS前（预）和SS 2分钟后立即（后），使用测力计和超声检查在被动踝关节背屈过程中测量肌肉僵硬度。此外，通过一种称为超声剪切波弹性成像的新超声技术测量剪切弹性模量。SS后肌肉僵硬度和剪切弹性模量的值显著低于SS前的值。此外，斯皮尔曼等级相关系数表明剪切弹性模量变化率与肌肉僵硬度变化率之间存在显著相关性。这些结果表明，SS是降低剪切弹性模量以及肌肉僵硬度的有效方法，并且使用剪切波弹性成像技术测量剪切弹性模量有助于确定SS的效果。
