Saeki Junya, Ikezoe Tome, Yoshimi Soyoka, Nakamura Masatoshi, Ichihashi Noriaki
Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan.; Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan; Research Fellow of the Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan.
Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.
Clin Biomech (Bristol). 2019 Jan;61:222-226. doi: 10.1016/j.clinbiomech.2018.12.013. Epub 2018 Dec 19.
We aimed to investigate the menstrual cycle variation and the gender difference of the triceps surae muscle stiffness and passive stiffness of the ankle joint.
The subjects of the study included 12 healthy young women and 12 healthy young men. Shear elastic moduli of the lateral gastrocnemius, medial gastrocnemius, and soleus muscles were measured as an index of muscle stiffness using shear wave elastography. The passive stiffness of the ankle joint was calculated from passive torque when the ankle joint was passively dorsiflexed. Measurements were conducted in the follicular, ovulatory, and luteal phases to examine the menstrual cycle variation.
There was no difference noted in the passive stiffness or triceps surae muscle stiffness for young women in the menstrual cycle. As for gender differences, passive stiffness in all menstrual phases in women was lower while the soleus muscle stiffness in women was higher, compared to that in men.
Our findings suggest that passive stiffness and muscle stiffness did not differ in the menstrual cycle. In addition, the measured part of the soleus was more tensioned in women than in men.
我们旨在研究比目鱼肌僵硬程度以及踝关节被动僵硬程度的月经周期变化和性别差异。
本研究的受试者包括12名健康年轻女性和12名健康年轻男性。使用剪切波弹性成像技术测量外侧腓肠肌、内侧腓肠肌和比目鱼肌的剪切弹性模量，作为肌肉僵硬程度的指标。通过踝关节被动背屈时的被动扭矩计算踝关节的被动僵硬程度。在卵泡期、排卵期和黄体期进行测量，以研究月经周期变化。
年轻女性在月经周期中的被动僵硬程度或比目鱼肌僵硬程度没有差异。至于性别差异，与男性相比，女性在所有月经周期阶段的被动僵硬程度较低，而女性的比目鱼肌僵硬程度较高。
我们的研究结果表明，被动僵硬程度和肌肉僵硬程度在月经周期中没有差异。此外，女性比目鱼肌的测量部位比男性更紧张。
