Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Faculty of Health and Sports Science, Doshisha University, Kyoto, Japan.
Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
J Biomech. 2021 Jun 9;122:110421. doi: 10.1016/j.jbiomech.2021.110421. Epub 2021 Apr 8.
This study aimed to examine the effect of rectus femoris (RF) elongation with passive hip angle change on the shear moduli of the vastus lateralis (VL) and medialis (VM) to verify whether Epimuscular myofascial force transmission (EMFT) occurs in the human quadriceps. Fourteen healthy men participated in this study. The shear moduli of the RF, VL, and VM were measured in four hip positions: flexion (Flex), extension and abduction (Ext-Abd), extension (Ext), and extension and adduction (Ext-Add). As the behavior of shear moduli may differ depending on the parts of the vasti muscles, we measured the medial and lateral parts of the VL (Medial-VL and Lateral-VL) and VM (Medial-VM and Lateral-VM). The shear moduli at the Ext and Ext-Add positions were higher than at the Flex position in the RF, VL, and VM. The shear moduli during Ext and Ext-Add were higher than at the Ext-Abd in the RF, VL, and Lateral-VM. Moreover, the shear modulus of the Lateral-VM was higher than of the Medial-VM (Flex: 8.5% higher; Ext-Abd: 15.6%; Ext: 30.2%; Ext-Add: 32.6%). The shear moduli of the VL and VM, which are monoarticular muscles of the knee, increased with passive hip extension or adduction with extension, even when the knee angle was kept constant. The results suggest that EMFT occurs in the quadriceps, and EMFT had a great impact in the Lateral-VM, which is anatomically adjacent to the RF, but it had little effect in the Medial-VM, which is further away from the RF.
本研究旨在探讨股直肌（RF）随被动髋关节角度变化而伸长对股外侧肌（VL）和股内侧肌（VM）剪切模量的影响，以验证人体四头肌中是否存在肌筋膜内力传递（EMFT）。14 名健康男性参与了这项研究。在四个髋关节位置（屈曲（Flex）、伸展和外展（Ext-Abd）、伸展（Ext）和伸展和内收（Ext-Add））下测量了 RF、VL 和 VM 的剪切模量。由于剪切模量的行为可能因股四头肌的不同部位而异，我们测量了 VL（内侧-VL 和外侧-VL）和 VM（内侧-VM 和外侧-VM）的内侧和外侧部分。在 RF、VL 和 VM 中，伸展和伸展内收位置的剪切模量高于屈曲位置。在 RF、VL 和外侧-VM 中，伸展和伸展内收时的剪切模量高于伸展外展时。此外，外侧-VM 的剪切模量高于内侧-VM（Flex：高 8.5%；Ext-Abd：高 15.6%；Ext：高 30.2%；Ext-Add：高 32.6%）。VL 和 VM 是膝关节的单关节肌，即使膝关节角度保持不变，随着髋关节被动伸展或伸展内收，它们的剪切模量也会增加。这些结果表明，EMFT 发生在四头肌中，并且 EMFT 在解剖上与 RF 相邻的外侧-VM 中具有很大的影响，但在远离 RF 的内侧-VM 中影响较小。
