Gastrocnemius and soleus are selectively activated when adding knee extensor activity to plantar flexion
Gastrocnemius and soleus are selectively activated when adding knee extensor activity to plantar flexion
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DOI：
10.1016/j.humov.2014.04.009
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发表时间：
2014-08-01
影响因子：
2.1
通讯作者：
Fukashiro, Senshi
中科院分区：
文献类型：
--
作者：
Suzuki, Takahito;Chino, Kentaro;Fukashiro, Senshi
腓肠肌是一种双关节肌肉，它不仅起到足底屈肌的作用，还起到屈膝肌的作用，这意味着它在伸膝过程中是一个拮抗者。相比之下，比目鱼肌是单关节的足底屈肌。基于这种解剖学上的差异，这些肌肉的活动应该在许多日常生活活动中同时发生的足底屈曲和膝关节伸展过程中选择性地激活。这项研究考察了当膝关节伸肌的自愿等长激活被添加到自愿等长足底屈曲时，腓肠肌和比目鱼肌的选择性激活。10名男性志愿者以10%、20%和30%的最大用力进行等长足底屈曲。在每次足底屈曲任务中，分别以0%、50%和100%的最大用力增加等长伸膝。当增加伸膝时，无论足底屈曲程度如何，腓肠肌内侧肌电活动的平均校正值显著降低(P=.002)，而比目鱼肌的肌电活动的平均校正值显著增加(P<；.001)。这些结果表明，足底屈曲同时伴有膝关节伸展活动导致比目鱼肌的选择性激活和腓肠肌的协同活动的抑制。(C)2014爱思唯尔B.V.保留所有权利。
The gastrocnemius is a biarticular muscle that acts not only as a plantar flexor, but also as a knee flexor, meaning that it is an antagonist during knee extension. In contrast, the soleus is a monoarticular plantar flexor. Based on this anatomical difference, these muscles' activities should be selectively activated during simultaneous plantar flexion and knee extension, which occur during many activities of daily living. This study examined the selective activation of gastrocnemius and soleus activities when voluntary isometric activation of knee extensors was added to voluntary isometric plantar flexion. Ten male volunteers performed isometric plantar flexion at 10%, 20%, and 30% of maximum effort. During each plantar flexion task, isometric knee extension was added at 0%, 50%, and 100% of maximum effort. When knee extension was added, the average rectified value of the electromyographic activity of the medial gastrocnemius was significantly depressed (P = .002), whereas that of the soleus was significantly increased (P < .001) regardless of the plantar flexion level. These results suggest that plantar flexion with concurrent knee extensor activity leads to selective activation of the soleus and depression of the synergistic activity of the gastrocnemius. (C) 2014 Elsevier B.V. All rights reserved.