Evidence for intermuscle difference in slack angle in human triceps surae
Evidence for intermuscle difference in slack angle in human triceps surae
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DOI：
10.1016/j.jbiomech.2015.01.039
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发表时间：
2015-04-13
影响因子：
2.4
通讯作者：
Miyamoto, Naokazu
中科院分区：
文献类型：
--
作者：
Hirata, Kosuke;Kanehisa, Hiroaki;Miyamoto, Naokazu
这项研究检查了松弛角（即，对应于松弛长度的关节角度）在体内人小腿三头肌的增效剂之间变化。应用超声剪切波弹性成像技术，对9名健康成人小腿三头肌在伸膝位、跖屈50 °、角速度1 °/s被动拉伸时各肌群的剪切模量进行了测量。从踝关节角度-剪切模量关系确定每块肌肉的松弛角，作为剪切模量的第一次增加。内侧腓肠肌（20.7 +/- 6.7度跖屈位）的松弛角显著大于外侧腓肠肌（14.9 +/- 6.7度跖屈位）和比目鱼肌（2.0 +/- 4.8度背屈位），外侧腓肠肌的松弛角大于比目鱼肌。这项研究提供的证据表明，松弛角不同的小腿三头肌;内侧腓肠肌产生被动力量在最跖屈的位置，而松弛角的比目鱼肌是最背屈的位置。(C)2015爱思唯尔有限公司版权所有。
This study examined whether the slack angle (i.e., the joint angle corresponding to the slack length) varies among the synergists of the human triceps surae in vivo. By using ultrasound shear wave elastography, shear modulus of each muscle of the triceps surae was measured during passive stretching from 50 degrees of plantar flexion in the knee extended position at an angular velocity of 1 degrees/s in 9 healthy adult subjects. The slack angle of each muscle was determined from the ankle joint angle-shear modulus relationship as the first increase in shear modulus. The slack angle was significantly greater in the medial gastrocnemius (20.7 +/- 6.7 degrees plantarflexed position) than in the lateral gastrocnemius (14.9 +/- 6.7 degrees plantarflexed position) and soleus (2.0 +/- 4.8 degrees dorsiflexed position) and greater in the lateral gastrocnemius than in the soleus. This study provided evidence that the slack angle differs among the triceps surae; the medial gastrocnemius produced passive force at the most plantarflexed position while the slack angle of the soleus was the most dorsiflexed position. (C) 2015 Elsevier Ltd. All rights reserved.