Journal
JOURNAL OF BIOMECHANICS
Volume 48, Issue 6, Pages 1210-1213Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2015.01.039
Keywords
Gastrocnemius; Soleus; Passive force; Shear wave elastography; Ankle joint
Categories
Funding
- JSPS KAKENHI Grant [25702038]
- Grants-in-Aid for Scientific Research [15K12646, 25702038] Funding Source: KAKEN
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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.
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