Influence of tendon slack on electromechanical delay in the human medial gastrocnemius in vivo

被引:106
作者
Muraoka, T [1 ]
Muramatsu, T
Fukunaga, T
Kanehisa, H
机构
[1] Univ Tokyo, Lab Sports Sci, Dept Life Sci, Grad Sch Arts & Sci,Meguro Ku, Tokyo 1538902, Japan
[2] Japan Soc Promot Sci, Chiyoda Ku, Tokyo 1028471, Japan
[3] Keio Univ, Inst Phys Educ, Kanagawa 2238521, Japan
[4] Waseda Univ, Dept Sports Sci, Tokorozawa, Saitama 3591192, Japan
关键词
ultrasonography; electrical stimulations; force transmission capability; ankle joint;
D O I
10.1152/japplphysiol.01015.2002
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The purpose of this study was to clarify the influence of muscle-tendon complex stretch on electromechanical delay (EMD) in terms of the extent of tendon slack in the human medial gastrocnemius (MG). EMD and MG tendon length were measured at each of five ankle joint angles ( - 30, - 20, - 10, 0, and 5degrees: positive values for dorsiflexion) using percutaneous electrical stimulation and ultrasonography, respectively. The extent of MG tendon slack was calculated as MG tendon length shortening, standardized with MG tendon slack length obtained at the joint angle (-16degrees +/- 5degrees) where the passive ankle joint torque was zero. EMD at - 30degrees (19.2 +/- 2.2 ms) and - 20degrees (17.2 +/- 1.3 ms) was significantly greater than that at - 10degrees (16.0 +/- 2.3 ms), 0degrees (15.0 +/- 1.4 ms), and 5degrees (14.8 +/- 1.4 ms), and at 0 and 5degrees, respectively. The relative EMD, normalized with the maximal EMD for each subject, decreased dependent on the extent of decrease in MG tendon slack. There were no significant differences in EMD among the joint angles (-10, 0, and 5degrees) where MG tendon slack was taken up. These results suggest that the extent of tendon slack is an important factor for determining EMD.
引用
收藏
页码:540 / 544
页数:5
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