International Journal of Sport and Health Science
Online ISSN : 1880-4012
Print ISSN : 1348-1509
ISSN-L : 1348-1509
Superimposed Mechanomyographic Response at Different Contraction Intensity in Medial Gastrocnemius and Soleus Muscles
Yoichi OhtaNorihiro ShimaKyonosuke Yabe
著者情報
ジャーナル フリー

2007 年 5 巻 p. 63-70

詳細
抄録

This study examined changes in mechanical properties of medial gastrocnemius muscle (MG) and soleus muscle (SOL) at different contraction intensities using superimposed mechanomyogram (MMG) signals. The subjects were measured for the superimposed twitch amplitude and peak acceleration of the twitch torque development (d2T /dt 2) from electrical stimulation of the posterior tibial nerve during isometric plantar flexions at 20%, 40%, 60%, 80%, and 100% of maximal voluntary contraction (MVC). In addition, the superimposed MMG amplitude was recorded from MG and SOL. The superimposed twitch amplitude, d2T /dt 2 and superimposed MMG amplitude of MG and SOL decreased with increasing %MVC. With increasing %MVC, changes in the pattern of superimposed MMG of the MG were similar to the changes in the pattern of d2T /dt 2. There were significant relationships between the superimposed twitch amplitude and the superimposed MMG amplitude of MG and SOL, and the d2T /dt 2 and superimposed MMG amplitude of MG and SOL. The normalized superimposed MMG amplitude of the MG at 20% and 40% of MVC is significantly higher than that of SOL. These results suggest that superimposed MMG signals recorded from synergistic muscle (MG and SOL) reflects individual mechanical activation levels at lower contraction intensity.

著者関連情報
© 2007 Japan Society of Physical Education, Health and Sport Sciences
前の記事 次の記事
feedback
Top