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| Research article summary (published 30 Aug 2009): |
Fatigue-related changes in fascicle-tendon geometry over repeated contractions: difference between synergist muscles.
Full Abstract
Fatigue-induced changes in force production of synergist muscles were evaluated through observation of fascicle-tendon geometry and electromyography (EMG). Seven subjects performed 60 maximal isometric plantar flexions intermittently. No statistically significant intermuscle difference was observed in the decrease of mean EMG amplitudes or mean power frequency for the medial gastrocnemius (MG) and soleus (SOL) muscles. The tendon elongation of MG significantly decreased after the 19th contraction, and MG fascicle length increased after the 29th contraction, while SOL fascicle and tendon length did not change except for the last contraction. The declines in torques were highly correlated with the increase of MG fascicle length and decrease in tendon elongation in each subject, while no consistent relationship was found for SOL. These results suggest that changes in force-production of MG and SOL over repeated contractions differ, which is reflected in fascicle-tendon geometry.
Author information
Author/s: Mitsukawa, Naotoshi (N); Sugisaki, Norihide (N); Kanehisa, Hiroaki (H); Fukunaga, Tetsuo (T); Kawakami, Yasuo (Y);
Affiliation: Graduate School of Sport Sciences, Waseda University, Saitama, Japan.
Journal and publication information
Publication Type: Journal Article
Journal: Muscle & nerve (Muscle Nerve), published in United States. (Language: eng)
Reference: 2009-Sep; vol 40 (issue 3) : pp 395-401
Dates: Created 2009/08/31; Completed 2009/10/06;
PMID: 19705427, status: MEDLINE (last retrieval date: 10/6/2009, IMS Date: )
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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