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Strain distribution within human triceps surae muscles during isometric contraction: in vivo study by Tagging MRI
Author(s) -
Oda Toshiaki,
Kinugasa Ryuta,
Rajendra Mayoran,
Himeno Ryutaro,
Kataoka Hiroyuki,
Yokota Hideo,
Yamamoto Akio,
Kanehisa Hiroaki,
Fukunaga Tetsuo,
Kawakami Yasuo
Publication year - 2008
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.22.1_supplement.753.24
Subject(s) - isometric exercise , strain (injury) , anatomy , sagittal plane , triceps surae muscle , contraction (grammar) , soleus muscle , in vivo , skeletal muscle , biomedical engineering , chemistry , medicine , biology , microbiology and biotechnology
Sizable strain induces injuries of biological tissues. Non‐uniform distribution of strain in a contracting muscle has been predicted with computer simulation, with no actual data available for living human muscles. The study objective was to determine in vivo local strain of human triceps surae muscles during isometric contraction with tagging MRI. Quasi‐sagittal MR images with grid‐tagging of soft tissues were obtained while the subject (n=6 men) repeated sub‐maximal plantar flexions at 40% of maximal voluntary contraction force. Local deformation of muscle tissues was determined from the displacement of each cross grid traced by a pattern‐matching program. The local strain was computed from the displacements based on finite element theory. In all subjects, considerable intramuscular non‐uniform strain was observed in both the soleus and gastrocmenius muscles. Strain over 20% concentrated on the origin of the soleus muscle, and large strains were also observed near the boundaries of each muscle and between muscle and bone. Individual differences in strain were considerably large both in magnitude and distribution. Strain concentration on a specific part could be related with the site‐specificity of the occurrence of muscle injury.