Open AccessMagnetic resonance imaging based muscle strain rate mapping during eccentric contraction to study effects of unloading induced by unilateral limb suspension
Author(s) -
Usha Sinha,
Vadim Malis,
Robert Csapo,
Marco V. Narici,
Shantanu Sinha
Publication year - 2020
Publication title -
european journal of translational myology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.271
H-Index - 6
eISSN - 2037-7460
pISSN - 2037-7452
DOI - 10.4081/ejtm.2019.8935
Subject(s) - isometric exercise , eccentric , magnetic resonance imaging , concentric , contraction (grammar) , anatomy , strain (injury) , muscle contraction , medicine , materials science , physics , radiology , geometry , mathematics , quantum mechanics
Age- and disuse- related loss of muscle force is disproportionately larger than the loss of muscle mass. Earlier studies reported that comparing concentric and eccentric contractions, there is a significant age-related decrease in force only in concentric contractions. Magnetic Resonance Imaging enables mapping of muscle deformation and has been used to study isometric but not eccentric contractions. We report MRI based strain rate mapping of the medial gastrocnemius in subjects pre- and post-unloading induced by Unilateral Limb Suspension. In contrast to isometric contraction, no difference in strain rate indices were observed post-unloading, in conformance with preserved force during eccentric contractions.