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Muscle volume as a predictor of maximum force generating ability in the plantar flexors post-stroke

Muscle volume as a predictor of maximum force generating ability in the plantar flexors post-stroke

Authors :
Jill S. Higginson
Stuart A. Binder-Macleod
Brian A. Knarr
Thomas S. Buchanan
John W. Ramsay
Source :
Muscle & Nerve. 48:971-976
Publication Year :
2013
Publisher :
Wiley, 2013.

Abstract

Introduction: Post-stroke muscle weakness is commonly thought to be the result of a combination of decreased voluntary activation and decreased maximum force generating ability (MFGA). We assessed the ability of muscle volumes obtained using MRI to estimate the MFGA of the plantar flexor muscle group in individuals post-stroke. Methods: MRI was used to measure muscle volume of the plantar flexor muscle group in 17 individuals with post-stroke hemiparesis. A modified burst superimposition test was used to measure force of volitional contraction and predict the MFGA of the plantar flexors. Results: While muscle volume obtained by means of MRI provided information on the overall size of muscle, it overestimated the force generating ability of the paretic plantar flexors. Conclusions: Results suggest that MRI-derived muscle volume underestimates the functional impairment in individuals post-stroke. Interestingly, the central activation ratio had a strong relationship with the maximum volitional force of contraction. Muscle Nerve 48: 971–976, 2013

Details

ISSN :
0148639X
Volume :
48
Database :
OpenAIRE
Journal :
Muscle & Nerve
Accession number :
edsair.doi...........eb402f755bde13b4dd63d07d56fa9cd9
Full Text :
https://doi.org/10.1002/mus.23835