Muscle shear elastic modulus is linearly related to muscle torque over the entire range of isometric contraction intensity

Ates, Filiz, Hug, Francois, Bouillard, Killian, Jubeau, Marc, Frappart, Thomas, Couade, Mathieu, Bercoff, Jeremy and Nordez, Antoine (2015) Muscle shear elastic modulus is linearly related to muscle torque over the entire range of isometric contraction intensity. Journal of Electromyography and Kinesiology, 25 4: 703-708. doi:10.1016/j.jelekin.2015.02.005


Author Ates, Filiz
Hug, Francois
Bouillard, Killian
Jubeau, Marc
Frappart, Thomas
Couade, Mathieu
Bercoff, Jeremy
Nordez, Antoine
Title Muscle shear elastic modulus is linearly related to muscle torque over the entire range of isometric contraction intensity
Journal name Journal of Electromyography and Kinesiology   Check publisher's open access policy
ISSN 1873-5711
1050-6411
Publication date 2015-08-01
Sub-type Article (original research)
DOI 10.1016/j.jelekin.2015.02.005
Open Access Status Not yet assessed
Volume 25
Issue 4
Start page 703
End page 708
Total pages 6
Place of publication Camden, London, United Kingdom
Publisher Elsevier
Language eng
Subject 2801 Neuroscience (miscellaneous)
1304 Biophysics
2728 Clinical Neurology
Abstract Muscle shear elastic modulus is linearly related to muscle torque during low-level contractions (<60% of Maximal Voluntary Contraction, MVC). This measurement can therefore be used to estimate changes in individual muscle force. However, it is not known if this relationship remains valid for higher intensities. The aim of this study was to determine: (i) the relationship between muscle shear elastic modulus and muscle torque over the entire range of isometric contraction and (ii) the influence of the size of the region of interest (ROI) used to average the shear modulus value. Ten healthy males performed two incremental isometric little finger abductions. The joint torque produced by Abductor Digiti Minimi was considered as an index of muscle torque and elastic modulus. A high coefficient of determination (R) (range: 0.86-0.98) indicated that the relationship between elastic modulus and torque can be accurately modeled by a linear regression over the entire range (0% to 100% of MVC). The changes in shear elastic modulus as a function of torque were highly repeatable. Lower R values (0.89 ± 0.13 for 1/16 of ROI) and significantly increased absolute errors were observed when the shear elastic modulus was averaged over smaller ROI, half, 1/4 and 1/16 of the full ROI) than the full ROI (mean size: 1.18 ± 0.24 cm). It suggests that the ROI should be as large as possible for accurate measurement of muscle shear modulus.
Formatted abstract
Muscle shear elastic modulus is linearly related to muscle torque during low-level contractions (<60% of Maximal Voluntary Contraction, MVC). This measurement can therefore be used to estimate changes in individual muscle force. However, it is not known if this relationship remains valid for higher intensities. The aim of this study was to determine: (i) the relationship between muscle shear elastic modulus and muscle torque over the entire range of isometric contraction and (ii) the influence of the size of the region of interest (ROI) used to average the shear modulus value. Ten healthy males performed two incremental isometric little finger abductions. The joint torque produced by Abductor Digiti Minimi was considered as an index of muscle torque and elastic modulus. A high coefficient of determination (R2) (range: 0.86–0.98) indicated that the relationship between elastic modulus and torque can be accurately modeled by a linear regression over the entire range (0% to 100% of MVC). The changes in shear elastic modulus as a function of torque were highly repeatable. Lower R2 values (0.89 ± 0.13 for 1/16 of ROI) and significantly increased absolute errors were observed when the shear elastic modulus was averaged over smaller ROI, half, 1/4 and 1/16 of the full ROI) than the full ROI (mean size: 1.18 ± 0.24 cm2). It suggests that the ROI should be as large as possible for accurate measurement of muscle shear modulus.
Keyword Abductor Digiti Minimi
Force
Shear wave
Supersonic shear imaging
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Health and Rehabilitation Sciences Publications
 
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