Estimation of individual muscle force using elastography

Bouillard, Killian, Nordez, Antoine and Hug, Francois (2011) Estimation of individual muscle force using elastography. PLoS ONE, 6 12: e29261.1-e29261.6. doi:10.1371/journal.pone.0029261


Author Bouillard, Killian
Nordez, Antoine
Hug, Francois
Title Estimation of individual muscle force using elastography
Journal name PLoS ONE   Check publisher's open access policy
ISSN 1932-6203
Publication date 2011-12
Year available 2011
Sub-type Article (original research)
DOI 10.1371/journal.pone.0029261
Open Access Status DOI
Volume 6
Issue 12
Start page e29261.1
End page e29261.6
Total pages 7
Place of publication San Francisco, CA United States
Publisher Public Library of Science
Collection year 2012
Language eng
Formatted abstract
Background: Estimation of an individual muscle force still remains one of the main challenges in biomechanics. In this way, the present study aimed: (1) to determine whether an elastography technique called Supersonic Shear Imaging (SSI) could be used to estimate muscle force, (2) to compare this estimation to that one provided by surface electromyography (EMG), and (3) to determine the effect of the pennation of muscle fibers on the accuracy of the estimation.

Methods and Results: Eleven subjects participated in two experimental sessions; one was devoted to the shear elastic modulus measurements and the other was devoted to the EMG recordings. Each session consisted in: (1) two smooth linear torque ramps from 0 to 60% and from 0 to 30% of maximal voluntary contraction, for the first dorsal interosseous and the abductor digiti minimi, respectively (referred to as "ramp contraction"); (2) two contractions done with the instruction to freely change the torque (referred to as "random changes contraction"). Multi-channel surface EMG recordings were obtained from a linear array of eight electrodes and the shear elastic modulus was measured using SSI. For ramp contractions, significant linear relationships were reported between EMG activity level and torque (R 2 = 0.949±0.036), and between shear elastic modulus and torque (R 2 = 0.982±0.013). SSI provided significant lower RMS deviation between measured torque and estimated torque than EMG activity level for both types of contraction (1.4±0.7 vs. 2.8±1.4% of maximal voluntary contraction for "ramp contractions", p<0.01; 4.5±2.3 vs. 7.9±5.9% of MVC for "random changes contractions", p<0.05). No significant difference was reported between muscles.

Conclusion:
The shear elastic modulus measured using SSI can provide a more accurate estimation of individual muscle force than surface EMG. In addition, pennation of muscle fibers does not influence the accuracy of the estimation
Keyword Magnetic resonance elastography
Transient Elastography
Surface Electromyogram
Elastic Properties
Shear
Stiffness
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
 
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Created: Wed, 28 Aug 2013, 16:07:19 EST by Francois Hug on behalf of School of Health & Rehabilitation Sciences