Document Detail


A finite element model for describing the effect of muscle shortening on surface EMG.
MedLine Citation:
PMID:  16602565     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A finite-element model for the generation of single fiber action potentials in a muscle undergoing various degrees of fiber shortening is developed. The muscle is assumed fusiform with muscle fibers following a curvilinear path described by a Gaussian function. Different degrees of fiber shortening are simulated by changing the parameters of the fiber path and maintaining the volume of the muscle constant. The conductivity tensor is adapted to the muscle fiber orientation. In each point of the volume conductor, the conductivity of the muscle tissue in the direction of the fiber is larger than that in the transversal direction. Thus, the conductivity tensor changes point-by-point with fiber shortening, adapting to the fiber paths. An analytical derivation of the conductivity tensor is provided. The volume conductor is then studied with a finite-element approach using the analytically derived conductivity tensor. Representative simulations of single fiber action potentials with the muscle at different degrees of shortening are presented. It is shown that the geometrical changes in the muscle, which imply changes in the conductivity tensor, determine important variations in action potential shape, thus affecting its amplitude and frequency content. The model provides a new tool for interpreting surface EMG signal features with changes in muscle geometry, as it happens during dynamic contractions.
Authors:
Luca Mesin; Michelle Joubert; Tania Hanekom; Roberto Merletti; Dario Farina
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  IEEE transactions on bio-medical engineering     Volume:  53     ISSN:  0018-9294     ISO Abbreviation:  IEEE Trans Biomed Eng     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-04-10     Completed Date:  2006-05-02     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0012737     Medline TA:  IEEE Trans Biomed Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  593-600     Citation Subset:  IM    
Affiliation:
Laboratorio di Ingegneria del Sistema Neuromuscolare (LISiN), Dipartimento di Elettronica, Politecnico di Torino, 10129 Torino, Italy.
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MeSH Terms
Descriptor/Qualifier:
Action Potentials / physiology*
Animals
Anisotropy
Computer Simulation
Diagnosis, Computer-Assisted / methods*
Electromyography / methods*
Finite Element Analysis
Humans
Models, Biological*
Movement / physiology*
Muscle Contraction / physiology*
Skin Physiological Phenomena*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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