Document Detail

Multielectrode surface EMG for noninvasive estimation of motor unit size.
MedLine Citation:
PMID:  10417788     Owner:  NLM     Status:  MEDLINE    
To noninvasively estimate the motor unit size, we present a novel surface electromyographic (EMG) measurement system consisting of a surface multielectrode with four-pin electrodes and a pair of surface-disk electrodes. Surface motor unit action potentials (MUAPs) were recorded with the multielectrode, in the so-called multielectrode surface EMG (MSEMG), which was spatially filtered to localize the sensing area and reduce the noise. In addition, a modified decomposition algorithm, considering the geometrical configuration of the multielectrode, was designed to identify the individual MUAPs in the measured MSEMG. The identified MUAP was subsequently used as the triggering source for the EMG signals recorded by the surface-disk electrodes. From a pool of 34 subjects with neuromuscular diseases and 14 normal subjects, the median amplitudes of surface-disk EMG after spike-triggered averaging, called MSEMG-MUAP, correlated well (r = 0.82, P < 0.0001) with those of macro EMG. Moreover, the MSEMG-MUAP recording during a ramp force contraction exhibited the common size principle phenomenon during motor unit recruitment. The results of this study demonstrate that the MSEMG-MUAP measurement is a feasible approach for estimating the motor unit size from the skin surface.
T Y Sun; T S Lin; J J Chen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Muscle & nerve     Volume:  22     ISSN:  0148-639X     ISO Abbreviation:  Muscle Nerve     Publication Date:  1999 Aug 
Date Detail:
Created Date:  2001-01-26     Completed Date:  2002-08-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7803146     Medline TA:  Muscle Nerve     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1063-70     Citation Subset:  IM    
Copyright Information:
Copyright 1999 John Wiley & Sons, Inc.
Institute of Biomedical Engineering, National Cheng-Kung University, 1 Ta-Shueh Road, Tainan 701, Taiwan.
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MeSH Terms
Computer Simulation
Electromyography / instrumentation*,  methods*
Middle Aged
Motor Neurons / physiology*
Muscles / physiology*
Neuromuscular Diseases / physiopathology*

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

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