Document Detail

Spontaneous motor unit behavior in human thenar muscles after spinal cord injury.
MedLine Citation:
PMID:  11410924     Owner:  NLM     Status:  MEDLINE    
Our first aim was to characterize spontaneous motor unit activity in thenar muscles influenced by chronic cervical spinal cord injury. Thenar surface electromyography (EMG), intramuscular EMG, and abduction and flexion forces were recorded. Subjects were instructed to relax for 2 min. Units still firing after 10 s were considered spontaneously active. Two distinct patterns of spontaneous unit activity were recorded. Units either fired tonically at a mean frequency of 6.1 HZ or were active sporadically (2.2 HZ). Stimuli (e.g., light touch of nearby skin) were then used to influence tonic spontaneous unit activity. Most stimuli produced a change in firing frequency, usually a temporary increase, but sometimes unit frequency decreased or new activity was initiated. Inputs to these motoneurons clearly make important contributions to changes in unit activity. However, the difficulty that subjects had in stopping unit activity, and the initiation of activity when subjects relaxed, suggest that the source of spontaneity may be the motoneuron itself.
I Zijdewind; C K Thomas
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Muscle & nerve     Volume:  24     ISSN:  0148-639X     ISO Abbreviation:  Muscle Nerve     Publication Date:  2001 Jul 
Date Detail:
Created Date:  2001-06-18     Completed Date:  2001-07-12     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7803146     Medline TA:  Muscle Nerve     Country:  United States    
Other Details:
Languages:  eng     Pagination:  952-62     Citation Subset:  IM    
Copyright Information:
Copyright 2001 John Wiley & Sons, Inc.
Department of Medical Physiology, University of Groningen, Groningen, The Netherlands.
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MeSH Terms
Chronic Disease
Evoked Potentials, Motor / physiology*
Membrane Potentials / physiology
Middle Aged
Motor Neurons / physiology*
Muscle Contraction / physiology
Muscle, Skeletal / innervation*,  physiology*
Paralysis / diagnosis,  physiopathology
Spinal Cord Injuries / diagnosis,  physiopathology*
Thumb / innervation*
Volition / physiology
Grant Support

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

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