Document Detail

Synchronization of motor units in human masseter during a prolonged isometric contraction.
MedLine Citation:
PMID:  2231405     Owner:  NLM     Status:  MEDLINE    
1. The action potentials of concurrently active motor units in human masseter were recorded on several fine-wire intramuscular electrodes and synchronization was assessed by cross-correlation of their firing times. 2. Long recording sessions and a test of significance for peaks in histograms were used to enhance detection of synchrony. 3. Synchrony in masseter units was found to be very weak, and was observed consistently only in histograms with a large number of counts. However, synchrony was widespread within the motoneurone pool; of the unit pairs whose cross-correlation histograms contained more than 100 counts per 1 ms bin, 89% were significantly synchronized. 4. The strength of synchrony between pairs of units did not change consistently during 15 min of continuous activity. 5. It was concluded that most, if not all, low-threshold masseter motoneurones have some common synaptic inputs, although the origin of those inputs remains unclear.
M A Nordstrom; T S Miles; K S Türker
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of physiology     Volume:  426     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  1990 Jul 
Date Detail:
Created Date:  1990-12-06     Completed Date:  1990-12-06     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  409-21     Citation Subset:  IM    
Department of Physiology, University of Adelaide, South Australia.
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MeSH Terms
Action Potentials
Isometric Contraction*
Masseter Muscle / innervation*
Motor Neurons / physiology*
Time Factors

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

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