Document Detail

Effects of eccentric jaw exercise on temporal summation in jaw-closing muscles of healthy subjects.
MedLine Citation:
PMID:  20047846     Owner:  NLM     Status:  MEDLINE    
Eccentric jaw exercises has been known to cause muscle soreness but no studies have so far examined to what extent temporal summation mechanisms within the exercised muscles are changed. The purpose of the present study was to investigate the effects of an eccentric biting exercise on the temporal summation, mechanical pressure sensitivity and jaw muscle activity. A total of 15 healthy men participated in a two-session-experiment: In one session, they performed 30 min controlled eccentric jaw exercise and the other session served as a no-exercise control. Soreness sensations at rest and during maximal biting, pressure pain thresholds (PPTs) and electromyographic (EMG) activity during maximal jaw biting were recorded before (baseline), immediately after (Post-task), and 1 day after the exercise (1-day-after). The temporal summation ratio using intra-muscular electrical stimulation of the masseter was investigated at baseline and at 1-day-after. The eccentric jaw exercise was associated with significant increases in soreness sensation and decreased PPTs at Post-task and at 1-day-after. The EMG activity and biting force did not change. The summation ratio was significantly decreased at 1-day-after in both sessions. The present findings demonstrate that eccentric jaw exercise does not induce detectable changes in temporal summation. However, the summation ratio may have clinical utility to differentiate the location of sensitization.
Tetsurou Torisu; Kelun Wang; Peter Svensson; Antoon De Laat; Mihoko Tanaka; Akiko Shimada; Akiko Ikoma; Hiroshi Murata; Lars Arendt-Nielsen
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2010-01-04
Journal Detail:
Title:  European journal of pain (London, England)     Volume:  14     ISSN:  1532-2149     ISO Abbreviation:  Eur J Pain     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-20     Completed Date:  2010-10-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9801774     Medline TA:  Eur J Pain     Country:  England    
Other Details:
Languages:  eng     Pagination:  719-24     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2009 European Federation of International Association for the Study of Pain Chapters. Published by Elsevier Ltd. All rights reserved.
Center for Sensory-Motor Interaction, Aalborg University, Fredrik Bajers Vej 7 D-3, DK-9220 Aalborg, Denmark.
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MeSH Terms
Analysis of Variance
Bite Force
Exercise / physiology*
Jaw / physiopathology*
Masseter Muscle / physiopathology*
Muscle Contraction / physiology*
Pain / physiopathology*
Pain Measurement
Pain Threshold / physiology*
Grant Support
1 R01DE015420-01/DE/NIDCR NIH HHS

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