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Effects of eccentric jaw exercise on temporal summation in jaw-closing muscles of healthy subjects.

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Title: Effects of eccentric jaw exercise on temporal summation in jaw-closing muscles of healthy subjects.
Authors: Torisu, Tetsurou / Wang, Kelun / Svensson, Peter / Laat, Antoon De / Tanaka, Mihoko / Shimada, Akiko / Ikoma, Akiko / Murata, Hiroshi / Arendt-Nielsen, Lars
Issue Date: 2-Jan-2010
Publisher: Elsevier Ltd.
Citation: European journal of pain, 14(7), pp.719-724; 2010
Abstract: 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 30min 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 1day 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.
Keywords: Delayed-onset muscle soreness / Eccentric exercise / Jaw muscle / Sensitization / Summation ratio / Temporal summation
URI: http://hdl.handle.net/10069/22721
ISSN: 10903801
DOI: 10.1016/j.ejpain.2009.12.001
PubMed ID: 20047846
Rights: Copyright © 2009 European Federation of International Association for the Study of Pain Chapters Published by Elsevier Ltd.
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/22721

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