Document Detail

Physiological tremor in human jaw-muscle system.
MedLine Citation:
PMID:  9569990     Owner:  NLM     Status:  MEDLINE    
Small, quasi-rhythmical tremor of the jaw occurs at rest and during voluntary movements. In peripheral limbs, tremor consists of a component due to mechanical resonance properties of the system, and a neurogenic component mediated by a central pacemaker or neural loops. The present study attempted to determine if these components were present in jaw tremor measured with a position transducer held lightly between the incisors. When weights were suspended from the mandible, the tremor frequency was unaltered; sharp taps delivered to the jaw did not elicit any kind of damped oscillations of the system. These findings indicated the absence of mechanical resonance in the system. No correlation of the tremor signal with the electrocardiogram was found. However, a strong correlation was found between the rectified electromyographic signals recorded over the masseter muscles and the tremor signal, where the electromyographic signal preceded jaw movement by 20-30 msec. Frequency-domain analysis also showed positive peaks in a majority of coherence functions between electromyographic and tremor signals. These results suggested a strong neurogenic component of the tremor.
D Junge; J R Rosenberg; D M Halliday
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Archives of oral biology     Volume:  43     ISSN:  0003-9969     ISO Abbreviation:  Arch. Oral Biol.     Publication Date:  1998 Jan 
Date Detail:
Created Date:  1998-07-07     Completed Date:  1998-07-07     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0116711     Medline TA:  Arch Oral Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  45-54     Citation Subset:  D; IM    
School of Dentistry, University of California, Los Angeles 90095, USA.
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MeSH Terms
Masseter Muscle / innervation,  physiopathology*
Middle Aged
Muscle Contraction / physiology
Neural Pathways / physiology
Rest / physiology
Stress, Mechanical
Tremor / physiopathology*

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