Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/3081
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Type: Journal article
Title: Pulsatile control of the human masticatory muscles
Author: Jaberzadeh, S.
Brodin, P.
Flavel, S.
O'Dwyer, N.
Nordstrom, M.
Miles, T.
Citation: The Journal of Physiology, 2003; 547(2):613-620
Publisher: Cambridge Univ Press
Issue Date: 2003
ISSN: 0022-3751
1469-7793
Statement of
Responsibility: 
Shapour Jaberzadeh, Pål Brodin, Stanley C. Flavel, Nicholas J. O'Dwyer, Michael A. Nordstrom, Timothy S. Miles
Abstract: Spectral analysis of jaw acceleration confirmed that the human mandible ‘trembles’ at a peak frequency around 6 Hz when held in its rest position and at other stationary jaw openings. The 6 Hz tremor increased during very slow movements of the mandible, but other lower-frequency peaks became prominent during more rapid jaw movements. These lower-frequency peaks are likely to be the result of asymmetries in the underlying, voluntarily produced, ‘saw-tooth’ movements. In comparison, finger tremor at rest and during slow voluntary movements had a mean peak frequency of about 8 Hz: this frequency did not change during rhythmical finger flexion and extension movements, but the power of the tremor increased non-linearly with the speed of the movement. The resting jaw tremor was weakly coherent with the activity of the masseter and digastric muscles at the tremor frequency in about half the subjects, but was more strongly coherent during voluntary movements in all subjects. The masseter activity was at least 150 deg out of phase with the digastric activity at the tremor frequency (and at all frequencies from 2.5–15 Hz). The alternating pattern of activity in antagonistic muscles at rest and during slow voluntary movements supports the idea that the masticatory system is subject to pulsatile control in a manner analogous to that seen in the finger.
Keywords: Fingers
Muscle, Skeletal
Masticatory Muscles
Jaw
Humans
Oscillometry
Periodicity
Posture
Movement
Rest
Description: The definitive version is available at www.blackwell-synergy.com
Rights: © 2003 The Physiological Society
DOI: 10.1113/jphysiol.2003.030221
Published version: http://dx.doi.org/10.1113/jphysiol.2003.030221
Appears in Collections:Aurora harvest 6
Molecular and Biomedical Science publications

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