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Type: Journal article
Title: Mandibular physiological tremor is reduced by increasing - force ramp contractions and periodontal anaesthesia
Author: Sowman, P.
Brinkworth, R.
Turker, K.
Citation: Experimental Brain Research, 2008; 184(1):71-82
Publisher: Springer
Issue Date: 2008
ISSN: 0014-4819
Statement of
Paul F. Sowman, Russell S. A. Brinkworth and Kemal S. Türker
Abstract: We have previously shown that the application of anaesthesia to periodontal mechanoreceptors (PMRs) dramatically reduces the 6–12 Hz physiological tremor (PT) in the human mandible during constant isometric contractions where visual feedback is provided. This current study shows that during a ramp contraction where force is slowly increased, the amplitude of mandibular PT is almost five times smaller on average than when the same force ramp is performed in reverse, i.e. force is slowly decreased. This smaller tremor is associated with a higher mean firing rate of motor units (MUs) as measured by the sub-30 Hz peak in the multi-unit power spectrum. The decrease in the amplitude of PT following PMR anaesthetisation is associated in some instances with a similar increase in the overall firing rate; however this change does not match the diminution of tremor. The authors postulate that the decrease in mandibular PT during increasing force ramps may be due to a change in the mean firing rate of the MUs. The change in tremor seen during PMR anaesthetisation may in part be due to a similar mechanism; however other factors must also contribute to this.
Description: The original publication can be found at
RMID: 0020080004
DOI: 10.1007/s00221-007-1083-0
Appears in Collections:Molecular and Biomedical Science publications

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