Increased gravitational force reveals the mechanical, resonant nature of physiological tremor

Journal article


Lakie, M., Vernooij, C. A., Osler, Callum J., Stevenson, A. T., Scott, J. P. R. and Reynolds, Raymond Francis 2015. Increased gravitational force reveals the mechanical, resonant nature of physiological tremor. The Journal of Physiology. https://doi.org/10.1113/JP270464
AuthorsLakie, M., Vernooij, C. A., Osler, Callum J., Stevenson, A. T., Scott, J. P. R. and Reynolds, Raymond Francis
Abstract

Human physiological hand tremor has a resonant component. Proof of this is that its frequency can be modified by adding mass. However, adding mass also increases the load which must be supported. The necessary force requires muscular contraction which will change motor output and is likely to increase limb stiffness. The increased stiffness will partly offset the effect of the increased mass and this can lead to the erroneous conclusion that factors other than resonance are involved in determining tremor frequency. Using a human centrifuge to increase head-to-foot gravitational field strength, we were able to control for the increased effort by increasing force without changing mass. This revealed that the peak frequency of human hand tremor is 99% predictable on the basis of a resonant mechanism. We ask what, if anything, the peak frequency of physiological tremor can reveal about the operation of the nervous system.

KeywordsTremor
Year2015
JournalThe Journal of Physiology
PublisherWiley
ISSN223751
Digital Object Identifier (DOI)https://doi.org/10.1113/JP270464
Web address (URL)http://hdl.handle.net/10545/619128
hdl:10545/619128
Publication dates10 Jan 2015
Publication process dates
Deposited31 Aug 2016, 13:15
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Archived with thanks to The Journal of Physiology

ContributorsUniversity of Birmingham, UK, Aix-Marseille Universite, Marseille, France, University of Derby, UK, QinetiQ, Farnborough, UK, King’s College London, UK, Wyle GmbH, Koln, Germany, School of Sport, Exercise and Rehabilitation Sciences; University of Birmingham; UK, School of Sport, Exercise and Rehabilitation Sciences; University of Birmingham; UK, School of Sport, Exercise and Rehabilitation Sciences; University of Birmingham; UK, QinetiQ Aircrew Systems, Air Division; QinetiQ; Farnborough UK, Wyle GmbH; Köln Germany and School of Sport, Exercise and Rehabilitation Sciences; University of Birmingham; UK
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