Differences in Multiple Segment Tremor Dynamics Between Young and Elderly Persons

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Title Differences in Multiple Segment Tremor Dynamics Between Young and Elderly Persons
Author Morrison, Steven; Mills, Peter; Barrett, Rod
Journal Name Journal of Gerontology, Series A: Biological Sciences and Medical Sciences
Year Published 2006
Place of publication Washington, D.C.
Publisher Gerontological Society of America
Abstract Background. Physiological tremor is an intrinsic and highly variable motor output that is sensitive to alteration in both neuromuscular function and/or changing task demands. Given that any tremor increase can severely influence fine motor performance, there is a requirement to clarify what factors lead to increased tremor. Identification of those factors that alter tremor may be particularly pertinent for elderly persons, who often exhibit a decline in postural control and amplified tremor. The aim of this study was to examine the effect of whole body posture (seated vs standing) on multiple segment tremor and forearm electromyogram (EMG) activity of younger and older individuals. Methods. Fourteen older and 12 young participants performed a bilateral pointing task. Tremor data were collected using accelerometers attached to the forearm, hand, and finger segments of each arm. Surface EMG data were also collected from the extensor digitorum muscle of each arm. Results. Although the pattern of tremor was similar between age groups, older participants exhibited increased hand and finger tremor amplitude and increased EMG activity across all postural conditions. For older individuals, tremor increases were greatest when the participant performed the task in a standing position. All age-related increases in hand and/or finger tremor were confined to increases in peak power between 8 Hz and 12 Hz. Conclusions. From a clinical perspective, these findings illustrate that using multiple segment tremor analyses can provide additional insight into potential age-related tremor differences. Additionally, the fact that postural position had a pronounced effect on tremor in older individuals suggests that body posture should be considered as a potential confounding factor when assessing tremor differences between population groups.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.gerontologyjournals.org/
Copyright Statement Copyright 2006 Gerontological Society of America. Self-archiving of the author-manuscript version is not yet supported by this publisher. Please refer to the journal link for access to the definitive, published version or contact the author for more information.
Volume 61A
Issue Number 9
Page from 982
Page to 990
ISSN 1079-5006
Date Accessioned 2006-12-04
Language en_AU
Research Centre Griffith Health Institute; Centre for Musculoskeletal Research
Faculty Griffith Health Faculty
Subject Central Nervous System; Motor Control
URI http://hdl.handle.net/10072/14207
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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