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Aging and Motor Variability across Timescales
Jacob J. Sosnoff,Jean M. Samson,Sung-Hoon Shin 한국체육학회 2009 International journal of human movement science Vol.3 No.2
Older adults are more variable in their movement than their younger counterparts. Variability occurs across multiple timescales. It has been speculated that different processes contribute to motor variability at unique timescales. It is possible that variability at different timescales may provide unique information about the influence of aging on the sensorimotor system. The purpose of the current investigation is to examine the influence of aging on motor variability across multiple timescales. In order to examine this question,seventy-eight individuals (37 young and 41 old) produced sub-maximal isometric force output five times a day for five consecutive days. Within trial variability was quantified with coefficient of variation. Across trial variability was indexed as the standard deviation of individual trial CV. Across day variability was indexed as the standard deviation of the across trial variability. Overall, older adults were found to have greater within trial, across trial and across day variability compared to young adults. Variability was found to be associated across all the timescales of investigation. Older adults were found to have stronger associations between within trial variability across sessions. The findings are supportive of the notion that older adults are less adaptable in their motor output. Further research is needed to better understand the mechanisms driving age-related differences in motor variability across timescales.
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