Age-related loss of muscle mass, strength, and power and their association with mobility in recreationally-active older adults in the United Kingdom

MADEN-WILKINSON, Tom, MCPHEE, Jamie S, JONES, David A and DEGENS, Hans (2015). Age-related loss of muscle mass, strength, and power and their association with mobility in recreationally-active older adults in the United Kingdom. Journal of aging and physical activity, 23 (3), 352-360.

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Official URL: https://journals.humankinetics.com/doi/abs/10.1123...
Link to published version:: https://doi.org/10.1123/japa.2013-0219

Abstract

To investigate reasons for the age-related reduction in physical function, we determined the relationships between muscle size, strength, and power with 6-min walk distance (6MWD) and timed up-and-go performance in 49 young (23 ± 3.1 years) and 66 healthy, mobile older adults (72 ± 5 years). While muscle mass, determined by DXA and MRI, did not correlate with performance in the older adults, power per body mass, determined from a countermovement jump, did correlate. The 40% lower jumping power observed in older adults (p < .05) was due to a lower take-off velocity, which explained 34% and 42% of the variance in 6MWD in older women and men, respectively (p < .01). The lower velocity was partly attributable to the higher body mass to maximal force ratio, but most was due to a lower intrinsic muscle speed. While changes in muscle function explain part of the age-related reduction in functional performance, ~60% of the deficit remains to be explained.

Item Type: Article
Research Institute, Centre or Group: Centre for Sport and Exercise Science
Identification Number: https://doi.org/10.1123/japa.2013-0219
Depositing User: Tom Maden-Wilkinson
Date Deposited: 10 Jan 2018 13:22
Last Modified: 15 Jan 2018 14:32
URI: http://shura.shu.ac.uk/id/eprint/17528

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