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Prospective associations between ambulatory activity, body composition and muscle function in older adults

journal contribution
posted on 06.12.2017, 00:00 authored by David ScottDavid Scott, L Blizzard, J Fell, G Jones
To describe prospective associations between ambulatory activity (AA), body composition and muscle function in older adults, 697 community-dwelling participants (49% female; mean age = 62 ± 7 years) were assessed for changes in body fat and leg lean mass using dual-energy x-ray absorptiometry, leg strength using dynamometer, and whole body muscle quality (WBMQ; an estimate of specific force) over 2.6 ± 0.4 years. AA was negatively associated with fat mass in both sexes but baseline AA did not predict change in fat mass. Habitual AA was weakly, but significantly, negatively associated with change in total body fat (-0.16 kg/step x 10³/day, P=0.011) and trunk fat (-0.12 kg/step x 10³/day, P=0.044) in men.Habitual AA was also weakly, but significantly, positively associated with change in leg lean mass in both men and women (both P<0.05), as well as change in leg strength (1.37 kg/step x 10³/day, P=0.001) and WBMQ (0.03 kg/kg/step x 10³/day, P=0.002) in women only. Partial R²s for these associations were in the range of 1.2–3.2%. Although, these associations are modest, increases in objectively assessed physical activity may represent a target for improving body composition and muscle function in community-dwelling older adults.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

21

Issue

6

Start Page

161

End Page

175

Number of Pages

15

eISSN

1600-0838

ISSN

0905-7188

Location

United States

Publisher

Wiley-Blackwell Publishing, Inc.

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Menzies Research Institute; Not affiliated to a Research Institute;

Era Eligible

Yes

Journal

Scandinavian journal of medicine and science in sports.