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Ambulatory Activity, Body Composition, and Lower-Limb Muscle Strength in Older Adults
Citation
Scott, D and Blizzard, L and Fell, J and Jones, G, Ambulatory Activity, Body Composition, and Lower-Limb Muscle Strength in Older Adults, Medicine and Science in Sports and Exercise, 41, (2) pp. 383-389. ISSN 0195-9131 (2009) [Refereed Article]
DOI: doi:10.1249/MSS.0b013e3181882c85
Abstract
SCOTT, D., L. BLIZZARD, J. FELL, and G. JONES. Ambulatory Activity, Body Composition, and Lower-Limb Muscle Strength in Older Adults. Med. Sci. Sports Exerc., Vol. 41, No. 2, pp. 383389, 2009. Purpose: It is unclear how the amount of ambulatory activity
(AA) participated in by older adults relates to body composition or leg strength. The aim of this study was to describe associations of
pedometer-determined AA with body fat and leg muscle parameters in community-dwelling 50- to 79-yr-olds. Methods: A crosssectional
study of 982 randomly recruited subjects was conducted (51% female; mean age = 62 T 7 yr). Dual-energy x-ray absorptiometry
measured body composition, including total body fat, trunk fat, and leg lean mass. Isometric strength of the quadriceps and
hip flexors was measured using a dynamometer. Leg muscle quality was calculated as kilograms of leg strength per kilogram of leg lean
mass. Individual AA was recorded over seven d using a pedometer. Results: Average AA was 9622 T 4004 steps per day. There was no
evidence of a threshold model between AA and body fat, leg lean mass, or leg strength. Multivariable regression analyses adjusting for
age revealed that AA was negatively associated with total body fat (overall A = j0.54, P G 0.001; partial R2 = 0.06) and trunk fat mass
(overall A = j0.28, P G 0.001; partial R2 = 0.05). In women only, a significant positive association between AA and both leg strength
(A = 0.71, P = 0.016; partial R2 = 0.01) and leg muscle quality (A = 0.08, P = 0.001; partial R2 = 0.02) was observed. Conclusions:
These results suggest that pedometer-determined AA is a major determinant of body fat in community-dwelling older adults and is also
involved in the maintenance of leg strength and muscle quality in older women.
Item Details
Item Type: | Refereed Article |
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Keywords: | Aging, Body Fat, Leg Strength, Pedometer |
Research Division: | Biomedical and Clinical Sciences |
Research Group: | Clinical sciences |
Research Field: | Geriatrics and gerontology |
Objective Division: | Health |
Objective Group: | Specific population health (excl. Indigenous health) |
Objective Field: | Health related to ageing |
UTAS Author: | Scott, D (Mr David Scott) |
UTAS Author: | Blizzard, L (Professor Leigh Blizzard) |
UTAS Author: | Fell, J (Associate Professor James Fell) |
UTAS Author: | Jones, G (Professor Graeme Jones) |
ID Code: | 58902 |
Year Published: | 2009 |
Web of Science® Times Cited: | 29 |
Deposited By: | Menzies Institute for Medical Research |
Deposited On: | 2009-11-04 |
Last Modified: | 2010-04-15 |
Downloads: | 0 |
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