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Dual energy X-ray absorptiometry body composition and aging in a population-based older cohort


Shaw, KA and Srikanth, VK and Fryer, JL and Blizzard, L and Dwyer, T and Venn, AJ, Dual energy X-ray absorptiometry body composition and aging in a population-based older cohort, International Journal of Obesity, 31, (2) pp. 279-284. ISSN 0307-0565 (2007) [Refereed Article]

DOI: doi:10.1038/sj.ijo.0803417


Objective: The aims of this cross-sectional study were (1) to examine the effect of age on body composition in older adults using dual-energy X-ray absorptiometry (DXA) and (2) to evaluate the agreement of DXA with standard indirect anthropometric measures (body mass index (BMI), waist circumference and waist-to-hip ratio (WHR)). Research methods and procedures: A population-based sample of 731 adults aged between 50 and 79 years underwent measurement of BMI, waist circumference, WHR, DXA total body fat mass, DXA % total body fat, DXA % trunk fat and DXA lean body mass. Linear regression was used to test for trend in measures of body composition between age categories in men and women. Partial correlations and Bland-Altman analysis were used to examine the agreement of DXA measures with indirect measures. Results: DXA lean body mass decreased significantly with increasing age in both sexes (P<0.05). In males, BMI (P=0.01) and body weight (P<0.01) decreased with age, and in females, WHR (P=0.05), DXA % total fat (P=0.02) and DXA % trunk fat (P=0.05) increased with age. There was good agreement between DXA measures of fatness and indirect anthropometric measures, except for WHR, which showed greater variability in its comparisons with DXA. Conclusion: Using the highly sensitive and direct DXA method of measuring body composition, a decline in lean body mass and an increase in adiposity was observed with aging. Except for WHR, indirect anthropometric measures generally showed high levels of agreement with DXA fat measures in this older cohort. © 2007 Nature Publishing Group All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Health Sciences
Research Group:Epidemiology
Research Field:Epidemiology not elsewhere classified
Objective Division:Health
Objective Group:Specific population health (excl. Indigenous health)
Objective Field:Health related to ageing
UTAS Author:Shaw, KA (Dr Kelly Shaw)
UTAS Author:Srikanth, VK (Dr Velandai Srikanth)
UTAS Author:Blizzard, L (Professor Leigh Blizzard)
UTAS Author:Venn, AJ (Professor Alison Venn)
ID Code:50493
Year Published:2007
Web of Science® Times Cited:34
Deposited By:Menzies Institute for Medical Research
Deposited On:2007-08-01
Last Modified:2012-12-12

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