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


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Shaw, K, Srikanth, VK, Fryer, JL, Blizzard, CL, Dwyer, T and Venn, AJ 2007 , 'Dual energy X-ray absorptiometry body composition and aging in a population-based older cohort' , International Journal of Obesity, vol. 31, No. 2 , pp. 279-284 , doi: 10.1038/sj.ijo.0803417.

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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
Results: DXA lean body mass decreased significantly with increasing age in both sexes (Po0.05). In males, BMI (P¼0.01) and
body weight (Po0.01) decreased with age, and in females, WHR (P¼0.05), DXA % total fat (P¼0.02) and DXA % trunk fat
(P¼0.05) 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.

Item Type: Article
Authors/Creators:Shaw, K and Srikanth, VK and Fryer, JL and Blizzard, CL and Dwyer, T and Venn, AJ
Keywords: body composition; DXA; epidemiology; population based; aging
Journal or Publication Title: International Journal of Obesity
Publisher: Nature Publishing Group
ISSN: 0307-0565
DOI / ID Number: 10.1038/sj.ijo.0803417
Additional Information:

© 2008 Nature Publishing Group

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