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ORIGINAL RESEARCH COMMUNICATION |
1 From the School of Physical and Health Education (JLK, SL, and RR) and the Department of Medicine, Division of Endocrinology and Metabolism (RR), Queen's University, Kingston, Canada, and the Obesity Research Center, St Luke's–Roosevelt Hospital, Columbia University College of Physicians and Surgeons, New York, NY (SBH)
Background: The influence of age and sex on the distribution of abdominal adipose tissue for a given waist circumference (WC) is unclear.
Objective: The objective was to investigate the influence of age and sex on total (TAAT), visceral (VAT), and abdominal subcutaneous (ASAT) adipose tissue for a given WC.
Design: Body composition was assessed by whole-body magnetic resonance imaging in 147 younger men (< 50 y), 83 older men, 171 younger (premenopausal) women, and 80 older (postmenopausal) women with a wide range (16–40; in kg/m2) of body mass indexes.
Results: Within each sex, the regression lines between WC and TAAT were not significantly different (P > 0.1) between younger and older groups. Collapsed across age groups, women had more TAAT for a given WC than did men; however, this difference was significantly reduced with increasing WC (P < 0.05). Within each sex, regression lines derived for WC and ASAT were not significantly different between younger and older groups (P > 0.1). Collapsed across age groups, women had 1.8 kg more ASAT for a given WC (P < 0.05) than did men across the range of WCs. Within each sex, older men and women had a significantly greater increase in VAT for a given WC (P < 0.05) than did younger men and women. Furthermore, independent of age group, the slopes for WC and VAT were significantly higher (P < 0.05) in men than in women.
Conclusions: There are significant sex differences in TAAT, VAT, and ASAT for a given WC. Furthermore, the relation between WC and VAT is substantially influenced by age.
Key Words: Visceral fat • abdominal subcutaneous fat • sex • menopause • age • magnetic resonance imaging
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