Dual-energy X-ray absorptiometry and anthropometric estimates of visceral fat in Black and White South African Women.
Obesity (Silver Spring)
; 18(3): 619-24, 2010 Mar.
Article
in En
| MEDLINE
| ID: mdl-19763094
ABSTRACT
Visceral adipose tissue (VAT) is associated with increased risk for cardiovascular disease, and therefore, accurate methods to estimate VAT have been investigated. Computerized tomography (CT) is the gold standard measure of VAT, but its use is limited. We therefore compared waist measures and two dual-energy X-ray absorptiometry (DXA) methods (Ley and Lunar) that quantify abdominal regions of interest (ROIs) to CT-derived VAT in 166 black and 143 white South African women. Anthropometry, DXA ROI, and VAT (CT at L4-L5) were measured. Black women were younger (P < 0.001), shorter (P < 0.001), and had higher body fat (P < 0.05) than white women. There were no ethnic differences in waist (89.7 +/- 18.2 cm vs. 90.1 +/- 15.6 cm), waistheight ratio (WHtR, 0.56 +/- 0.12 vs. 0.54 +/- 0.09), or DXA ROI (Ley 2.2 +/- 1.5 vs. 2.1 +/- 1.4; Lunar 2.3 +/- 1.4 vs. 2.3 +/- 1.5), but black women had less VAT, after adjusting for age, height, weight, and fat mass (76 +/- 34 cm(2) vs. 98 +/- 35 cm(2); P < 0.001). Ley ROI and Lunar ROI were correlated in black (r = 0.983) and white (r = 0.988) women. VAT correlated with DXA ROI (Ley r = 0.729 and r = 0.838, P < 0.01; Lunar r = 0.739 and r = 0.847, P < 0.01) in black and white women, but with increasing ROI android fatness, black women had less VAT. Similarly, VAT was associated with waist (r = 0.732 and r = 0.836, P < 0.01) and WHtR (r = 0.721 and r = 0.824, P < 0.01) in black and white women. In conclusion, although DXA-derived ROIs correlate well with VAT as measured by CT, they are no better than waist or WHtR. Neither DXA nor anthropometric measures are able to accurately distinguish between high and low levels of VAT between population groups.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Absorptiometry, Photon
/
Anthropometry
/
Intra-Abdominal Fat
/
Adiposity
/
Waist Circumference
/
Obesity, Abdominal
Limits:
Adolescent
/
Adult
/
Female
/
Humans
/
Middle aged
Country/Region as subject:
Africa
Language:
En
Journal:
Obesity (Silver Spring)
Journal subject:
CIENCIAS DA NUTRICAO
/
FISIOLOGIA
/
METABOLISMO
Year:
2010
Type:
Article
Affiliation country:
South Africa