Prediction of body composition in premenopausal females from dual-energy X-ray absorptiometry.
Four methods for predicting body composition were compared in premenopausal females (n = 100), 28-39 yr old, by using underwater weighing (UWW) as the criterion method. The four methods were dual energy X-ray absorptiometry (DEXA), skinfolds, bioelectrical impedance, and body mass index. The sample had a mean percent fat (%fat) of 29.7 +/- 6.8% (SD) by DEXA and 29.9 +/- 5.8% measured by UWW. DEXA yielded a standard error of estimate (SE) of 2.4% (r = 0.91) for the prediction of %fat from UWW. When %fat was estimated from other methods, larger SEs were obtained: 3.0% for skin-folds, 3.3% for body mass index, and 2.9% for bioelectrical impedance (height2/resistance) plus weight. Individual body density values derived from UWW were corrected for bone mineral variation. DEXA predicted the corrected body density with a lower SE (0.0040 vs. 0.0053 g/ml) than the original density values. We conclude that DEXA was a precise method and correlated highly with fat-free body weight and %fat from UWW in this homogeneous female sample.
Hansen
N J
NJ
Department of Exercise and Sport Sciences, University of Arizona, Tucson 85721.
Lohman
T G
TG
Going
S B
SB
Hall
M C
MC
Pamenter
R W
RW
Bare
L A
LA
Boyden
T W
TW
Houtkooper
L B
LB
D015502:Absorptiometry, Photon; D000328:Adult; D001823:Body Composition / Q000502:physiology*; D001835:Body Weight / Q000502:physiology; D015519:Bone Density / Q000502:physiology; D001842:Bone and Bones / Q000033:anatomy & histology / Q000378:metabolism; D017097:Electric Impedance; D005260:Female; D006801:Humans; D050356:Lipid Metabolism; D012044:Regression Analysis; D012885:Skinfold Thickness