Comparison of air-displacement plethysmography, hydrodensitometry, and dual X-ray absorptiometry for assessing body composition of children 10 to 18 years of age.
Body density (Db) of 54 boys and girls 10-18 years of age (13.9 +/- 2.4 years) was measured in an air-displacement plethysmograph, the BOD POD, and compared to Db determined by hydrodensitometry (HW). Both Db values were converted to percent body fat (%BF) using a two-component model conversion formula and compared to %BF determined by dual energy X-ray absorptiometry (DXA). Body density estimated from the BOD POD (1.04657 +/- 0.01825 g/cc) was significantly higher than that estimated from HW (1.04032 +/- 0.01872 g/cc). The relative body fat calculated from the BOD POD (23.12 +/- 8.39 %BF) was highly correlated but, on average, 2.9% BF lower than %BF DXA. Average %BF estimates from HW and DXA were not significantly different. Despite consistently underestimating the %BF of children, the strong relationship between DXA and the BOD POD suggests that further investigation may improve the accuracy of the BOD POD for assessing body composition in children.
Lockner
D W
DW
Center for Exercise and Applied Human Physiology, University of New Mexico, Albuquerque 87131, USA. dlockner@unm.edu
Heyward
V H
VH
Baumgartner
R N
RN
Jenkins
K A
KA
D015502:Absorptiometry, Photon / Q000379:methods*; D000293:Adolescent; D001823:Body Composition; D001835:Body Weight; D002648:Child; D003720:Densitometry / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D010991:Plethysmography / Q000379:methods*; D012016:Reference Values; D012044:Regression Analysis; D015203:Reproducibility of Results