Validation of bioelectrical-impedance analysis as a measurement of change in body composition in obesity.
The bioelectrical-impedance-analysis (BIA) method accurately measures body composition in weight-stable subjects. This study validates the use of BIA to measure change in body composition. Twelve obese females underwent weight loss at a mean rate of 1.16 kg/wk. Body composition was measured by deuterium oxide dilution (D2O), BIA, and skinfold anthropometry (SFA) at baseline and at 5% decrements in weight. Highly significant correlations were obtained between D2O and BIA (r = 0.971) and between D2O and SFA (r = 0.932). Overall, BIA predicted change in fat-free mass with greater accuracy (to 0.4 kg) and precision (+/- 1.28 kg) than did anthropometry (to 0.8 kg and +/- 2.58 kg, respectively). We conclude that BIA is a useful clinical method for measuring change in body composition.
Clinical Nutrition Research Unit, University of Chicago, IL.
R F
RF
Kushner
A
A
Kunigk
M
M
Alspaugh
P T
PT
Andronis
C A
CA
Leitch
D A
DA
Schoeller
D000328:Adult; D001823:Body Composition; D001834:Body Water; D004553:Electric Conductivity; D005260:Female; D006801:Humans; D008875:Middle Aged; D009765:Obesity / Q000503:physiopathology*; D011865:Radioisotope Dilution Technique; D015431:Weight Loss / Q000502:physiology*