Body composition assessment in extreme obesity and after massive weight loss induced by gastric bypass surgery

Body composition methods were examined in 20 women [body mass index (BMI) 48.7 +/- 8.8 kg/m2] before and after weight loss [44.8 +/- 14.6 (SD) kg] after gastric bypass (GBP) surgery. The reference method, a three-compartment (3C) model using body density by air displacement plethysmography and total...

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Bibliographic Details
Published in:American journal of physiology: endocrinology and metabolism 2003-06, Vol.47 (6), p.E1080-E1088
Main Authors: SAI KRUPA DAS, ROBERTS, Susan B, KEHAYIAS, Joseph J, WANG, Jack, HSU, L. K, SHIKORA, Scott A, SALTZMAN, Edward, MCCRORY, Megan A
Format: Article
Language:English
Subjects:
Biological and medical sciences
Body fat
Fundamental and applied biological sciences. Psychology
Obesity
Stomach
Surgery
Weight control
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Summary:Body composition methods were examined in 20 women [body mass index (BMI) 48.7 +/- 8.8 kg/m2] before and after weight loss [44.8 +/- 14.6 (SD) kg] after gastric bypass (GBP) surgery. The reference method, a three-compartment (3C) model using body density by air displacement plethysmography and total body water (TBW) by H218O dilution (3C-H218O), showed a decrease in percent body fat (%BF) from 51.4 to 34.6%. Fat-free mass hydration was significantly higher than the reference value (0.738) in extreme obesity (0.756; P < 0.001) but not after weight reduction (0.747; P = 0.16). %BF by H218O dilution and air displacement plethysmography differed significantly from %BF by 3C-H218O in extreme obesity (P < 0.05) and 3C models using 2H2O or bioelectrical impedance analysis (BIA) to determine TBW improved mean %BF estimates over most other methods at both time points. BIA results varied with the equation used, but BIA better predicted %BF than did BMI at both time points. All methods except BIA using the Segal equation were comparable to the reference method for determining changes over time. A simple 3C model utilizing air displacement plethysmography and BIA is useful for clinical evaluation in this population. [PUBLICATION ABSTRACT]
ISSN:0193-1849
1522-1555