Dual x-ray absorptiometry, bioelectrical impedance, and near infrared interactance in obese women


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Abstract

PANOTOPOULOS, G., J. C. RUIZ, B. GUY-GRAND, and A. BASDEVANT. Dual x-ray absorptiometry, bioelectrical impedance, and near infrared interactance in obese women. Med. Sci. Sports Exerc., Vol. 33, No. 4, 2001, pp. 665–670. Purpose:Whether the evaluation of body composition in obese people using low-cost, simple bedside, two-compartment techniques reflects the data obtained by indirect methods such as dual x-ray absorptiometry (DEXA) remains controversial. The aim of this study was to compare the data obtained by three methods of assessment of body composition (DEXA; bioelectrical impedance, BIA; and near infrared interactance, NII). Method:Data on body composition obtained in 53 obese women by these three methods were compared, using the Bland and Altman procedure to test the relative validity. Results:Although the correlation coefficients between DEXA and the two other methods were high, there were some major differences (limits of agreement) between data concerning fat and lean mass. Conclusions:The present study indicates that these methods cannot be considered as interchangeable and raises some questions on the use of BIA and NII as a single method of evaluation of body composition in clinical research and practice in obese populations.

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