Agreement Between Body Composition Assessed by Bioelectrical Impedance Analysis and Doubly Labeled Water in Obese Women Submitted to Bariatric Surgery
Bariatric surgery has a significant influence on body composition (BC), which should be monitored. However, there is a need to recommend low-cost practical methods, with good estimation of BC for class III obese and/or bariatric patients.
The aim of this study was to determine accuracy and agreement between BC assessed by direct segmental multifrequency bioelectrical impedance analysis (DSM-BIA) and doubly labeled water (DLW) as reference method.
Material and Methods
Twenty class III obese women (age 29.3 ± 5.1 years; body mass index 44.8 ± 2.4 kg/m2) underwent Roux-en-Y gastric bypass surgery. BC (fat mass [FM], fat-free mass [FFM], and total body water [TBW]) was assessed by InBody 230 and DLW in the following periods: before and 6 and 12 months after surgery. Accuracy between the methods was evaluated by the bias and root mean square error. Pearson’s correlation, concordance correlation coefficient (CCC), and Bland-Altman method were used to evaluate agreement between the methods.
Correlations were significant (p < 0.001) and CCC was good/excellent between both methods for the evaluation of FM (r = 0.84–0.92, CCC = 0.84–0.95), FFM (r = 0.73–0.90, CCC = 0.68–0.80), and TBW (r = 0.76–0.91, CCC = 0.72–0.81) before and after bariatric surgery. In addition, no significant bias was observed between DSM-BIA and DLW for FM (mean error [ME] = − 1.40 to 0.06 kg), FFM (ME = 0.91–1.86 kg), and TBW (ME = 0.71–1.24 kg) measurements.
The DSM-BIA was able to estimate the BC of class III obese women submitted to bariatric surgery with values consistent with those of the DLW method.
KeywordsBody composition Bariatric surgery Bioimpedance analysis Total body water Fat mass Fat-free mass DSM-BIA
Compliance with Ethical Standards
The study protocol was approved by the Ethical Committee of the Medical School of Botucatu of the State University of São Paulo, UNESP. Informed consent was obtained from all participants included in the study. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Conflict of Interest
The authors declare that they have no conflict of interest.
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