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Validity of Bioelectrical Impedance Analysis for Measuring Changes in Body Water and Percent Fat After Bariatric Surgery
Authors:Elizabeth M. Widen  Gladys Strain  Wendy C. King  Wenwen Yu  Susan Lin  Bret Goodpaster  John Thornton  Anita Courcoulas  Alfons Pomp  Dympna Gallagher
Affiliation:1. Institute of Human Nutrition and Department of Epidemiology, Columbia University, New York Obesity Nutrition Research Center, St. Luke’s-Roosevelt Hospital, 1111 Amsterdam Avenue, Scrymser Bsmt, New York, NY, 10025, USA
2. Department of Surgery, Weill Cornell Medical College, 525 East 68th Street, Starr 8, New York, NY, 10065, USA
3. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, 517 Parran Hall, Pittsburgh, PA, 15261, USA
4. New York Obesity Nutrition Research Center, St. Luke’s-Roosevelt Hospital, 1111 Amsterdam Avenue, Scrymser Bsmt, New York, NY, 10025, USA
5. Center for Family and Community Medicine, Columbia University, New York Obesity Nutrition Research Center, St. Luke’s-Roosevelt Hospital, 1111 Amsterdam Avenue, Scrymser Bsmt, New York, NY, 10025, USA
6. Diabetes and Obesity Research Center, Sanford Burnham Medical Research Institute, 6400 Sanger Road, Orlando, FL, 32827, USA
7. Division of Surgery, University of Pittsburgh Medical Center, 200 Lothrop St., Pittsburgh, PA, 15213, USA
8. New York Obesity Nutrition Research Center, Body Composition Unit, St. Luke’s-Roosevelt Hospital, Institute of Human Nutrition, Columbia University, 1111 Amsterdam Avenue, Scrymser Basement, New York, NY, 10025, USA
Abstract:

Background

Few studies have validated bioelectrical impedance analysis (BIA) following bariatric surgery.

Methods

We examined agreement of BIA (Tanita 310) measures of total body water (TBW) and percent body fat (%fat) before (T0) and 12 months (T12) after bariatric surgery, and change between T0 and T12 with reference measures: deuterium oxide dilution for TBW and three-compartment model (3C) for %fat in a subset of participants (n?=?50) of the Longitudinal Assessment of Bariatric Surgery-2.

Results

T0 to T12 median (IQR) change in deuterium TBW and 3C %fat was ?6.4 L (6.4 L) and ?14.8 % (13.4 %), respectively. There were no statistically significant differences between deuterium and BIA determined TBW [median (IQR) difference: T0 ?0.1 L (7.1 L), p?=?0.75; T12 0.2 L (5.7 L), p?=?0.35; Δ 0.35 L(6.3 L), p?=?1.0]. Compared with 3C, BIA underestimated %fat at T0 and T12 [T0 ?3.3 (5.6), p?p?=?0.04] but not change [0.7 (8.2), p?=?0.38]. Except for %fat change, Bland-Altman plots indicated no proportional bias. However, 95 % limits of agreement were wide (TBW 15–22 L, %fat 19–20 %).

Conclusions

BIA may be appropriate for evaluating group level response among severely obese adults. However, clinically meaningful differences in the accuracy of BIA between individuals exist.
Keywords:
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