Variations in truncal body circumferences affect fat mass quantification with bioimpedance analysis

Item Type:	Article
Title:	Variations in truncal body circumferences affect fat mass quantification with bioimpedance analysis
Creators Name:	Haas, V. and Engeli, S. and Hofmann, T. and Riedl, A. and Haufe, S. and Kast, P. and Wiesner, S. and Boehnke, J. and Jordan, J. and Boschmann, M.
Abstract:	Objective: To test the hypothesis that variations in trunk circumferences influence the accuracy of bioimpedance analysis (BIA) for assessment of percent fat mass (%FM). Subjects and Methods: %FM was predicted with BIA, and compared with air-displacement plethysmography (ADP) in a small sample of 35 overweight (OW), 21 normal weight and 8 underweight volunteers. Waist and hip circumferences were assessed, and 15 of the OW subjects were measured before and after weight reduction. Results: BIA and ADP provided similar cross-sectional estimates of group mean %FM (28.9±10.0 and 31.3±13.0%, respectively). However, within individuals, there were large between-method differences (Diff(BIA-ADP)) ranging from -13 to +13 %FM. Furthermore, we found a systematic bias of BIA related to the degree of adiposity. Consequently, %FM and fat mass loss during weight reduction in OW were underestimated with BIA when compared with ADP. Waist and hip circumferences were inversely associated with resistance (R) and reactance (P<0.01), and with Diff(BIA-ADP) (P<0.001). In women, the variability in hip circumference explained 76%, and in men, the variability in waist circumference explained 59% of Diff(BIA-ADP). Conclusion: Resistance changes associated with variations in trunk circumferences decrease resistance, and therefore impair the accuracy of BIA to assess %FM.
Keywords:	Adipose Tissue, Adiposity, Bias (Epidemiology), Body Composition, Body Mass Index, Cross-Sectional Studies, Electric Impedance, Hip, Overweight, Plethysmography, Reference Values, Sex Factors, Thinness, Waist Circumference, Weight Loss
Source:	European Journal of Clinical Nutrition
ISSN:	0954-3007
Publisher:	Nature Publishing Group
Volume:	66
Number:	2
Page Range:	196-200
Date:	February 2012
Official Publication:	https://doi.org/10.1038/ejcn.2011.154
PubMed:	View item in PubMed

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