Body water distribution in severe obesity and its assessment from eight-polar bioelectrical impedance analysis

A. Sartorio, M. Malavolti, F. Agosti, P. G. Marinone, O. Caiti, N. Battistini, Giorgio Bedogni

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To measure body water distribution and to evaluate the accuracy of eight-polar bioelectrical impedance analysis (BIA) for the assessment of total body water (TBW) and extracellular water (ECW) in severe obesity. Design: Cross-sectional study. Setting: Obesity clinic. Subjects: In all, 75 women aged 18-66y, 25 with body mass index (BMI) between 19.1 and 29.9 kg/m2 (ie not obese), 25 with BMI between 30.0 and 39.9 kg/m2 (ie class I and II obese), and 25 with BMI between 40.0 and 48.2 kg/m2 (ie class III obese). Methods: TBW and ECW were measured by 2H20 and Br dilution. Body resistance (R) was obtained by summing the resistances of arms, trunk and legs as measured by eight-polar BIA (InBody 3.0, Biospace, Seoul, Korea). The resistance index at a frequency of x kHz (RIx) was calculated as height 2/Rx. Results: ECW : TBW was similar in women with class III (46 ± 3%, mean ± s.d.) and class I-II obesity (45 ± 3%) but higher than in nonobese women (39 ± 3%, P500 explained 82% of TBW variance (Ps explained 87% of ECW variance (P2. Eight-polar BIA offers accurate estimates of TBW and ECW in women with a wide range of BMI (19.1-48.2 kg/m2) without the need of population-specific formulae.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalEuropean Journal of Clinical Nutrition
Volume59
Issue number2
DOIs
Publication statusPublished - Feb 2005

Keywords

  • Bioelectrical impedence analysis
  • Extracellular water
  • Obesity
  • Total body water

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Food Science

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