Total body water changes after an exercise intervention tracked using bioimpedance spectroscopy : a deuterium oxide comparison

BACKGROUND & AIMS: Bioimpedance spectroscopy (BIS) for the estimation of total body water (TBW) has advantages over isotope dilution techniques, including cost, portability, and ease of use. The aim of the current study was to determine the validity of a BIS device (Imp SFB7) for tracking changes in overfat and obese individuals. METHODS: Sixty overfat and obese men and women (27+/-8 yr, 33.41+/-3.81út) participated in the study. TBW was estimated using BIS and deuterium oxide (D(2)O) before and after the ten-week intervention. RESULTS: Pre-and post-intervention BIS TBW estimations errors increased as body mass index (BMI), fat mass (FM), and fat-free mass (FFM) increased (p24). Employing a BIS TBW equation is suggested over the development of resistivity coefficients based on BMI, FM, FFM or age