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

journal contribution
posted on 06.12.2017, 00:00 authored by J Moon, A Smith, T Beck, J Stout, S Tobkin, C Lockwood, K Kendall, J Graef, M Roberts, Vincent DalboVincent Dalbo
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 (p<0.05). Delta values were more accurate than pre- and post-TBW estimations (total error=1.45 L). Age significantly influenced pre- and post-TBW errors (p<0.05). Therefore, a regression equation was developed to correct for the pre- and post-BIS-estimated TBW errors: D(2)O TBW=11.478+0.743(BIS TBW)-2.429(Gender), (Men=1, Women=2).CONCLUSIONS: BIS can be considered an accurate tool for tracking changes in TBW regardless of variations in BMI, FM, FFM, or age in both overfat and obese men and women (BMI>24). Employing a BIS TBW equation is suggested over the development of resistivity coefficients based on BMI, FM, FFM or age.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

28

Issue

5

Start Page

516

End Page

525

Number of Pages

10

eISSN

1532-1983

ISSN

0261-5614

Location

Netherlands

Publisher

Elsevier BV

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

University of Oklahoma;

Era Eligible

Yes

Journal

Clinical nutrition.