Total body water and water compartments assessment in athletes: Validity of multi-frequency bioelectrical impedance

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Matias, CN (Author) Other; Noujeimi, FA (Author) Other; Sardinha, LB (Author) Other; Teixeira, Vitor Hugo (Author) FCNAUP; Silva, AM (Author) Other

Journal

Title: Science & Sports

Vol. 34

Pages: E307-E313

ISSN: 0765-1597

Publisher: ScienceDirect - Elsevier

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 3 Citations

Other information

Authenticus ID: P-00Q-0WM

DOI: 10.1016/j.scispo.2018.11.007

Abstract (EN): Bioelectrical impedance provides an affordable assessment of the body's water compartments: total body water (TBW), extracellular (ECW) and intracellular water (ICW). However, little is known of its validity in athletes. We aim to validate TBW, ECW, and ICW obtained by multi-frequency bioelectrical impedance (MFBIA), using dilution techniques as reference (REF) in athletes. Thirty-six elite athletes (17males and 19females) with a mean age of 18.5 +/- 4.1 years were evaluated. TBW, ECW, and ICW were assessed by MFBIA (Tanita MC-180MA) and dilution techniques. TBWREF and ECWREF were obtained by deuterium and bromide dilution techniques, respectively, while ICWREF was calculated as their difference. MFBIA underestimated ECW (similar to 1.3 kg) and overestimated TBW (similar to 1 kg) and ICW (similar to 3.5 kg), in relation to criterion. MFBIA explained 96%, 81%, and 83% of the total variability of results obtained from the reference for TBW, ECW, and ICW respectively. Standard error of the estimates ranged between 1.6 kg (ECW) and 2.9 kg (ICW). Bland-Altman analyses revealed 95% confidence intervals: -3.1 to 5.1 kg for TBW, -5.0 to 2.3 kg for ECW, and -2.5 to 9.6 kg for ICW. Although methods are highly associated, these findings highlight that the MFBIA used is of limited accuracy at an individual level to estimate TBW, ECW and ICW, in an athletic population.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7