Comparing Device-Generated and Calculated Bioimpedance Variables in Community-Dwelling Older Adults

Overview

Journal Sensors (Basel)

Publisher MDPI

Specialty Biotechnology

Date 2024 Sep 14

PMID 39275537

Authors

Kworweinski Lafontant

Danielle A Sterner

David H Fukuda

Jeffrey R Stout

Joon-Hyuk Park

Ladda Thiamwong

Affiliations

Soon will be listed here.

Abstract

Despite BIA emerging as a clinical tool for assessing older adults, it remains unclear how to calculate whole-body impedance (Z), reactance (Xc), resistance (R), and phase angle (PhA) from segmental values using modern BIA devices that place electrodes on both sides of the body. This investigation aimed to compare both the whole-body and segmental device-generated phase angle (PhA) with the phase angle calculated using summed Z, Xc, and R from the left, right, and combined sides of the body (PhA) and to compare bioelectric variables between sides of the body. A sample of 103 community-dwelling older adults was assessed using a 50 kHz direct segmental multifrequency BIA device. Whole-body PhA values were assessed for agreement with PhA using 2.5th and 97.5th quantile nonparametric limits of agreement and Spearman's rho. Bioelectrical values between sides of the body were compared using Wilcoxon rank and Spearman's rho. A smaller mean difference was observed between PhA and right PhA (-0.004°, = 0.26) than between PhA on the left (0.107°, = 0.01) and on the combined sides (0.107°, < 0.001). The sum of Z, R, and PhA was significantly different ( < 0.01) between the left (559.66 ± 99.55 Ω, 556.80 ± 99.52 Ω, 5.51 ± 1.5°, respectively) and the right sides (554.60 ± 94.52 Ω, 552.02 ± 94.23 Ω, 5.41 ± 0.8°, respectively). Bilateral BIA values do not appear to be interchangeable when determining whole-body measurements. Present data suggest that using right-sided segmental values would be the most appropriate choice for calculating whole-body bioelectrical variables.

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