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Worth the wait? Time course of supine shifts in body water compartments on variables of bioelectrical impedance analysis Cover

Worth the wait? Time course of supine shifts in body water compartments on variables of bioelectrical impedance analysis

Journal of Electrical Bioimpedance
Volume 13 (2022): Issue 1 (January 2022)
By: Jeremy B. Ducharme,  Holly Hall,  Zachary J. Fennel,  Avadney Gerard-Osbourne,  Jonathan M. Houck,  Chloe Clark and  Ann L. Gibson  
Open Access
|Jan 2023
Figures & tables

Figures & Tables

Fig. 1

Effect of time since transitioning from a vertical to a supine position on resistance (A), and reactance (B) over 15 minutes as assessed via the RJL Quantum Legacy analyzer (N=38). Open circles represent individual responses. *Denotes a statistically significant increase from baseline over the course of 15-minutes resting in a supine position (p<0.05).

Fig. 2

Effect of time since transitioning from a vertical to a supine position on intracellular water (A), extracellular water (B), and total body water (C) over 15 minutes as assessed via the RJL Quantum Legacy analyzer (N=38). Open circles represent individual responses. *Denotes a statistically significant decrease from baseline over the course of 15-minutes resting in a supine position (p<0.05).

Fig. 3

Effect of time since transitioning from a vertical to a supine position on phase angle (A), and body fat percentage (B) over 15 minutes as assessed via the RJL Quantum Legacy analyzer (N=38). Open circles represent individual responses. *Denotes a statistically significant increase from baseline over the course of 15-minutes resting in a supine position (p<0.05).

Fig. 4

Bland and Altman plots of individual differences for the effect of time since transitioning from a vertical to a supine position on reactance (left side) and resistance (right side) (N = 38). The solid line represents a mean difference (bias) of zero. The dashed lines denote the upper and lower limits-of-agreement (bias ± [1.96×SD of the bias]). R2 represents the amount of variance explained by the average resistance or reactance. *p<0.05 significant systematic bias.

Fig. 5

Bland and Altman plots of individual differences for the effect of time since transitioning from a vertical to a supine position on intracellular water (ICW: left side), extracellular water (ECW: middle), and total body water (TBW: right side) (N = 38). The solid line represents a mean difference (bias) of zero. The dashed lines denote the upper and lower limits-of-agreement (bias ± [1.96×SD of the bias]). R2 represents the amount of variance explained by the average ICW, ECW, or TBW. *p<0.05 significant systematic bias.

Fig. 6

Bland and Altman plots of individual differences for the effect of time since transitioning from a vertical to a supine position on body fat (left side) and phase angle (right side) (N = 38). The solid line represents a mean difference (bias) of zero. The dashed lines denote the upper and lower limits-of-agreement (bias ± [1.96×SD of the bias]). R2 represents the amount of variance explained by the average value. *p<0.05 significant systematic bias.

Average bioelectrical variables as assessed by the RJL Quantum Legacy device (N=38)

VariableTime since transitioning from a vertical to a supine position
0 min5 min10 min15 min
R (Ω)553.2±90554.1±91556.9±92560.4±93*
Xc (Ω)68.2±7.868.4±8.168.9±8.1*69.6±8.1*
ICW (L)20.9±4.820.9±4.820.8±4.8*20.7±4.8*
ECW (L)16.5±2.916.5±2.916.4±2.9*16.3±2.9*
TBW (L)37.4±7.537.4±7.637.2±7.6*37.0±7.6*
PhA (°)7.13±0.97.14±0.97.16±0.97.18±0.9
BF (%)22.4±6.822.4±6.822.5±6.8*22.5±6.8*

Participant demographics (mean ± SD)_

Men (n=16)Women (n=22)Total (N=38)
Age (years)24.2 ± 3.922.8 ± 4.323.4 ±4.1
Height (cm)177.7 ± 4.7167.7 ± 9.0171.9 ± 8.9
Body Mass (kg)78.9 ± 10.265.0 ± 12.170.9 ± 13.2
Body Mass Index (kg/m2)25.0 ± 4.623.1 ± 1.523.8 ± 3.3
DOI: https://doi.org/10.2478/joeb-2022-0014 | Journal eISSN: 1891-5469
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Language: English
Page range: 96 - 105
Submitted on: Oct 13, 2022
Published on: Jan 8, 2023
Published by: University of Oslo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
BIA,
TBW,
ICW,
ECW,
body fat,
phase angle
Related subjects:
Engineering,
Bioengineering and biomedical engineering,
Biomedical electronics,
Life sciences,
Biophysics,
Medicine,
Biomedical engineering,
Physics,
Spectroscopy and metrology

© 2023 Jeremy B. Ducharme, Holly Hall, Zachary J. Fennel, Avadney Gerard-Osbourne, Jonathan M. Houck, Chloe Clark, Ann L. Gibson, published by University of Oslo
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 13 (2022): Issue 1 (January 2022)
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