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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:
Open Access
|Jan 2023

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).
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).
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).
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.
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.
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.
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 times 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.

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