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

Jeremy B. Ducharme
Jeremy B. Ducharme
, 
Holly Hall
Holly Hall
, 
Zachary J. Fennel
Zachary J. Fennel
, 
Avadney Gerard-Osbourne
Avadney Gerard-Osbourne
, 
Jonathan M. Houck
Jonathan M. Houck
, 
Chloe Clark
Chloe Clark
 und 
Ann L. Gibson
Ann L. Gibson
   | 08. Jan. 2023
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Online veröffentlicht: 08. Jan. 2023
Seitenbereich: 96 - 105
Eingereicht: 13. Okt. 2022
DOI: https://doi.org/10.2478/joeb-2022-0014
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© 2022 Jeremy B. Ducharme, Holly Hall, Zachary J. Fennel, Avadney Gerard-Osbourne, Jonathan M. Houck, Chloe Clark, and Ann L. Gibson, published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

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)

Variable Time since transitioning from a vertical to a supine position
0 min 5 min 10 min 15 min
R (Ω) 553.2±90 554.1±91 556.9±92 560.4±93*
Xc (Ω) 68.2±7.8 68.4±8.1 68.9±8.1* 69.6±8.1*
ICW (L) 20.9±4.8 20.9±4.8 20.8±4.8* 20.7±4.8*
ECW (L) 16.5±2.9 16.5±2.9 16.4±2.9* 16.3±2.9*
TBW (L) 37.4±7.5 37.4±7.6 37.2±7.6* 37.0±7.6*
PhA (°) 7.13±0.9 7.14±0.9 7.16±0.9 7.18±0.9
BF (%) 22.4±6.8 22.4±6.8 22.5±6.8* 22.5±6.8*

Participant demographics (mean ± SD).

Men (n=16) Women (n=22) Total (N=38)
Age (years) 24.2 ± 3.9 22.8 ± 4.3 23.4 ±4.1
Height (cm) 177.7 ± 4.7 167.7 ± 9.0 171.9 ± 8.9
Body Mass (kg) 78.9 ± 10.2 65.0 ± 12.1 70.9 ± 13.2
Body Mass Index (kg/m2) 25.0 ± 4.6 23.1 ± 1.5 23.8 ± 3.3
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Sprache:
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Technik, Bioingenieurwesen, Biomedizinische Elektronik, Biologie, Biophysik, Medizin, Biomedizinische Technik, Physik, Spektroskopie und Metrologie
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