A model-based approach for analysis of intracellular resistance variations due to body posture on bioimpedance measurements
Bioimpedance spectroscopy is a known option for measuring body fluid volume. However, it is prone to a variety of influence factors which prevent a wider use. One of these influencing factors is the body posture. It could be shown that the average intracellular resistance percentage changes when the...
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| Published in | Journal of physics. Conference series Vol. 434; no. 1; pp. 12003 - 4 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Bristol
IOP Publishing
01.01.2013
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1742-6588 1742-6596 |
| DOI | 10.1088/1742-6596/434/1/012003 |
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| Abstract | Bioimpedance spectroscopy is a known option for measuring body fluid volume. However, it is prone to a variety of influence factors which prevent a wider use. One of these influencing factors is the body posture. It could be shown that the average intracellular resistance percentage changes when the subject changes position from lying to standing. Most authors explain this phenomenon by fluid shifts. Another possible reason is the stray capacitance between the body and the ground, because if a certain fraction of the injected current follows other paths than between the potential electrodes, the result will be wrong. This paper analyses the influence of different body postures on the measured intracellular resistance and the posture depending capacity. For this purpose, FEM simulations are used. Subsequently, an electrical equivalent model with capacitances was developed. With this model, it is possible to correct the measured impedance and to neglect the influence of the stray capacitance. |
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| AbstractList | Bioimpedance spectroscopy is a known option for measuring body fluid volume. However, it is prone to a variety of influence factors which prevent a wider use. One of these influencing factors is the body posture. It could be shown that the average intracellular resistance percentage changes when the subject changes position from lying to standing. Most authors explain this phenomenon by fluid shifts. Another possible reason is the stray capacitance between the body and the ground, because if a certain fraction of the injected current follows other paths than between the potential electrodes, the result will be wrong. This paper analyses the influence of different body postures on the measured intracellular resistance and the posture depending capacity. For this purpose, FEM simulations are used. Subsequently, an electrical equivalent model with capacitances was developed. With this model, it is possible to correct the measured impedance and to neglect the influence of the stray capacitance. |
| Author | Leonhardt, Steffen Ulbrich, Mark Weyer, Sören |
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| Cites_doi | 10.1038/ki.1997.150 10.1109/TBME.2012.2216880 10.1088/0031-9155/41/11/003 10.1088/0967-3334/19/2/012 10.1111/j.1748-1716.1993.tb09573.x 10.1111/j.1748-1716.1995.tb09960.x 10.1109/TBME.2003.820338 10.1152/jappl.1998.85.2.497 10.1093/ajcn/64.3.423S |
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| DOI | 10.1088/1742-6596/434/1/012003 |
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| References | Kushner R F (1) 1996; 64 2 Weyer S (11) 2012 3 Hinghofer-Szalkay H (5) 1986; 250 6 7 9 Scharfetter H (10) 1998; 19 Gabriel S (8) 1996; 41 Zhu F (4) 1998; 85 |
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| Snippet | Bioimpedance spectroscopy is a known option for measuring body fluid volume. However, it is prone to a variety of influence factors which prevent a wider use.... |
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| SubjectTerms | Body fluids Capacitance Computational fluid dynamics Computer simulation Electrodes Equivalence Fluid flow Grounds Mathematical models Physics |
| Title | A model-based approach for analysis of intracellular resistance variations due to body posture on bioimpedance measurements |
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