Impedance plethysmography: measurements of volume changes of human limbs caused by capillary filtration
Stick, C.
European Journal of Applied Physiology and Occupational Physiology 47(4): 405-418
1981
ISSN/ISBN: 0301-5548 PMID: 7199443 Document Number: 171503
The idea of this paper is to examine, after a discussion of the theoretical foundations, to what extent impedance plethysmography enables us to measure changes in the volume of the human extremities caused by capillary fluid filtration. Possibilities of error shown up in this paper - e. g., resistance of the skin, phase shift between current and voltage, the influence of specific resistance, dependence on temperature - partially confine the applicability of impedance plethysmography to comparative relative measurements. In these cases and in full view of the possibilities of error this method offers the advantage of absolutely pressureless measurement and the opportunity to extend this procedure to days.