We measured the impedance of skin coated with gel, but otherwise unprepared from 1 Hz to 1 MHz at ten sites on the thorax, leg, and forehead of ten subjects. For a 1 cm2 area, the 1 Hz impedance varied from 10 kΩ to 1 MΩ, which suggests that biopotential amplifier
input impedance should be very high to avoid common mode to differential mode voltage conversion. 1 MHz impedance was tightly clustered about 120 Ω. 100 kHz impedance was about 220 Ω,which suggests that the variation in skin impedance may cause errors in two electrode electrical impedance tomographs.
CitationRosell, J; Colominas, J; Riu, P; Pallas, R; Webster, JG. Skin impedance from 1 Hz to 1 MHz. IEEE Transactions on Biomedical Engineering, 1988, vol.35, núm.8 p. 649-651
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder. If you wish to make any use of the work not provided for in the law, please contact: firstname.lastname@example.org