Skin impedance from 1 Hz to 1 MHz
Rosell, J.; Colominas, J.; Riu, P.; Pallas-Areny, R.; Webster, J.G.
Biomedical Engineering, IEEE Transactions on
Volume 35, Issue 8, Aug 1988 Page(s):649 - 651
Digital Object Identifier   10.1109/10.4599
Summary:The impedance of skin coated with gel but otherwise unprepared was measured 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 the bipotential amplifier input impedance should be very high to avoid common-mode-to-differential-mode voltage conversion. The 1-MHz impedance was tightly clustered about 120 Ω. The 100-kHz impedance was about 220 Ω, which suggests that the variation in skin impedance can cause errors in two-electrode electrical impedance tomographs

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