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. 2017 Aug;23(3):363-368.
doi: 10.1111/srt.12344. Epub 2016 Nov 22.

Modelling the effect of hydration on skin conductivity

L Davies  1   2 , P Chappell  2 , T Melvin  2   3
Affiliations

Modelling the effect of hydration on skin conductivity

L Davies et al. Skin Res Technol. 2017 Aug.

Abstract

Background: Electrical signals are recorded from and sent into the body via the skin in a number of applications. In practice, skin is often hydrated with liquids having different conductivities so a model was produced in order to determine the relationship between skin impedance and conductivity.

Methods: A model representing the skin was subjected to a variety of electrical signals. The parts of the model representing the stratum corneum were given different conductivities to represent different levels of hydration.

Results: The overall impedance and conductivity of the cells did not vary at frequencies below 40 kHz. Above 40 kHz, levels of increased conductivity caused the overall impedance to decrease.

Conclusion: The variation in impedance with conductivity between 5 and 50 mSm-1 can be modelled quadratically while variation in impedance with conductivity between 5 and 5000 mSm-1 can be modelled with a double exponential decay.

Keywords: bioimpedance; modelling; skin conductance; skin potential.

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