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Modelling the effect of hydration on skin conductivity.

L Davies1,2, P Chappell2, T Melvin2,3

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Skin Research and Technology : Official Journal of International Society for Bioengineering and the Skin (ISBS) [And] International Society for Digital Imaging of Skin (ISDIS) [And] International Society for Skin Imaging (ISSI)
|November 23, 2016
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This study models skin impedance and conductivity relationships. Increased skin hydration (conductivity) above 40 kHz decreases electrical impedance, with specific mathematical models for different conductivity ranges.

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bioimpedancemodellingskin conductanceskin potential

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Materials Science

Background:

  • Electrical signals are crucial for medical devices interacting with the body through the skin.
  • Skin hydration significantly impacts electrical conductivity, affecting signal transmission.
  • Understanding skin impedance is vital for accurate bioelectrical measurements and stimulation.

Purpose of the Study:

  • To develop a model that elucidates the relationship between skin impedance and conductivity.
  • To quantify how varying hydration levels influence skin's electrical properties.
  • To establish predictive models for skin impedance based on conductivity.

Main Methods:

  • A computational model simulating skin's electrical properties was employed.
  • The model incorporated varying conductivity values in the stratum corneum to represent different hydration levels.
  • The model was subjected to a range of electrical signal frequencies.

Main Results:

  • Skin impedance and conductivity remained stable below 40 kHz.
  • Above 40 kHz, increased conductivity led to a significant decrease in overall skin impedance.
  • The study identified distinct frequency-dependent behaviors.

Conclusions:

  • Skin impedance can be modeled quadratically for conductivity between 5 and 50 mSm⁻¹.
  • A double exponential decay model accurately represents impedance variation for conductivity between 5 and 5000 mSm⁻¹.
  • These models provide a quantitative framework for understanding skin hydration effects on electrical impedance.