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Area of Science:

  • Environmental physiology
  • Dermal biophysics
  • Textile science

Background:

  • Skin physiological parameters exhibit variability with environmental conditions.
  • Discrepancies in existing literature highlight challenges in comparing studies due to differing conditions.
  • Reliable environmental control is crucial for accurate assessment of skin properties.

Purpose of the Study:

  • To clarify the relationship between skin properties (TEWL, hydration, Tsk) and environmental factors (Ta, RH).
  • To establish a foundation for textile engineering and comfortable clothing design.
  • To develop empirical models for predicting skin parameter changes.

Main Methods:

  • Controlled experiments in a climatic chamber with varied ambient temperature (Ta) and relative humidity (RH).
  • Assessment of skin hydration (capacitance method), transepidermal water loss (TEWL, Tewameter), and mean skin temperature (Tsk, thermistors).
  • Testing on a panel of six young female subjects across multiple environmental conditions.

Main Results:

  • Transepidermal water loss (TEWL) significantly correlated with ambient temperature (Ta); RH had a lesser effect.
  • Mean skin temperature (Tsk) showed a stronger correlation with Ta than with RH.
  • Skin surface hydration was significantly influenced by both Ta and RH.

Conclusions:

  • Empirical models were developed to predict changes in TEWL, skin hydration, and Tsk under varying climatic conditions.
  • The derived relationships are specific to the tested range of Ta (20-30°C) and RH (25-85%).
  • Findings are applicable to young female subjects aged 25-35 years for textile design considerations.