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Related Experiment Videos

What are meters measuring?

P J Dykes1

  • 1Cutest Systems Ltd, 174 Whitchurch Road, Heath, Cardiff, UK.

International Journal of Cosmetic Science
|May 24, 2008
PubMed
Summary
This summary is machine-generated.

Manufacturers must link objective skin measurements to consumer perception for effective cosmetic claims. Understanding what devices measure, like transepidermal water loss (TEWL) versus skin hydration, is crucial for product development and marketing.

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Area of Science:

  • Cosmetic science
  • Dermatology
  • Biophysical measurements

Background:

  • Increasing demand for data to substantiate cosmetic product claims.
  • Human studies are the most reliable source of data for cosmetic claims.
  • Various biophysical measurement devices exist, but their interpretation requires expertise.

Purpose of the Study:

  • Clarify the distinction between transepidermal water loss (TEWL) and stratum corneum hydration measurements.
  • Highlight the importance of understanding what skin physiology meters actually measure.
  • Emphasize the need to correlate objective measurements with consumer-perceived product benefits.

Main Methods:

  • Review of biophysical measurement principles, including TEWL and electrical properties (capacitance/conductance) for hydration.

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  • Discussion of potential disconnect between device-generated data and consumer perception.
  • Reference to a study comparing perceptual tests with standard volunteer tests for moisturization claims.

    • Main Results:

    • Transepidermal water loss (TEWL) measures skin barrier function, not hydration.
    • Electrical property measurements (capacitance/conductance) can indicate stratum corneum hydration.
    • Objective increases in water content (e.g., 20%) may not translate to proportional consumer-perceived moisturization.

    Conclusions:

    • Accurate interpretation of biophysical measurements is essential for meaningful cosmetic claims.
    • A gap exists between technically measurable parameters and consumer-relevant benefits.
    • Integrating objective testing with perceptual assessments during product development is key for systematic advancement.