Unbearable transepidermal water loss (TEWL) experimental variability: why?

Area of Science:

• Dermatology
• Biophysics
• Skin Physiology

Background:

• Transepidermal water loss (TEWL) is a key indicator of skin barrier function.
• Existing TEWL research exhibits significant data variability.
• Uncontrolled experimental variables are suspected causes of this disparity.

Purpose of the Study:

• To identify experimental variables that significantly impact TEWL measurements.
• To determine if these variables contribute to the observed disparity in TEWL research data.
• To provide recommendations for improving the consistency and reliability of TEWL studies.

Main Methods:

• Conducted a comprehensive literature search to identify potential confounding variables in TEWL studies.
• Performed a subsequent literature search to find studies investigating the impact of identified variables on TEWL.
• Analyzed the influence of various factors on TEWL metrics.

Main Results:

• Age, anatomical site, and ambient temperature were identified as significant factors impacting TEWL.
• Variables such as smoking and menstrual cycle showed inconclusive results or insufficient data for definitive conclusions.
• The impact of certain variables on TEWL metrics requires further investigation.

Conclusions:

• Controlling for key experimental variables like age, anatomical site, and temperature is essential for reducing TEWL data disparity.
• Further research is needed to clarify the impact of smoking and menstrual cycle on TEWL.
• Standardizing experimental conditions can enhance the reliability and comparability of TEWL research findings.