Transepidermal water loss during sleep in infants

Area of Science:

• Neonatal physiology
• Sleep science
• Dermatology

Background:

• Transepidermal water evaporation (TEWE) is a key indicator of skin barrier function.
• Understanding TEWE variations in infants is crucial for assessing skin health and development.
• Sleep state influences various physiological parameters in infants.

Purpose of the Study:

• To investigate the impact of sleep-wake states on transepidermal water evaporation (ER) in infants.
• To determine if sleep state affects ER measurements in a healthy infant population.

Main Methods:

• Transepidermal water evaporation rate (ER) was measured in 207 infants using an Evaporimeter.
• Measurements were taken from the forehead during polygraphic sleep recordings.
• ER values were analyzed in relation to different sleep states: quiet wakefulness, non-REM (NREM) sleep, and rapid eye movement (REM) sleep.

Main Results:

• ER was significantly lower during REM sleep (8.5 g/m2 X h) compared to quiet wakefulness (11.6 g/m2 X h) and NREM sleep (11.2 g/m2 X h).
• These differences in ER were not influenced by infant age, sex, weight, or rectal temperature, as confirmed by covariance analysis.
• The findings highlight state-dependent variations in water loss through the skin in infants.

Conclusions:

• Infant transepidermal water evaporation rate is significantly influenced by the state of sleep or wakefulness.
• Researchers should account for sleep-wake state when interpreting TEWE data in infants.
• These findings contribute to a better understanding of infant skin physiology and its regulation during sleep.