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Effect of chronic sleep deprivation on skin status in healthy young women

The majority of the studies conducted on sleep deprivation has been dedicated to the consequences on the psychomotor performances. However, the impact of a debt of sleep on the skin has never been studied to date. Fourteen Caucasian females subjects (3040 years) were included in this study that consisted in 3 sessions: baseline session (2 days), chronic partial sleep deprivation session (6 days, 4 hours of sleep allowed) and sleeprecovery session (4 days). Polysomnography recordings, assessments of mood and psychomotor vigilance, and measurements of biophysical skin properties have been collected from these women. The variations of these data during the study have been first described using descriptive analysis methods and graphs. Then, Multiple Factor Analyses (MFA) and Partial Least Square (PLS) approaches were used to highlight possible correlations and causal links. A significant reduction of capacitance (reflect of skin hydration) and an increase of skin pH were found between the baseline and the end of deprivation sessions. MFA showed that during the deprivation session, SWS (Slow Wave Sleep) was correlated to these two biophysical skin properties. Furthermore, PLS approach demonstrated that the shorter the time passed in NREM sleep (Non Rapid Eye Movement), the lower the capacitance and the higher the skin pH. Partial sleep deprivation provoked slight modifications of biophysical skin properties, which returned to their baseline values during the sleep-recovery session.