Daytime Changes of Skin Biophysical Characteristics: A Study of Hydration,Transepidermal Water Loss,pH, Sebum,Elasticity, Erythema,and Color Index on Middle Eastern Skin |
| |
| Authors: | Alireza Firooz Hamed Zartab Bardia Sadr Leili Naraghi Bagherpour Aidin Masoudi Ferial Fanian Yahya Dowlati Amir Hooshang Ehsani Aniseh Samadi |
| |
| Affiliation: | From the Center for Research and Training in Skin Diseases and Leprosy, Tehran University of Medical Sciences, Tehran, Iran;1Department of Dermatology, Tehran University of Medical Sciences, Tehran, Iran |
| |
| Abstract: | Background:The exposure of skin to ultraviolet radiation and temperature differs significantly during the day. It is reasonable that biophysical parameters of human skin have periodic daily fluctuation. The objective of this study was to study the fluctuations of various biophysical characteristics of Middle Eastern skin in standardized experimental conditions.Results:A significant difference was observed between means of skin color index at 8 a.m. (175.42 ± 13.92) and 4 p.m. (164.44 ± 13.72, P = 0.025), between the pH at 8 a.m. (5.72 ± 0.48) and 4 p.m. (5.33 ± 0.55, P = 0.001) and pH at 12 p.m. (5.60 ± 0.48) and 4 p.m. (5.33 ± 0.55, P = 0.001). Other comparisons between the means of these parameters at different time points resulted in nonsignificant P values.Conclusion:There are daytime changes in skin color index and pH. Skin color index might be higher and cutaneous pH more basic in the early morning compared to later of the day. |
| |
| Keywords: | Color pH skin barrier skin structure statistics transepidermal water loss |
|
|
