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. 2010 Dec;9(4):297-301.
doi: 10.1111/j.1473-2165.2010.00525.x.

Effects of sunscreen on human skin's ultraviolet radiation tolerance

Chao Yuan  1 , Xue-min Wang, Yi-mei Tan, Li-jie Yang, Yin-fen Lin, Pei-lan Wu
Affiliations

Effects of sunscreen on human skin's ultraviolet radiation tolerance

Chao Yuan et al. J Cosmet Dermatol. 2010 Dec.

Abstract

Purpose: To observe the alteration ultraviolet radiation (UVR) of skin's tolerance after its exposure to the small dose of UVR under the protection of sunscreen.

Methods: Eleven subjects who applied sunscreen were exposed to 0.75 dose minimal persistent pigment darkening (MPPD) and minimal erythema dose (MED) by the Phototherapy Unit for 4 weeks. Each week their MPPDs and MEDs were measured by solar simulator. Meanwhile, SPECTCOLOMETER® and VISIOSCAN VC98® were used to detect the test areas and control areas.

Results: The values of MPPD and MED increased significantly after the exposure to UVR. But there were no visible changes on the surface of skin's texture.

Conclusion: With the protection of sunscreen, the UVR tolerance of skin was greatly increased after the skin's exposure to the small dose UV.

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