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The relationship between age-related changes in the physical properties and development of wrinkles in human facial skin

1995; Society of Cosmetic Chemists; Volume: 46; Issue: 3 Linguagem: Inglês

2689-5161

Yoshinori Takema, Yukiko Yorimoto, Michio Kawai,

Dyeing and Modifying Textile Fibers

We previously measured age-related changes in the elasticity of human skin and reported parameters of actinic and intrinsic aging [Y. Takema et al., By. J. Dermatol., 131, 641-648 (1994)]. In this study, scoring of wrinkles was performed using photographs simultaneously with measurement of these parameters, and an association between these parameters and wrinkle formation was found. The wrinkle formation rate (slope of wrinkle scores vs chronological age) decreased in the following order : eye corner > forehead > cheek > mouth corner. Calculated on a logarithmic basis, the relationship between the mean relative elasticity parameter Ur/Uf and the wrinkle formation rate was observed, but there was no such relationship with the absolute parameter Ue * . This finding suggested that the different susceptibilities of various facial regions to wrinkling was dependent on the parameter Ur/Uf. It is generally accepted that wrinkle formation is more marked in the face frequently exposed to the sun. However, in this study no relationship was confirmed between wrinkle formation rate and Ue * , a parameter reflecting the influence of exposure to the sun. Rather, a marked correlation was observed with Ur/Uf, a parameter reflecting intrinsic aging. These results suggest that another important UV-related factor is involved in addition to changes in physical properties in the progression of wrinkles.