[Effect of single UVA and UVB irradiation on the surface composition and viscoelastic properties of skin in vivo].
The present study was designed to evaluate the effects of single irradiation either with UVA (dosage: 50 J/ cm2) or UVB (dosage: 1 MED) on surface structure and viscoelastic properties of human skin. Biophysical measurements by means of profilometry and cutometry were carried out on normally sunprotected skin areas directly before and 24 hours after irradiation. UVA induced neither measurable changes in skin surface structure (expressed by the profilometrically calculated parameters of roughness Ra and RzDIN and the parameter Wt reflecting depths of furrows) nor in its viscoelastic properties (expressed by the cutometrically calculated ratio Uv/Ue reflecting viscosity and the ratio Ur/Uf reflecting biological elasticity). However, a single erythemogenic dose of UVB radiation was followed by significant increase in the depths of furrows, increase in viscosity and decrease in biological elasticity.
Habig
J
J
Dermatologische Klinik und Poliklinik, Technischen Universität, München.
Vocks
E
E
Kautzky
F
F
Dahm
M
M
Borelli
S
S
D000293:Adolescent; D000328:Adult; D004307:Dose-Response Relationship, Radiation; D004548:Elasticity; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012867:Skin / Q000528:radiation effects*; D015595:Skin Aging / Q000528:radiation effects*; D014466:Ultraviolet Rays / Q000009:adverse effects*; D014783:Viscosity