1. UVA1-Induced Skin Darkening Is Associated with Molecular Changes Even in Highly Pigmented Skin Individuals 
Claire Marionnet, Stéphanie Nouveau, Virginie Hourblin, Kumar Pillai, Megan Manco, Philippe Bastien, Christian Tran, Caroline Tricaud, Olivier de Lacharrière, Françoise Bernerd 
Journal of Investigative Dermatology 
Volume 137, Issue 5, Pages (May 2017)
DOI: /j.jid
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2. Figure 1
Constitutive skin color and UVA1-induced pigmentation. (a–c) Constitutive skin color volumes in L*b* plane for the 24 European, the 16 Indian, and the 22 African volunteers (gray points). The blue line delimitates the projection of skin color volume in L∧b plane. ITA values were calculated using the colorimetric parameters L* and b* according to the formula ITA = [ArcTangent((L* − 50)/b*)]180/π. The red dotted lines categorizes skin color groups from “Very Light” to “Dark,” according to the ITA value. (d–f) Visual clinical grading of pigmentation comparing the UVA1-exposed site with the nonexposed site, using a 6-point scale grading (Supplementary Materials and Methods). (g–i) Luminance measurements. (j–l) b* measurements. (d–l) Values are expressed as means ± CI95%. *Mean value of the exposed site significantly different from the mean value of the nonexposed site (P < 0.05). CI95%, confidence intervals for mean (95%); D, days; ITA, individual typology angle; UVA1, 340–400 nm waveband.
Journal of Investigative Dermatology  , DOI: ( /j.jid )
Copyright © 2017 The Authors Terms and Conditions