An image-based mapping of significance and relevance of facial skin colour changes of females living in Thailand / P. Seroul in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 1 (02/2020)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 1 (02/2020) . - p. 99-107 Titre : An image-based mapping of significance and relevance of facial skin colour changes of females living in Thailand Type de document : texte imprimé Auteurs : P. Seroul, Auteur ; Remo Campiche, Auteur ; Sarah Gougeon, Auteur ; Marie Cherel, Auteur ; Anthony Vincent Rawlings, Auteur ; Rainer Voegeli, Auteur Année de publication : 2020 Article en page(s) : p. 99-107 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Cartographie  faciale'  Pertinence  'Couleur  de  peau'  Statistiques  Thailandaise Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : There are methods to evaluate skin colour on defined areas over the face but no approach automatically and accurately evaluates skin colour variations on large facial areas, comparing subjects, treatments and/or time points. We propose such an image-based approach to visualize quickly the outcome of clinical studies on colour variations. - Methods : Among 54 Asian women, one group applied a vehicle twice daily, during 28 days, and the other group an anti-ageing emulsion, taking facial images at baseline and after treatment. Changes in L*a*b* values were studied on four pre-selected facial regions. We also reconstructed average facial images from which the L*a*b* parameters were extracted for every pixel, computing relevance (ΔE) and significance data. Using colour gradients, we mapped these results onto the average facial images. - Results : After treatment, L*a*b* parameters show no statistically relevant colour changes in the vehicle group. In the ‘active’ group, skin was lighter at the upper cheek and, overall, redness decreased. Relevance and significance maps confirmed no visible colour changes in the vehicle group. In the ‘active’ group, the mapping approach revealed colour changes and their location. Skin became lighter below the eye, cheek and forehead. It was less red below the eyes, on the cheek, jawline and forehead, and generally more yellow. - Conclusion : Our image-based mapping approach proves to be powerful. It enables us to identify precise facial regions of relevant and statistically significant colour changes after a topical treatment, regions that would have otherwise been undetected. Note de contenu : - MATERIALS AND METHODS : Subjects and treatment - Acquisition of facial images and pre-processing - Classical determination of L*, a* and b* colour parameters - Image-based mapping of relevance and significance of changes in skin colour - RESULTS : Classical L*a*b* colour analysis only shows changes for subjects treated with the active formulation - Relevance maps indicate visible colour changes but gives little information on the nature of the changes - Significance maps give a detailed insight on colour changes over time DOI : 10.1111/ics.12593 En ligne : https://drive.google.com/file/d/1a-e0LZJdU_DTNY2U1EOZLJHjwKnjWrX8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33684 [article]

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Pigmentation effects of blue light irradiation on skin and how to protect against them / Remo Campiche in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 399-406 Titre : Pigmentation effects of blue light irradiation on skin and how to protect against them Type de document : document électronique Auteurs : Remo Campiche, Auteur ; S. J. Curpen, Auteur ; V. Lutchmanen-Kolanthan, Auteur ; Sarah Gougeon, Auteur ; Marie Cherel, Auteur ; G. Laurent, Auteur ; Mathias Gempeler, Auteur ; R. Schuetz, Auteur Année de publication : 2020 Article en page(s) : p. 399-406 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algues d'eau douce Biomolécules actives Formulation (Génie chimique) Lumière artificielle -- Effets physiologiques Lumière bleue Nicotinamide Pigmentation, Troubles de la Statistique Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Background : Visible light, in particular blue light, has been identified as an additional contributor to cutaneous photoageing. However, clinical studies demonstrating the clear effect of blue light on photoageing are still scarce, and so far, most studies have focused on broad-spectrum visible light. Although there is evidence for increased skin pigmentation, the underlying mechanisms of photoageing in vivo are still unclear. Furthermore, there is still a need for active ingredients to significantly protect against blue light-induced hyperpigmentation in vivo. Our study had two aims: to detect visible changes in skin pigmentation following repeated irradiation of the skin with LED-based blue light and to reduce pigmentation using suitable active ingredients. - Method : We conducted a randomized, double-blind and placebo-controlled clinical study on 33 female volunteers with skin phototypes III and IV. We used a repetitive blue light (4 × 60 J cm−2, 450 nm) irradiation protocol on the volunteers’ inner forearms. Using hyperspectral imaging, we assessed chromophore status. In addition, we took chromameter measurements and photographs to assess visible hyperpigmentation. - Results : We measured significant changes in chromophore status (P < 0.001 vs baseline), that is of melanin, haemoglobin and oxygen saturation, immediately after blue light irradiation. In addition, we found visible skin colour changes which were expressed by a significant decrease in ITA° values (delta ITA° = -16.89, P < 0.001 vs baseline for the placebo group) and an increase in a* (delta a* = +3.37, P < 0.001 vs baseline for the placebo group) 24 h post-irradiation. Hyperpigmentation and skin reddening were mitigated by both a formulation containing 3% of a microalgal product and a formulation containing 3% niacinamide. - Conclusion : Our study sets out an efficient and robust protocol for investigating both blue light-induced cutaneous alterations, such as changes in skin chromophores, and signs of photoageing, such as hyperpigmentation. Moreover, we have shown evidence that both an extract of the microalga Scenedesmus rubescens and niacinamide (vitamin B3) have the potential to protect against blue light-induced hyperpigmentation. Note de contenu : - MATERIALS AND METHODS : Test compounds - Blue light source - Clinical study design - Statistical analysis - RESULTS : Blue light‐induced changes in skin chromophores - Blue light‐induced changes in skin colour - Table 1 : Formulations used in this study DOI : https://doi.org/10.1111/ics.12637 En ligne : https://drive.google.com/file/d/1LwcZLPEyAn7hYOz0vljrQ_rPWJ1WpkLk/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35291 [article]

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Transferring pigmentation from forearm to face / Remo Campiche in GLOBAL PERSONAL CARE, Vol. 23, N° 3 (03/2022)  

[article]  inGLOBAL PERSONAL CARE > Vol. 23, N° 3 (03/2022) . - p. 60-64 Titre : Transferring pigmentation from forearm to face Type de document : texte imprimé Auteurs : Remo Campiche, Auteur ; Mathias Gempeler, Auteur ; Dominik Imfeld, Auteur ; Sarah Gougeon, Auteur ; Marie Cherel, Auteur ; Magalie Roche, Auteur Année de publication : 2022 Article en page(s) : p. 60-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dermo-cosmétologie Formulation (Génie chimique) Mesure Peau -- Soins et hygiène Pigmentation de la peau Simulation par ordinateur Visage -- Soins et hygiène Index. décimale : 668.5 Parfums et cosmétiques Résumé : There is interest, particularly within the cosmetics industry, in understanding what pigmentation reactions and their modulation look like on the face. We have therefore developed methods that enable us to transfer pigmentation digitally from volunteers’ inner forearms to their faces. Using these methods, we can predict facial pigmentation reactions, based on the reaction on surrogate body sites such as the forearm, without irradiating the face. En ligne : https://drive.google.com/file/d/16QUVBc4FHQ4XhXI_5UyzDQgvWkXvZTSv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37253 [article]

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