{"id":19696,"date":"2023-08-27T21:26:55","date_gmt":"2023-08-27T21:26:55","guid":{"rendered":"https:\/\/www.africa-press.net\/benin\/politique\/creme-solaire-a-chaque-peau-son-indice"},"modified":"2023-08-27T21:35:48","modified_gmt":"2023-08-27T21:35:48","slug":"creme-solaire-a-chaque-peau-son-indice","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/benin\/toutes-les-actualites\/creme-solaire-a-chaque-peau-son-indice","title":{"rendered":"Cr\u00e8me solaire\u00a0: \u00e0 chaque peau son indice"},"content":{"rendered":"

Africa-Press – Benin. <\/strong><\/span>Cet article est issu du magazine Les Indispensables de Sciences et Avenir n\u00b0214 date\u0301 juillet\/ septembre 2023.<\/p>\n

Pour bien choisir sa cre\u0300me, il faut d’abord de\u0301terminer son phototype, c’est-a\u0300-dire sa capacite\u0301 a\u0300 bronzer – ou a\u0300 bru\u0302ler – en s’observant lors des premie\u0300res expositions, d’apre\u0300s un classement qui comprend 7 degre\u0301s – de 0 (peau albinos) a\u0300 6 (peau noire). Quatre e\u0301le\u0301ments sont pris en compte : couleur des cheveux, teinte de la peau, fre\u0301quence des coups de Soleil, type de bronzage.<\/p>\n

Un indice 50 ne laisse – normalement – passer que 2 % des UV-B<\/b><\/p>\n

Pour se\u0301lectionner la cre\u0300me ade\u0301quate, le principe consiste a\u0300 combiner son phototype avec le facteur de protection solaire SPF (FPS en franc\u0327ais) annonce\u0301 sur l’emballage. Les SPF sont classe\u0301s en huit indices correspondant a\u0300 quatre niveaux de protection : faible (indices 6 et 10) ; moyenne (15, 20 et 25) ; haute (30 et 50) ; tre\u0300s haute (50+). Les personnes a\u0300 peau tre\u0300s claire ou tre\u0300s fragile, comme les be\u0301be\u0301s, doivent choisir le niveau maximal (50+). Les peaux mates doivent quand me\u0302me e\u0302tre prote\u0301ge\u0301es la\u0300 ou\u0300 le rayonnement UV-B est accru : haute montagne, re\u0301gions proches de l’e\u0301quateur.<\/p>\n

Le SPF refle\u0300te la quantite\u0301 d’UV-B transmis a\u0300 la peau selon la formule 1\/indice. Ainsi, un indice 50 ne laisse passer que 2 % (1\/50) des UV-B, un indice 30, 3,33 %. Mais quid des UV-A ? Depuis 2006, la re\u0301glementation europe\u0301enne impose que les produits prote\u0300gent aussi contre eux a\u0300 raison d’au moins un tiers de leur indice. Par exemple, un SPF30 doit garantir un indice 10 pour les UV-A et un SPF50, un indice 16,6.<\/p>\n

L’e\u0301quivalent de six cuille\u0300res a\u0300 cafe\u0301 pour le corps<\/b><\/p>\n

Au-dela\u0300 de l’indice, le volume applique\u0301 est essentiel. Le SPF est en effet calcule\u0301 a\u0300 partir d’une quantite\u0301 pre\u0301cise, 2 mg\/cm2, ce qui repre\u0301sente une couche tre\u0300s e\u0301paisse de produit. Personne ne la respecte dans la vie courante. On tournerait pluto\u0302t autour de 1 a\u0300 0,5 mg\/cm2 , selon les spe\u0301cialistes. Or, si l’on applique 1 mg\/cm2 d’une cre\u0300me a\u0300 indice 50, elle laisse passer 14 % des UV-B au lieu des 2 % pre\u0301vus.<\/p>\n

Pour respecter les doses, il faudrait mettre l’e\u0301quivalent de six cuille\u0300res a\u0300 cafe\u0301 pour le corps et une pour le visage. \u00ab\u00a0Il faut aussi absolument renouveler l’application toutes les deux heures a\u0300 l’exte\u0301rieur, car les filtres perdent leur efficacite\u0301 avec la transpiration ou les bains. Mettre de la cre\u0300me seulement en arrivant a\u0300 la plage ne sert a\u0300 rien\u00a0\u00bb, insiste Marie-Aleth Richard, qui ajoute : \u00ab\u00a0Inutile e\u0301galement de garder un tube ouvert d’une anne\u0301e sur l’autre car les produits se de\u0301gradent au contact de l’air.\u00a0\u00bb<\/p>\n

Par Marie-Laure The\u0301odule<\/p>\n

Pour plus d’informations et d’analyses sur la Benin<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Benin. Cet article est issu du magazine Les Indispensables de Sciences et Avenir n\u00b0214 date\u0301 juillet\/ septembre 2023. Pour bien choisir sa cre\u0300me, il faut d’abord de\u0301terminer son phototype, c’est-a\u0300-dire sa capacite\u0301 a\u0300 bronzer – ou a\u0300 bru\u0302ler – en s’observant lors des premie\u0300res expositions, d’apre\u0300s un classement qui comprend 7 degre\u0301s – […]<\/p>\n","protected":false},"author":82,"featured_media":19695,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,50,45],"class_list":["post-19696","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-benin","tag-benin"],"yoast_head":"\nCr\u00e8me solaire\u00a0: \u00e0 chaque peau son indice - B\u00e9nin<\/title>\n<meta name=\"description\" content=\"Cet article est issu du magazine Les Indispensables de Sciences et Avenir n\u00b0214 date\u0301 juillet\/ septembre 2023. 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