Favorit i repris: Vilken SPF är du?

spf-skintone

Riktigt mörkhyade tål bara dubblet så mycket UVA som ljushyade

Skillnaden mellan den ljusaste och mörkaste hudfärg består bara av en ytterst liten mängd melanin (pigment). När huden utsätts för UV-ljus producerar melanocyterna mer melanin, men tyvärr är det inte något särskilt effektivt solskydd. Enligt vissa undersökningar så motsvarar en djup solbränna bara en SPF på 2. Med andra ord, efter en hel semesters solande tål man bara att vara dubbelt så länge i solen som när man precis kom ut ur vinterdvalan.

Ingen är immun mot solen

Det gula och röda melaninet hos ljushyade utgör ett sämre solskydd än det bruna melanin som finns hos dom med mörk hud. Men skillnaden är ändå mindre än vad man kan tro. Riktigt mörkhyade personer har ett naturligt SPF som motsvarar ungefär 13 och kan filtrera bort dubbelt så mycket UVA-strålar som ljushyade. Så ingen är immun mot solens skadliga strålar. Faktum är att personer med mörk hy löper större risk att dö av hudcancer än ljushyade. Detta eftersom ljushyade ofta är bättre på att skydda sig mot solen och också mer uppmärksamma på hudförändringar. Många mörkhyade tror däremot att de tål mer sol än vad de gör och slarvar oftare med att skydda sig och att titta efter tidiga cancertecken. Så även om mörkhyade mer sällan drabbas av hudcancer så har den oftare en dödlig utgång, eftersom den då har upptäckts i ett senare skede. 


A dark-skinned can only stand twice as much UVA-radiation than a fair-skinned

What is your natural SPF-factor? Some people may think that they are immune to the sun, but a really dark-skinned person can only stand twice as much UVA-radiation than someone with the fairest skin. At the most the darke-skinned can have a natural SPF-factor of 13. And a whole summer of tanning can only double your natural SPF-factor. It is a well kown fact that dark skinned persons have a higher risk of dying from skin cancer, since they are more neglective towards the hazards of getting to much UV-radiation.

Solskolan - mer läsning om solen!

Källa:
The burning facts. United States Environmental Protection Agency website. Published September 2006. Accessed August 16, 2006.
Dark skin does not block cancer. BBC News. Published July 2006. Accessed August 16, 2006.
Facts about sunscreens. (2006). American Academy of Dermatology website. Accessed August 16, 2006.
Hall HI, Rogers JD. Sun protection behaviors among African Americans. Ethn Dis. 1999;9:126-131.
Harper A. Skin cancer rare–but more deadly–in people with darker skin. University of Cincinnati website. Accessed August 16, 2006.
How to be safe when you’re in the sun. The Nemours Foundation website. Updated August 2007. Accessed November 17, 2008.
Paula Begoun, ”The original beauty bilble”, tredje upplagan, sid 87-99

 

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