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Is UVA radiation safe in the early morning and in the evening?

skin aging

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3 replies to this topic

#1 Maecenas

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Posted 15 October 2015 - 08:29 PM


Could someone explain me how does UVA damages skin - is it a linear process, when the amount of radiation is directly proportional to the amount of damage caused or is it more complicated than that. As far as I know the UVB indices up to 3 are considered safe, is it the same for the UVA? I'm totally confused about this question.


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#2 niner

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Posted 15 October 2015 - 10:21 PM

I think the initial damage is linear with the dose of UV.  However, some kinds of damage can be repaired, so if the dose stays under the level at which repairs can be made, you might not notice a problem at a low enough dose.  That doesn't take into account any damage that is not repairable, though, so I wouldn't count on repair phenomena to protect you.  Certainly there is a difference in damage from UVA and UVB, with UVA being a bigger problem because it penetrates deeper into the skin.   A useful mnemonic device is UV B=Burning, UV A=Aging.  UVA is responsible for much of the aging damage from the sun, while UVB is a bigger contributor to sunburn.   At least UVB creates vitamin D, while I don't know of any redeeming qualities for UVA.   Personally, I use a decent broad spectrum sunscreen every day, and supplement vitamin D.  I wouldn't lose any sleep over a little early morning or late day exposure to sun; my main goal is to minimize total UV dose without having sun avoidance take over my life.



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#3 Heyman

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Posted 17 October 2015 - 10:21 AM

This is a question I have been asking myself, it seems like there is no easy answer. There certainly are studies suggesting that relatively low doses of UVA might cause aging. On the other hand at least one researcher disagrees with the interpretation of these studies and claims higher doses are needed. If some people are interested I might check to find the studies again I am talking about or look for research in general. We'd need someone with more knowledge about interpreting these kinds of things and more research in general though.


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#4 DanielEdward

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Posted 15 February 2016 - 08:40 PM

"UVA exposure reduces human blood pressure by releasing nitric oxide metabolites from storage in the skin"

http://mobile.the-sc...-blood-pressure
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