Ultraviolet rays are harmful to our skin (the wavelength is the most dangerous of the 290 to 320 nm).Only people with a very dark or black skin in the body is allocated a sufficient amount of melanin in order to fully protect yourself from the harmful effects of these luchey.Vred, which may be caused to your skin, is directly proportional to the time spent in the sun.In small doses (up to ten minutes), the sun is only slightly irritating to the skin, causing a slight reddening.In high doses, it becomes inflamed, swells.Continuing exposure can burn skin, while it is covered with blisters and peels.
Excessive exposure to the sun causes skin damage such that it is no longer able to perform their normal functions.In severe burns stops thermoregulation, which in turn leads to sunstroke.This is very serious, because at very high temperature in the body stops normal metabolism.There are cases where people have died from sunstroke.
danger of exposure to the sun is still in the fact that under the influence of
experiment of American dermatologists convincingly proved that the sun's rays age the skin.four small skin samples were taken: one from the back and forearms octogenarian and similar pieces of leather boys.Collagen in the skin of old person back matched (taking into account the natural aging process) collagen in both young human skin samples.However, the collagen in the skin of the forearm old man was destroyed to a much greater extent.The only explanation for this difference may be that the forearm was exposed to sunlight for 80 years, while the back was covered with clothes, this experiment is worth remembering when you are ready to undress on the beach and sunbathe.
The biggest reason why you should avoid tanning is that the sun's rays cause drastic changes in the skin, which may contribute to the formation of skin cancer.Of course, in order to have occurred such changes, you need a very long time to be in direct sunlight, so the white-skinned people living in countries such as Australia, where the number of sunny days per year is large, is much more likely to get skin cancer than people,living, say, in the UK, where sunny days are relatively rare.People
produce melanin with black skin effectively so that they are not subjected to such an extent as whites, danger cancer, regardless of how long they are in the sun.
duration of your stay in the sun should also depend on the condition of the skin.People with vitiligo (skin, where there is no pigmentation) or chloasma (areas of skin with excess pigmentation) should avoid sunlight.In the first case, the skin is burned quickly in the second - spots darken and become more noticeable.When dermatitis is also not necessary to stay in the sun
already dehydrated skin further dried, which impairs its so¬stoyanie.
Sunbathing, however, can help those who suffer from acne, one of the ways to clear the mouth of the sebaceous gland - cause mild skin peeling.This method is the basis of the treatment with ultraviolet rays.Exposure to natural sunlight gives the same effect.When peeling with dead cells from the skin cells go, bridging the mouth of the sebaceous gland, and its functions are restored,
Psoriasis - another skin disease in which can be useful sunbathing.The cause of the unpleasant condition is overproduction of new cells in the basal layer of the skin, which reach the outer horny layer to form flakes.If the damaged surface affect a small number of natural or artificial UV rays, these flakes go when peeling.
Summer is in full swing, and now especially drawn to the waters, the beaches, to swim and sunbathe.Be careful!Sunbathing carefully and long.Only then it will do you good and not harm your health and beauty.