We are constantly exposed to ultraviolet (UV) rays to varying degrees. The sun, we love it but this accomplice can become an enemy. Before buying your sunscreen, discover the functioning of UV and IR to protect you at best.
Sun, instructions for use
The solar spectrum consists of electromagnetic rays of energy and variable wavelengths. They penetrate more or less deeply into the skin and induce biological effects that are beneficial but can also be harmful. Among them, ultraviolet.
What is UV and IR?
Ultraviolet radiation is electromagnetic radiation with an intermediate wavelength between that of visible light and that of X-rays.
Infrared (IR) radiation is electromagnetic radiation with a wavelength longer than that of visible light.
There are several types of ultraviolet: UVA (400-315 nm), UVB (315-280 nm) and UVC (280-10 nm).
– UVCs are the most harmful, shorter, but they do not reach the surface of the earth because they are completely filtered by the atmosphere, stopped by the ozone layer. This is why the hole in the ozone layer is potentially dangerous.
– UVB, of average wavelength, do not penetrate beyond the superficial layers of the skin, they are absorbed by the stratum corneum.
– UVAs, which have a relatively long wavelength, account for nearly 95% of the UV radiation reaching the surface of the earth. They can penetrate deep layers of skin.
Ultraviolet: what a
re its characteristics?
The sensation of heat due to the sun comes from the infrared. An ultraviolet ray , for its part, crosses the atmosphere even in cold or cloudy weather. It should be noted that in May for example the level of ultraviolet rays is comparable to those of August. Since our skin is not prepared after the winter, it is all the more sensitive.
You should also know that they are more numerous between 12h and 16h. It is good to know that UV is reflected by water (5% of reflected UV), sand (20% of reflected UV), grass (5% of reflected UV) and snow (85% Of reflected UV). This is why we must pay particular attention to the reverberation and to protect ourselves from these rays that we do not necessarily feel warm on our skin.
What is the action of UV on the skin?
UVBs act on the epidermis: they stimulate melanin, from brown to red pigments, which color the skin and protect it from the sun’s rays. These same ultraviolet causes in 48 hours the appearance of durable tanning .
The UVA penetrate deeper into the dermis. These are the major causes of skin aging . They attack the fibers of elastin and collagen, proteins of the skin, of which any lesion is irreversible. An area burned by the sun will remain sensitive all life and will have to be super protected.
IR (infrared) penetrate deep into the skin. They do little tan and create a phenomenon of vasodilation which can lead to small circulatory problems.
The different types of ultraviolet
– UVB, the + : indispensable to the synthesis of vitamin D which fixes the calcium of the bones and which plays a fundamental role on the structure of the epidermis, they tan.
– The – : responsible for the sunburn, they can lead to cell mutations.
– UVA, + : give an immediate but temporary tan.
– The : – generate free radicals which cause cell and support fiber defects, causing photoaging. This causes the appearance of wrinkles and brown spots, and even the development of certain dermatoses (skin disease), from the most benign to the most severe (melanoma: skin cancer).
– IR, the + : bring the feeling of warmth very pleasant.
– The- dehydrate and may cause skin dryness.
What solutions should be adopted to protect themselves?
The ultra-violet is invisible. Aside from the feeling of warmth on your skin, you will not be able to appreciate the effect of these when you are under a cloudy sky, in the mountains, when there is wind and so on. We must therefore anticipate and think about protecting ourselves.
The solution? Adopt a sunscreen adapted to the skin tone to keep it healthy. But not only that! Ultra-violet has not only an impact on your skin but also on your eyes. Beyond a sunscreen , think of wearing sunglasses , a hat, a cap or something else.
Too often exposed to the sun and therefore to the ultraviolet, the hair is also damaged because it’s aggressed at the level of keratin. Hair protection essential either with a hat or with a suitable hair care .
And making UV in the cabin, is it dangerous?
Using artificial ultraviolet radiation is strongly discouraged by the entire medical community, which sees it as a danger to the skin. Contrary to what one would think, they do not prepare your skin for exposure to the sun because they do not thicken our skin. They also have no impact on our brain and wellness as would exposure to the sun.