http___metro-portal.hr_sest-mitova-o-suncanju_73026_1.xml
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The sun sustains life on earth but over exposure to the sun rays speeds up the aging process. The free radicals produced by the UV rays damages the DNA in skin cells, impair collagen production, destroy elastin and ruin skin’s ability to regenerate and repair. With time, unappealing changes such as dark spots, dryness and wrinkles appear on the skin . The collective harm done by the sun is known as photo damage. The ability to endure the sun entirely depends on the skin type and the degree of exposure to sunlight. Dark skins, with more melanin, are more sun tolerant than fair skins; as a result, they tend to age slower. UV radiation, a known carcinogen, can have a number of harmful effects on the skin. The two types of UV radiation that can affect the skin are as follows; UVA and UVB. Both are linked to skin cancer and can lead to weakened immune system. They also contribute to premature aging of the skin and cataracts (a condition that impairs eyesight), and cause skin color changes. UVA rays, which are not absorbed by the ozone layer, penetrate deep into the skin and heavily contribute to premature aging. Up to 90 percent of changes in skin are attributed to the aging process caused by sun exposure. UVB Rays, powerful rays which are partially absorbed by the ozone layer, mostly affect the surface of the skin and are the primary cause of sunburn. Because, of the thinning of the ozone layer, the effects of UVB radiation will pose an increased threat till the layer. Sunscreen protects the skin by absorbing and/or reflecting UVA and UVB rays. The FDA requires that all sunscreens contain a Sun Protection Factor (SPF) label. The SPF reveals the relative amount of sun protection that a sunscreen can provide to an person when correctly applied at regular intervals. Sunscreens with an SPF of at least 15 are recommended. You should be aware that an SPF of 30 is not twice as protective as an SPF of 15; rather, when properly used, an SPF of 15 protects the skin from 93 percent of UVB radiation, and an SPF 30 sunscreen provides 97 percent protection only. Although the SPF ratings found on sunscreen packages apply mainly to UVB rays, many sunscreen manufacturers include ingredients that protect the skin from some UVA rays as well. These “broad-spectrum” sunscreens are highly recommended now days. Broad-spectrum sunscreens often contain a number of chemical ingredients that absorb UVA and UVB radiation. Many sunscreens contain UV A-absorbing avobenzone or a benzophenone (such as dioxybenzone, oxybenzone, or sulisobenzone), in addition to UVB-absorbing chemical ingredients (some of which) also contribute to UV A protection. Some sunscreens also contain alcohol, fragrances, or preservatives, and should be avoided if you have skin allergies. The physical compounds present in sunscreens are as follows; titanium dioxide and zinc oxide which reflect, scatter, and absorb both UVA and UVB rays. Thus, we should be aware of a good sunscreen which is an active part of wrinkle management. It is imperative to apply a sunscreen with Sun Protective Factor (SPF) of at least 15, twenty minutes before stepping out in the sun. Sunscreens must be re -applied after every 2 hours, after sweating or after swimming. For those living in humid climates, wearing sunscreen containing greater SPF may clog the skin pores leading to breakouts. Sunscreens or anti-wrinkle creams with SPF 15 are adequate for daily use. We should choose a broad-spectrum sunscreen, which blocks both types of UV rays, UVA and UVB, with an SPF of at least 30. Antioxidant-fortified formulas containing ingredients such as resveratrol, vitamin C, B- carotene or coffee can offer additional protection. At last, we can say that the active sunscreen ingredients present in the sunscreen will block out the complete spectrum of UVA and UVB rays. Thus, acts as a perfect solution to slow down the process of aging. We should remember to prevent sun tanning and sun burns by applying proper sunscreen lotions of appropriate SPF, stay in shade and wear proper clothing attire to prevent our skin from aging process.
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Šest mitova o sunčanju Mitovi o sunčanju ne samo da su pogrešni, nego su i prilično opasni po zdravlje, stoga pripazite i držite se savjeta Sunčanje postaje sve opasnija ljetna zabava, jer je rak kože postao najčešća vrsta raka u SAD, a glavni uzrok je UV zračenje sunca, solarija i lampi za sunčanje. Upravo iz tog razloga prenosimo vam razmišljanja dr. Sandre Fryhofer koja raskrinkava mitove o sunčanju. Zaštitit ćemo se sunčanjem prije godišnjeg odmora Nažalost, netočno. Povećat ćete pigmentaciju kože, istina, no to je kao da ste nanijeli faktor zaštite 3. Pritom ćete oštetiti DNK kože, dobiti lažnu sigurnost (jer već imate "temeljnu boju"), manje ćete koristiti zaštitne kreme i, na kraju, još ćete više oštetiti DNK kože prekomjernim izlaganjem UV zrakama. Tamnoputi ne trebaju zaštitnu kremu za sunčanje I ovo je, naravno, potpuno pogrešno. Najbolji dokaz je snažno povećanje postotka Afroamerikanaca i Hispanoamerikanaca u ukupnom broju oboljelih od raka kože, a uz to im je i stopa preživljavanja bitno niža nego kod bijelaca. Stoga, bez obzira na prirodno tamniju kožu, ponašajte se kao da je nemate i zaštitite se. Ne treba nam zaštitna krema na putovanjima automobilom Naravno, pogrešno. Teško da ćete izgorjeti kao da ste na plaži, no bočni i stražnji prozori automobila, za razliku od vjetrobrana, obično nemaju nikakvu zaštitu od UVA i UVB zraka, što znači da će doći do oštećenja kože koja ne možemo vidjeti golim okom. Istraživanje Akademije za dermatologiju pokazalo je da ljudi koji se puno voze automobilom imaju veću vjerojatnost za dobivanje raka kože na strani tijela koja je češće izložena suncu. Odjeća je dobra zaštita od sunca Djelomično je istina, no to uvelike ovisi o materijalu koji nosite. Neke čvrste tkanine već imaju dodane kemijske spojeve koji poboljšavaju zaštitu, no obične ljetne majice predstavljaju zaštitu jednaku zaštitnom faktoru između 3 i 15, što i nije neka zaštita, a čim se smoče više ne predstavljaju nikakvu zaštitu. Kreme za sunčanje štite od UVA i UVB zračenja Ponovno djelomično, jer su neke namijenjene samo zaštiti od UVA zračenja, tako da ako nije vidljivo istaknuto na pakiranju treba detaljno pročitati deklaraciju. SPF faktor zaštite odnosi se samo na UVB zračenje, a neki sastojci kao titan dioksid i cink oksid štite vas od obje vrste zračenja. Zaštitni faktor SPF 20 štiti dvostruko više od SPF 10 Ma kako logično ovo zvučalo, nije istina. Primjerice, SPF 15 blokira 93% UVB zraka, dok SPF 30 blokira 97%, a SPF 50 98%. Stoga, uvijek uzmite jači zaštitni faktor i mažite se češće. Još riječ dvije o sunčanim naočalama. Vrlo je važno štititi oči tijekom sunčanja, a za to vam trebaju naočale koje moraju imati istaknutu napomenu da štite od UV zračenja, jer samo polarizirane leće ne blokiraju UV zrake. Sunčane naočale koje blokiraju UV zračenje sve do 400 Nm su najbolje, jer zaustavljaju sve UV zrake.