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Most people usually apply sunscreen that leaves less than half of the protection against harmful ultraviolet rays, according to scientists.
A new study found that when sunscreen is applied in a typical way,% of the protection that they can expect according to the sun protection factor (SPF). Most skin cancers are caused by damage caused by exposure to the sun's UV rays.
The study showed that skin protection against harmful lesions induced by known UV rays underlies cancers. and 2.0 milligrams per square centimeter, while most people apply only one coat of 0.75.
Scientists suggest that we could increase our protection by wearing a higher SPF to compensate for the tendency to apply too thin sunscreen. "Since most people do not use the solar filters tested by the manufacturers, it is better for people to use a much higher SPF than they deem necessary," says Antony Young, Professor of Experimental Photobiology at King's College London
. According to the manufacturer's recommendations, the sun protection factor is based on the assumption that the sunscreen is applied at a thickness of 2 milligrams per square centimeter, but the average user applies generally a lot less sun protection, according to previous studies.
get a lot less protection than they think, "said Young." For example, if you get SPF20 and you use a lower thickness of 0.75 milligrams per square centimeter, your level of protection could be as low as SPF4. "
To know how to protect sunscreen when it is applied so as: The researchers measured the amount of damage to the DNA in the skin of 16 volunteers which wore different thicknesses of sunscreen when they were exposed to UV light.
The study participants were divided into two groups of eight: one group received a single dose of UV radiation to mimic exposure to the sun, and the second group received multiple doses over a five-day period to simulate continuous exposure during the holidays
their sunscreen was applied and skin biopsies s immediately after UV exposure. The sunscreen tested in the study, published in the journal Acta Dermato-Venereologica, complied with the European regulations
Scientists also modified the amount of UV radiation during the experiment to try to replicate conditions in classic holiday destinations like Tenerife. 19659011] Skin biopsies revealed that vacation group members who wore sunscreen at the thickness recommended by the manufacturer also had the best protection against damage, even after being exposed to high doses of alcohol. UV for several days. "There is no doubt that sunscreen provides significant protection against the carcinogenic impact of the sun's ultraviolet rays," Young said. "However, what this research shows is that the way that sunscreen is applied plays an important role in determining its effectiveness."
Nina Goad of the British Association of Dermatologists said, "This research demonstrates why it is so important to choose an SPF of 30 or more." In theory, an SPF of 15 should be enough, but we know that in real life situations, we need the added protection afforded by a higher SPF.
"An additional consideration is that when we apply sunscreen, we are She added that people should not be proud only to sunscreen for sun protection, but should also use clothes and shade.
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