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Showing posts with label Tanning beds may be even riskier than thought. Show all posts
Showing posts with label Tanning beds may be even riskier than thought. Show all posts

Sunday 9 October 2011

 

New research published online Oct. 6 in the Journal of Investigative Dermatology suggests that the main type of ultraviolet rays used in tanning beds -- UVA1 -- may penetrate to a deep layer of skin that is most vulnerable to the cancer-causing changes caused by UV rays. The new study comes as the U.S. Food and Drug Administration considers banning the use of tanning beds among children under 18. The American Academy of Pediatrics is on record that it supports such a ban. In the study, 12 volunteers were exposed to UVA1 and UVB rays on their buttocks. (One difference in the waves is length: UVB waves are shorter.) The UVA1 was more damaging to the skin's basal layer then the UVB light. The UVA1 induced a type of lesion called thymine dimers on the deeper basal layers of the skin. UVB radiation caused more of these lesions, but they did not go as deep, and thus may be less likely to cause the changes linked to skin cancers. "The doses we used were comparable for erythema -- sunburn -- for UVA and UVB. That would be roughly equivalent to the doses needed for tanning in each spectrum," said study co-author Antony R. Young, a professor at the St. John's Institute of Dermatology at King's College School of Medicine in London. "Indoor tanning is like smoking for your skin," said Dr. Doris Day, a dermatologist at Lenox Hill Hospital in New York City. "It's the single worst thing you can do in terms of skin cancer and premature aging." Many indoor tanning salons advertise that tanning beds can help boost the body's production of vitamin D, known as the sunshine vitamin because skin makes it when exposed to the sun's rays. "This is nonsense and an excuse," Day said. "We know people burn in tanning beds and that UVA and UVB are toxic." Teens are particularly vulnerable, she said. "They are immortal in their mind, and skin cancer and aging seem a long ways away." Melanoma, a potentially fatal form of skin cancer, "is not an old person's disease," she said. The new study provides "a little bit more muscle in helping to warn people about the dangers of tanning, but an FDA ban is what we need," she added. "I do think there should be legislation on sunbed use under 18 years of age," said Young, who added that such use is already prohibited in England. John Overstreet, executive director of the Indoor Tanning Association, a Washington, D.C.-based trade group representing the industry, said that if there was science to back up many of these claims, the FDA would have acted by now. The agency has been mulling these claims since March 2010, he noted. What's more, the new study is about ultraviolet radiation, not tanning beds, he said. "Tanning beds have the same ratio of UV waves as the sun. UVA-1 is the primary wave length emitted by the sun, too," he said. "The sun and indoor tanning pose the same risks and benefits if you don't burn. There is no science that shows non-burning exposure to sun or a sun lamp causes cancer."

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