防晒霜可延缓皮肤光照老化进程
文章来源:未知 文章作者:enread 发布时间:2013-06-11 06:53 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
最近发表在美国《内科学年鉴》上的一份研究报告指出,每天使用防晒霜可延缓皮肤因光照老化的进程,同时降低患皮肤癌的风险。
 
A new study has found that applying sunscreen every day can do more than lower your risk of skin cancer — it can also drastically reduce the effects of photoaging(光老化), or the way frequent sun exposure can make your skin look older. And there's more good news: Even if you slacked off on sunscreen in your youth, middle age isn't too late to benefit from slathering it on.
 
"It has been a source of frustration1 for us that for some sections of the community, the sun-safe message does not seem to be getting through," Dr. Adele Green, a professor at the Queensland Institute of Medical Research at the University of Queensland in Australia, said. "We now know that protecting yourself from skin cancer by using sunscreen has the added bonus of keeping you looking young."
 
The study, published this week in the Annals of Internal Medicine, also looked at whether taking beta-carotene supplements could have an anti-aging effect. Beta-carotene is a type of antioxidant known as a carotenoid(类胡萝卜素), and has been linked to a reduced risk of skin cancer.
 
For the randomized-controlled trial, the researchers assigned 903 participants to one of four groups: Those who used broad-spectrum sunscreens daily and take 30 milligrams of beta-carotene, those who used daily sunscreen and took a placebo2, those who took the beta-carotene but only used sunscreen periodically, and those who used sunscreen periodically and took a placebo. (All participants were age 55 or younger; the researchers decided3 it would not be ethical4 to have a group in which participants used no sunscreen at all.)
 
The two daily sunscreen groups used UVA/UVB blocking products with a SPF (sun protection factor) of 15 or higher; they applied5 the product to their head, neck, arms, and hands each morning after bathing, and reapplied it every few hours. The other two groups applied sunscreen where and when they thought they needed it.
 
The researchers tracked participants for four and a half years, and used putty-like skin molds to document fine lines and wrinkles. They found that the groups using sunscreen every day showed 24 percent less skin photoaging than those who only applied it periodically. The results were the same regardless of age, so even the middle-aged6 participants benefited from regular sunscreen use.
 
"The cost-effectiveness of promoting daily sunscreen use based on skin cancer prevention alone is probably substantially higher after accounting7 for the additional prevention of skin photoaging," wrote the researchers in their report.
 
Taking beta-carotene had no overall effect on skin aging, the researchers added.
 
In 2012, the U.S. Food and Drug Administration decided that sunscreen makers8 could state on the labels that their products reduced the risk of skin cancer and skin aging if used as directed, as long they also advised people to take other precautions, like reapplying sunscreen at least every two hours (more often if you're sweating or swimming), avoiding going out when the sun is most intense (usually between 10 a.m. and 2 p.m.), and wearing long-sleeved shirts, pants, and broad-brimmed hats to shield the skin when possible.
 
If you only have a few minutes in the morning, it makes sense to apply sunscreen to the areas most likely to see the sun — your face, neck, and hands. All types of sunscreen, even "sport" or "waterproof9" formulas, need to be reapplied regularly, and you should wear sunscreen even if you spend all day driving or working indoors, advises Dr. Jaliman, the cosmetic10 dermatologist11(皮肤科医生).


点击收听单词发音收听单词发音  

1 frustration 4hTxj     
n.挫折,失败,失效,落空
参考例句:
  • He had to fight back tears of frustration.他不得不强忍住失意的泪水。
  • He beat his hands on the steering wheel in frustration.他沮丧地用手打了几下方向盘。
2 placebo placebo     
n.安慰剂;宽慰话
参考例句:
  • The placebo has been found to work with a lot of different cases.人们已发现安慰剂能在很多不同的病例中发挥作用。
  • The placebo effect refers to all the observable behaviors caused by placebo.安慰剂效应是指由安慰剂所引起的可观察的行为。
3 decided lvqzZd     
adj.决定了的,坚决的;明显的,明确的
参考例句:
  • This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
  • There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。
4 ethical diIz4     
adj.伦理的,道德的,合乎道德的
参考例句:
  • It is necessary to get the youth to have a high ethical concept.必须使青年具有高度的道德观念。
  • It was a debate which aroused fervent ethical arguments.那是一场引发强烈的伦理道德争论的辩论。
5 applied Tz2zXA     
adj.应用的;v.应用,适用
参考例句:
  • She plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
6 middle-aged UopzSS     
adj.中年的
参考例句:
  • I noticed two middle-aged passengers.我注意到两个中年乘客。
  • The new skin balm was welcome by middle-aged women.这种新护肤香膏受到了中年妇女的欢迎。
7 accounting nzSzsY     
n.会计,会计学,借贷对照表
参考例句:
  • A job fell vacant in the accounting department.财会部出现了一个空缺。
  • There's an accounting error in this entry.这笔账目里有差错。
8 makers 22a4efff03ac42c1785d09a48313d352     
n.制造者,制造商(maker的复数形式)
参考例句:
  • The makers of the product assured us that there had been no sacrifice of quality. 这一产品的制造商向我们保证说他们没有牺牲质量。
  • The makers are about to launch out a new product. 制造商们马上要生产一种新产品。 来自《简明英汉词典》
9 waterproof Ogvwp     
n.防水材料;adj.防水的;v.使...能防水
参考例句:
  • My mother bought me a waterproof watch.我妈妈给我买了一块防水手表。
  • All the electronics are housed in a waterproof box.所有电子设备都储放在一个防水盒中。
10 cosmetic qYgz2     
n.化妆品;adj.化妆用的;装门面的;装饰性的
参考例句:
  • These changes are purely cosmetic.这些改变纯粹是装饰门面。
  • Laughter is the best cosmetic,so grin and wear it!微笑是最好的化妆品,所以请尽情微笑吧!
11 dermatologist dermatologist     
n.皮肤科医师
参考例句:
  • I think you should see a dermatologist first.我想你应当先看皮肤科大夫。
  • The general practitioner referred her patient to a dermatologist.家庭医生把她的病人交给了皮肤科医生。
TAG标签: skin cancer sunscreen
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