Ann Intern Med:防晒霜新功能抵抗皱纹和皮肤松弛

2013-06-06 Ann Intern Med 生物360

一项新研究发现,坚持每天使用防晒霜可以在一定程度上减缓甚至防止皱纹和皮肤松弛的形成。皮肤科医生一直都在建议人们使用防晒霜以减缓衰老效应,不过研究人员称,这是第一次在研究中显示出对皮肤外表造成的实际效果。 该研究在澳大利亚招募了900名年龄在25岁到55岁之间的白种人作为研究对象,强烈的日照是那里生活的常态。他们大多皮肤白皙,几乎都曾被太阳晒伤过。多数人至少偶尔会使用防晒霜,三分之二的人在阳光下会

一项新研究发现,坚持每天使用防晒霜可以在一定程度上减缓甚至防止皱纹和皮肤松弛的形成。皮肤科医生一直都在建议人们使用防晒霜以减缓衰老效应,不过研究人员称,这是第一次在研究中显示出对皮肤外表造成的实际效果。

该研究在澳大利亚招募了900名年龄在25岁到55岁之间的白种人作为研究对象,强烈的日照是那里生活的常态。他们大多皮肤白皙,几乎都曾被太阳晒伤过。多数人至少偶尔会使用防晒霜,三分之二的人在阳光下会戴帽子。

然而研究人员想知道的是,如果连续四年半持续使用广谱防晒霜,会是怎样的结果。他们让一半的参与者保持和往常一样的习惯,另一半开始每天抹防晒霜。

研究的成果本周一发表在了《内科医学年鉴》(The Annals of Internal Medicine)上,报告称,相比那些继续平日习惯的人,每天使用防晒霜的人皮肤明显更有弹性,更光滑。

研究还对将近900人进行随机分组,一部分人服用营养补充剂B-胡萝卜素,另一部分人服用安慰剂,观察补充剂是否有防止皮肤衰老的作用。结果是不能。

研究中的防晒霜这一部分令其他研究人员颇为称道。未参加研究的哥伦比亚大学(Columbia University)皮肤医学教授戴维·R·比克尔斯(David R. Bickers)说,研究“表明大面积持续使用防晒霜可以改变光衰老的进程,而这一进程本是不可避免的”。

波士顿大学医学院(Boston University School of Medicine)皮肤医学教授、《皮肤病学研究期刊》(The Journal of Investigative Dermatology)编辑芭芭拉·A·基尔克雷斯特(Barbara A. Gilchrest)也觉得这项研究是有说服力的。

同样和本次研究无关的基尔克雷斯特指出,研究对象并非积习已久的暴晒一族,而是尝试去保护皮肤的人。

“他们没有选那些毫不顾忌太阳的人,然后让他们避开阳光,”基尔克雷斯特说,“每个人本来就已经有相当不错的防晒习惯。”

皮肤病学家说,此前没有人做过这种研究是因为这个想法本身就让人望而却步。几百名健康的人要连续几年按照要求去安排生活。

被指定每天采取防晒措施的人,使用的是防晒因子,也就是SPF值为15的防晒霜,可以过滤92%的阳光射线。一个人如果在10分钟内会被晒伤,那么使用SPF 15的防晒霜后会延长到150分钟。那些被指定使用防晒霜的人甚至要拿防晒霜瓶子出来称重,以确保他们都在使用。

“让人们在一段持续的时间内遵照要求行事绝对是种成就,”比克尔斯说,“在我看来,他们可以得到如此程度的配合是很了不起的。”

防晒霜研究的经费来自澳大利亚国家健康和医学研究委员会(National Health and Medical Research Council of Australia)。没有防晒霜制造商参与。

这项研究只涉及生活在悉尼以北650英里(约合1000公里)处的南博尔的白人。参与者需要让研究人员在研究开始时和结束后为他们的皮肤制作硅胶模型,以评估他们的皮肤变化。

该项目的首席研究员、昆士兰医学研究院(Queensland Institute of Medical Research)的资深科学家阿黛尔·C·格林(Adele C. Green)和她在研究院以及昆士兰大学(University of Queensland)的同事此前就已经发现,用这种方法可以得到跟皮肤活检一样的信息。在活检中,皮肤病学家要观察的是弹性蛋白,这种弹性组织是会随着衰老而退化的,成为皱纹和皮肤松弛的原因之一。

格林提醒人们注意,55岁以上的人在使用防晒霜后是否能有更年轻的皮肤,本项研究并没有给出回答。她说55岁以后皮肤的衰老效应开始起主导作用。而且紫外线照射对皮肤起到的是一种累积的效果。

比较晚开始使用防晒霜的人能有什么样的效果,也不得而知。但格林还是建议使用,因为可以预防皮肤癌。

本研究还有一个没有回答的问题是,肤色较暗的人是否可以使用防晒霜来预防皮肤皱纹和松弛。

基尔克雷斯特说,比起肤色较暗的人,皮肤白皙的人要面对的光衰老和皮肤癌问题会多得多。但如果非要问暗色皮肤的人使用防晒霜是否有助于保持年轻的皮肤,她说她推测应该是可以的。

Sunscreen and Prevention of Skin Aging: A Randomized Trial
Background
Sunscreen use and dietary antioxidants are advocated as preventives of skin aging, but supporting evidence is lacking.
Objective
To determine whether regular use of sunscreen compared with discretionary use or β-carotene supplements compared with placebo retard skin aging, measured by degree of photoaging.
Design
Randomized, controlled, community-based intervention. (Australian New Zealand Clinical Trials Registry: ACTRN12610000086066).
Setting
Nambour, Australia (latitude 26° S).
Patients
903 adults younger than 55 years out of 1621 adults randomly selected from a community register.
Intervention
Random assignment into 4 groups: daily use of broad-spectrum sunscreen and 30 mg of β-carotene, daily use of sunscreen and placebo, discretionary use of sunscreen and 30 mg of β-carotene, and discretionary use of sunscreen and placebo.
Measurements
Change in microtopography between 1992 and 1996 in the sunscreen and β-carotene groups compared with controls, graded by assessors blinded to treatment allocation.
Results
The daily sunscreen group showed no detectable increase in skin aging after 4.5 years. Skin aging from baseline to the end of the trial was 24% less in the daily sunscreen group than in the discretionary sunscreen group (relative odds, 0.76 [95% CI, 0.59 to 0.98]). β-Carotene supplementation had no overall effect on skin aging, although contrasting associations were seen in subgroups with different severity of aging at baseline.
Limitation
Some outcome data were missing, and power to detect moderate treatment effects was modest.
Conclusion
Regular sunscreen use retards skin aging in healthy, middle-aged men and women. No overall effect of β-carotene on skin aging was identified, and further study is required to definitively exclude potential benefit or potential harm.

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    2013-06-24 wuamcswwqjat

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    2013-06-21 vdpngqbwmsbj

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