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　　运动让你的皮肤更年轻

　　To test that possibility, the scientists first gathered 29 local male and female volunteers ages 20 to 84. About half of the participants were active, performing at least three hours of moderate or vigorous physical activity every week, while the others were resolutelysedentary, exercising for less than an hour per week. Then the researchers asked each volunteer to uncover a buttock.

　　为了证实这种可能性，研究者首先征集了本地的年龄在20-84岁之间共计29位男女志愿者。大约半数志愿者平时喜欢运动，每周至少进行三小时中度或剧烈运动，另外半数是完全就坐着不动的，每周运动时间不足一小时。接着，研究人员请志愿者露出半边臀部。

　　So the researchers next set a group of sedentary volunteers to exercising, after first obtaining skin samples from their buttocks. They began a fairly straightforward endurance training program, working out twice a week by jogging or cycling at a moderatelystrenuouspace, equivalent to at least 65 percent of their maximumaerobiccapacity for 30 minutes.

　　于是，科研人员随即又建立了一个小组，在采集了静坐不动的志愿者的臀部皮肤样本后，让这群人动起来。接着开始进行非常直接的耐力训练，每周练两次，用适度剧烈的速度跑步或骑车，以相当于最高有氧代谢能力至少65%的水平持续运动30分钟。

　　But now the samples looked quite different, with outer and inner layers that looked very similar to those of 20- to 40-year-olds. “I don’t want toover-hypethe results, but, really, it was pretty remarkable to see,” said Dr. Tarnopolsky, himself a middle-aged exerciser. Under a microscope, the volunteers’ skin “looked like that of a much younger person, and all that they had done differently was exercise.”

　　但是在此时，他们的皮肤样本看起来全然不同了，外层和内层皮肤看起来都接近20-40岁的人群。“我不想夸大研究结果，但是真的，研究结果看起来太明显了”塔诺波斯基博士本人人到中年，常常运动。“在显微镜下，志愿者的皮肤‘看起来年轻了很多，而且他们唯一改变的就是开始运动’。”

　　How exercise changes skin composition is not completely clear, but in a separate portion of the study, the researchers checked for alterations in the levels of certain substances created by working muscles. Called myokines, these substances are known to enter the bloodstream andjump-startchanges in cells far from the muscles themselves. In this case, the scientists found greatly augmented levels of a myokine called IL-15 in the skin samples of volunteers after exercise.

　　运动何以改变了皮肤的构成，尚不完全清楚，但在研究的另一部分中，研究人员检查了因运动肌肉而产生的特定物质的含量变化。这些物质被称为肌动蛋白，现在已经知道它会进入血液，并在远离肌肉本身的细胞中启动变化。在该研究中，科研人员发现在运动后，志愿者皮肤样本中一种称为IL-15的肌肉蛋白含量出现了显著增长。

　　The researchers suspect that additional myokines and substances are also involved in the skin changes related to exercise, Dr. Tarnopolsky said, making it unlikely that any IL-15 pill,salveor injection will ever replicate the skin benefits of a workout.

　　Tarnopolsky博士说，研究人员怀疑额外的肌因子和物质也参与了与锻炼有关的皮肤变化，这使得任何IL-15药丸、药膏或注射都不可能复制锻炼对皮肤的益处。

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