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This is Scientific American ― 60-Second Science. I'm Jason Goldman.
By now it's almost common knowledge that spending time in nature is good for you.
Areas with more trees tend to be less polluted, so spending time there allows you to breathe easier.
Spending time outdoors has been linked with reduced blood pressure and stress, and seems to motivate people to exercise more.
"So it'll come as no surprise that there's research showing that spending time in nature is good.
I mean, that's been known for millennia. There's dozens of papers showing that."
University of Exeter Medical School researcher Mathew P. White.
"We get this idea, patients are coming to us and they're saying, 'doctor, how long should I spend?'
and the doctor is saying, 'I don't really know.'"
So White and his team decided to find out by using data collected from nearly 20,000 people in England through the Monitor of Engagement with the Natural Environment Survey.
And their answer? Two hours a week.
People who spent at least that much time amid nature―either all at once or totaled over several shorter visits―
were more likely to report good health and psychological well-being than those with no nature exposure.
Remarkably, the researchers found that less than two hours offered no significant benefits.
So what's so special about two hours?
"I have absolutely no idea. Really. We didn't have an a priori guess at what this would be, this threshold.
It emerged. And I'd be lying if I said we predicted this. I don't know."
这里是科学美国人――60秒科学。我是杰森・古德曼。
到目前为止,置身大自然中有益处,这几乎已成为常识。
树木较多的地区往往污染较少,因此,在这种地方呆上一段时间可以让你呼吸更顺畅。
身处户外可与降低血压和压力联系起来,而且似乎能激励人们多锻炼。
“所以,有研究表明置身大自然有好处就不足为奇了。
我的意思是,数千年来人们早已知道这一点。有数十篇文章可以证明。”
埃克塞特大学医学院的研究员马修・怀特说到。
“我们有这个想法是因为,患者会来问我们:‘医生,我应该在大自然中待多长时间?’
而医生总是回答:‘我真的不知道’。”
因此,怀特和团队决定利用数据来找出答案,这些数据来自英格兰自然环境参与监测调查的近2万名参与者。
那他们的答案呢?每周两个小时。
与那些没有接触自然的人相比,在自然环境中至少待上两个小时的人――无论是一次待够两个小时还是数次合计两个小时――
更有可能报告良好的身体和心理健康。
值得注意的是,研究人员发现,少于两个小时没有明显的益处。
那两个小时有什么特别之外?
“我完全不知道。真的。我们没有对这个临界值做先验的猜测。
这个临界值就这样出现了。如果我说我们预测到了这一点,那我就是在撒谎。我是真的不知道。”
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