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我选择裸奔…… – 译学馆
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我选择裸奔……

Should You Walk or Run When It's Cold?

当天寒地冻
When it’s cold out
你却衣衫单薄
and you didn’t dress for the weather
还无地御寒
and you’re far from shelter
此刻你要做出重要决定
You have a crucial decision to make:
你是要奔跑(或滑雪)以取暖呢
should you run (or ski) to try to warm up,
还是慢走以抵御寒风
or go slow and avoid the cooling effects of wind?
天寒地冻时如果你静止不动
When it’s cold out and you’re not moving,
你散的热能加热你周围的空气
the heat you lose goes to heating up the air around you,
这能形成薄薄的保温层让你不至于降温太快
forming a slightly warmer protective layer so you don’t cool off as quickly.
但如果你开始移动(或者开始刮风)
But if you’re moving (or if it’s windy),
你将暴露于新鲜却寒冷的空气中
you’rebeing exposed to some amount of fresh, new, cold air
你跑得越快就越冷
more of it the faster you go.
你跑出了你加热的空气
You’re literally running away from the air you warmed
你将比待在原地降温更快
and so you cool off faster than if you stayed put.
而且一旦你跑得足够快
Though once you’re going fast enough,
空气保温层就会完全流失
the protective layer of air will be pretty much entirely gone
总的来讲 不管你跑得多快 你会以同样的速度降温
And you’ll basically lose heat at the same rate regardless of how fast you’re running.
另一方面 在奔跑时 我们体内能产生大量热量
Now, when humans run, we also generate a fair amount of heat inside our bodies.
而事实上 我们活动时每公斤体重只会产生大概恒定不变的热量
In fact,we produce a roughly constant amount of heat per kilometer traveled,
所以 既定时间内 你跑得越快 你会产生越多热量
so the faster you go, the more heat you generate any given minute.
因为奔跑产生的热量会稳定地增加
Because the heat generated by running has a steady increase,
而你周围的保温层虽然迅速流失 但流失速度相对缓慢
while your protective layer of warm air goes away quickly at low speeds,
结果是出现了速度的“限制范围”
it turns out that there’s a kind of “forbidden range” of speeds
此范围里走路不能御寒
where it’s not worth walking,
慢跑也不能
or even running slowly,
因为待在原地更有助于保温
since you’d lose less heat standing still.
所以要抵消奔跑时空气活动造成的热量流失
So what’s the minimum speed where the heat you generate running
你至少应该达到多大的奔跑速度呢
finally balances out the additional heat you lose due to air movement?
好的 让我们大概估计一下一个奔跑的成年裸男的体表面积和热量生成
Well, using some estimations for the surface area and energy generation of an adult human running naked
还有风对于热量流失的作用
and the effects of wind on heat loss
我发现 在冰天雪地之下
I found that when it’s freezing outside ,
你大概要以五分钟跑完一英里(三分钟每公里/十二迈)的速度才能保证比待在原地暖和
you need to be able to run roughly a 5 minute mile to be better off moving than staying put.
而如果气温更低的情况下 你得跑得比这个速度更快
And faster, if it’s colder out.
而这也并不是说你没有丢失热量
And this wouldn’t even mean you’re not losing heat
这只是说在那个跑速时 奔跑比静止不动能让你丢失相对较少的热量
it’s just the point at which you lose less heat running than you do standing still.
而如果五分钟跑一英里听起来太难了
Now if 5 minutes a mile sounds like a challenge,
别担心 你完全可以穿上点衣服
don’t worry. All you need to do is put on some clothing
而穿上的衣服能让你相对于裸男减少一半的热量流失
– like, enough that you’re only losing half as much heat as a naked person
而此时十五分钟跑一英里(相当于快走)就能很好的产热了
and a 15 minute mile (basically a brisk walk), will do just fine.
所以结论是 待在原地减少热量流失
So, either stay put,
或者穿着合适的冬装以保暖
or wear appropriate winter clothing,
或者在雪地里极速裸奔也是个不错的选择
or run naked very very fast through the snow.
事实上 雪会推翻一切推算

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天寒地冻,孤身在外,此时你选择奔跑还是待在原地?最生活化的场景,最科学的态度,最不知所云的公式,还有出人意料的结论

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翻译译者

甘木石

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vicky

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