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(单词翻译)
Head to the mountains, and if the steep trails don't slow you down, the thin air will. There's less oxygen up there—so strenuous1 activity can leave you dizzy, out of breath…or worse. But even though you're beat, biochemical processes are already busy at work, acclimating2 your body.
Scientists investigated those pathways in humans and mice. They found that exposure to low oxygen depletes3 stores of a red-blood-cell protein called eENT1. That's a good thing. Because now other substances that protect your body against low oxygen are free to rapidly accumulate and help the body adapt.
But here's the kicker—once the eENT1 protein goes away, it doesn’t come back. Meaning red blood cells kind of 'remember' their altitude exposure. And that means if you hit the mountains again soon enough, you can acclimate4 faster than you did the first time. The findings are in the journal Nature Communications. [Anren Song et al., Erythrocytes retain hypoxic adenosine response for faster acclimatization upon re-ascent]
There is one caveat5. "In humans the red blood cell lifespan is 120 days." Study author Yang Xia, a biochemist with the UT Health Science Center in Houston. "So the longer you stay at sea level before you re-climb to high altitude, then such memory will gradually disappear." So unless you're a frequent mountain climber—there's really no shortcut6 to acclimatization. Then again, there's no shortcut to the summit, either.
—Christopher Intagliata
1 strenuous | |
adj.奋发的,使劲的;紧张的;热烈的,狂热的 | |
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2 acclimating | |
v.使适应新环境,使服水土服水土,适应( acclimate的现在分词 ) | |
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3 depletes | |
使大大的减少,使空虚( deplete的第三人称单数 ); 耗尽,使枯竭 | |
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4 acclimate | |
v.使服水土,使习惯于新环境 | |
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5 caveat | |
n.警告; 防止误解的说明 | |
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6 shortcut | |
n.近路,捷径 | |
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