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(单词翻译:双击或拖选)
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.
Parents wring1 their hands over infant sleep patterns. And so when those patterns change, parents tend to panic. But if your baby is sleeping more or napping at weird2 times, maybe he or she is just growing. So says a study in the journal Sleep.
It's known that levels of growth hormone3 rise during certain stages of sleep. So researchers wanted to know more about the link between sleep and growth. They recruited the parents of 23 infants. The parents took careful real-time notes on infant sleep patterns for between four and 17 months. They also noted4 whether the babies were breast- or bottle-fed, and whether they had signs of illness such as rashes or diarrhea. And the babies' body length and weight were measured regularly.
The researchers found that periods where infants slept more overall corresponded with growth spurts5 and also a gain in weight and body fat. Both genders6 experienced that correlation7, though boys had more and shorter sleep episodes than girls. The scientists note that increases in sleep may lead to increases in waking, as growing bones produce growing pains. So if your baby's sleeping a little funny, maybe she's just growing up.
"Rock a bye baby, on the tree top."
Thanks for the minute. For Scientific American's 60-Second Science, I'm Cynthia Graber.
"When the wind blows, the cradle will rock.Rock,rock,rock a bye baby."
1 wring | |
n.扭绞;v.拧,绞出,扭 | |
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2 weird | |
adj.古怪的,离奇的;怪诞的,神秘而可怕的 | |
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3 hormone | |
n.荷尔蒙,激素,内分泌 | |
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4 noted | |
adj.著名的,知名的 | |
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5 spurts | |
短暂而突然的活动或努力( spurt的名词复数 ); 突然奋起 | |
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6 genders | |
n.性某些语言的(阳性、阴性和中性,不同的性有不同的词尾等)( gender的名词复数 );性别;某些语言的(名词、代词和形容词)性的区分 | |
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7 correlation | |
n.相互关系,相关,关连 | |
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