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青少年的睡眠是很重要 睡不好可能会患心脏病!









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发表于 2018-6-30 18:16:11 | 显示全部楼层 |阅读模式
  Most kids don’t get enough sleep, and that may put them on a path to future
heart trouble, a new study finds.
          Young teens who slept less than seven hours a night tended to have more
body fat, elevated blood pressure and less healthy cholesterol levels -- all bad
for the heart, researchers say.
          Heart disease remains a leading killer, said lead researcher Elizabeth
Cespedes Feliciano. She’s a staff scientist with the Kaiser Permanente Northern
California Division of Research in Oakland, Calif.
          "We really want our youth to be on a healthy trajectory," Feliciano said,
"and it’s a little alarming you would see adverse cardiometabolic profiles
emerging even at an age as young as 13."
          But it seems that very few kids are getting the kind of nightly slumber
that would protect their future heart health.
          Average sleep duration for kids in the study was only a little over seven
hours per day, researchers found.
          In fact, only 2.2 percent of the kids met or exceeded the average
recommended sleep duration for their age group -- nine hours per day for kids 11
to 13 and eight hours per day for teens 14 to 17.
          事实上,只有2.2 %的孩子达到或超过了他们年龄组的平均推荐睡眠时间,11到13岁的孩子每天9小时,14到17岁的孩子每天8小时。
          Further, nearly a third of kids slept less than seven hours.
          "I was really struck by how little these adolescents are sleeping," said
Dr. Andrew Varga, a sleep medicine specialist with the Icahn School of Medicine
at Mount Sinai in New York City. "It’s not totally surprising, given what I know
about kids and their habits, but you would think there would be some drive for
these kids to sleep more because they have a high sleep need."
          Prior studies have shown that inadequate sleep boosts the odds for obesity.
But Feliciano’s team wanted to see whether a lack of sleep also affects other
heart disease factors for kids.
          So, they turned to 829 teenagers participating in Project Viva, a long-term
study that recruited pregnant moms and has tracked them and their children for
nearly 14 years.
          At an average age of 13, the kids were asked to put on a wrist-worn
movement sensor at bedtime that would track both their duration of sleep and
whether they had restless sleep, Feliciano said.
          The kids wore the sensors of seven to 10 days. They also underwent a series
of screenings for heart health risk factors.
          Teens with shorter sleep duration and more restless sleep wound up having
the least healthy profiles. They had wider waist circumference, increased body
fat, higher blood pressure, and lower levels of "good" HDL cholesterol.
          Although cause-and-effect couldn’t be shown in this stuidy, Feliciano
believes the lack of good sleep did help trigger these risk factors, given prior
          "We know from short-term experimental studies that when you deprive someone
of sleep or interrupt their sleep, that has effects on some of the same
cardiometabolic risk factors examined in this study," she said.
          There are a number of ways sleep can affect heart health, Feliciano
          Sleeplessness can spur changes in appetite, and also has been linked to
decreased levels of physical activity. "You’re awake longer, but you’re often
fatigued so you might not be engaging in sports or exercise," Feliciano
          Sleep also is important in the regulation of blood pressure and blood
sugar, Varga said.
          "It’s known that sleep is really helpful for lowering blood pressure,"
Varga said. "There are natural dips in blood pressure that occur throughout the
night. When you’re sleeping less, that happens less and offers less blood
pressure control."
          So what’s keeping kids up at night?
          Feliciano believes screen time is probably causing most of the sleep
          "Television viewing is still the dominant way these children are consuming
media, but small screens are a concern as well, because you can bring those
right into your bedroom," Feliciano said. "I do think screen media is a culprit
for short and disrupted sleep, especially in this population that’s very plugged
          There’s also a general lack of awareness among parents regarding the sleep
needs of teenagers, Varga said.
          "There’s an impression that as kids become teenagers, we think of them as
small adults who don’t need as much sleep as younger children," Varga said.
"That’s totally not true. Even up to the early 20s, sleep needs are higher than
that of a mature adult."
          Parents need to put their foot down when it comes to screen time at
bedtime, Feliciano said.
          "I would recommend the bedroom be a screen-free zone," she said. "I think
that would improve sleep duration and quality in adolescents."
          The study was published June 15 in the journal Pediatrics.

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