完形填空。
Here's a new warning from health experts: Sitting is deadly. Scientists are increasingly warning that sitting
for prolonged periods-even if you also exercise regularly-could be   1   for your health. And it doesn't matter
where the sitting takes place-at the office, at school, in the car or before a computer or TV-just the overall
number of hours it   2   .
Research is preliminary, but several studies   3   people who spend most of their days sitting are more likely
to be fat, have a heart attack or even die.
In an editorial   4   this week in the British Journal of Sports Medicine, Elin Ekblom-Bak of the Swedish
School of Sport and Health Sciences suggested that authorities rethink how they define   5   activity to highlight
the dangers of sitting.
While health officials have issued guidelines   6   minimum amounts of physical activity, they haven't
suggested people try to limit how much time they spend in a seated   7   .
"After four hours of sitting, the body starts to send   8   signals," Ekblom-Bak said. She explained that genes
regulating the amount of glucose and fat in the   9   start to shut down.
Even for people who  10  , spending long stretches of time sitting at a desk is still harmful. Tim Armstrong,
a physical activity expert at the World Health Organization, said people who exercise every day-  11  still spend
a lot of time sitting-might get more benefit if that exercise were spread across the day,  12  in a single bout.
That wasn't  13  news for Aytekin Can, 31, who works at a London financial company, and spends most
of his days sitting  14  a computer. Several evenings a week, Can also teaches jiu jitsu, a Japanese martial art
  15   wrestling, and also does Thai boxing.
"I'm sure there are some detrimental  16  of staying still for too long, but I hope that being  17  when I can
helps," he said. "I wouldn't want to think the sitting could be  18  dangerous."
Still, in a study published last year that tracked more than 17,000 Canadians for about a dozen years,
researchers found people who sat  19  had a higher death risk, independently of whether or not they exercised.
Figures from a US survey in 2003-2004 found Americans spend more than half their time sitting, from
working at their desks to sitting in cars.
Experts said more research is needed to  20  just how much sitting is dangerous, and what might be
possible to offset those effects.

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