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2010-01-21 07:26:00
By MARIA CHENG, AP Medical Writer Maria Cheng, Ap Medical Writer Wed Jan 20,
4:55 pm ET
LONDON 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 bad 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 occurs.
Research is preliminary, but several studies suggest people who spend most of
their days sitting are more likely to be fat, have a heart attack or even die.
In an editorial published 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 physical activity to highlight the
dangers of sitting.
While health officials have issued guidelines recommending minimum amounts of
physical activity, they haven't suggested people try to limit how much time
they spend in a seated position.
"After four hours of sitting, the body starts to send harmful signals,"
Ekblom-Bak said. She explained that genes regulating the amount of glucose and
fat in the body start to shut down.
Even for people who exercise, 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 but still spend a lot of
time sitting might get more benefit if that exercise were spread across the
day, rather than in a single bout.
That wasn't welcome news for Aytekin Can, 31, who works at a London financial
company, and spends most of his days sitting in front of a computer. Several
evenings a week, Can also teaches jiu jitsu, a Japanese martial art involving
wrestling, and also does Thai boxing.
"I'm sure there are some detrimental effects of staying still for too long, but
I hope that being active when I can helps," he said. "I wouldn't want to think
the sitting could be that 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 more had a higher
death risk, independently of whether or not they exercised.
"We don't have enough evidence yet to say how much sitting is bad," said Peter
Katzmarzyk of the Pennington Biomedical Research Center in Baton Rouge, who led
the Canadian study. "But it seems the more you can get up and interrupt this
sedentary behavior, the better."
Figures from a U.S. 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 figure out just how much sitting is
dangerous, and what might be possible to offset those effects.
"People should keep exercising because that has a lot of benefits," Ekblom-Bak
said. "But when they're in the office, they should try to interrupt sitting as
often as possible," she said. "Don't just send your colleague an e-mail. Walk
over and talk to him. Standing up."