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Sufficient sleep lowers risk of heart attack 11-03-08
An extra hour of sleep due to the change in daylight saving time in the fall
could prevent some people from suffering heart attack, a new study suggests.
The study led by researchers in Sweden found that the risk of a heart attack
dropped during the first week after the clocks were set back and people have an
extra hour of sleeping.
The study also found the risk of heart attack was higher in the first week after
clocks were set forward in the springtime and people changed their time schedule
potentially having one hour less sleep.
The study was conducted by Drs. Imre Janszky of the Karolinska Institute and
Rickard Ljung of the National Board of Health and Welfare and published in the
New England Journal of Medicine.
The researchers found that during the shift to daylight saving time, women
seemed more likely to have heart attack than men. And men were more likely to be
protected during the Monday in the fall.
Sleeping time has been linked to the risk of heart attack. A study published in
the July 2002 issue of the journal Occupational and Environmental Medicine
showed men who work 60 or more hours a week and do not get regular sleep may
double their risk of heart attack.
The authors suggest that insufficient sleep increases blood pressure and heart
rate while chronic stress may induce abnormalities in heart function.
The researchers said the optimal working time is 40 hours a week and those who
work longer should get enough sleep and have at least two days of rest in a
But people have different opinions on how daylight saving time change affects
the risk of heart attack and some said other risk factors could also affect the