Study: Heart attacks rise after time change
Print Edition
TURNING the clocks forward an hour in the spring for daylight saving time is followed by a spike in heart attacks on the Monday afterward, a US study said yesterday.
But when the clocks fall back and people gain an hour of sleep, there is a drop in heart attacks on Tuesday, said the research presented at the American College of Cardiology conference.
The findings showed no change in the total number of heart attacks during the entire week following any clock change, indicating the spike seen on Monday evens out in following days.
But knowing a surge in patients can be expected could help doctors better prepare, said lead author Amneet Sandhu, cardiology fellow at the University of Colorado in Denver.
“It may be that we as people are very sensitive to the loss of even one hour’s sleep,” Sandhu said.
“It may mean that people who are already vulnerable to heart disease may be at greater risk right after sudden time changes.”
The study was based on a database of hospitals in Michigan.
There was a 25 percent jump in the number of heart attacks occurring the Monday after the spring time change — or a total of eight additional heart attacks — and a 21 percent drop the Tuesday after the autumn return to standard time.
Most heart attacks occur on Monday, previous research has found.
But by looking at hospital data over four consecutive years, researchers saw a consistent 34 percent increase in heart attacks from one week to the next at the spring time change.
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