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Correspondence
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Volume 359:1966-1968 October 30, 2008 Number 18
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Shifts to and from Daylight Saving Time and Incidence of Myocardial Infarction

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To the Editor: More than 1.5 billion men and women are exposed to the transitions involved in daylight saving time: turning clocks forward by an hour in the spring and backward by an hour in the autumn. These transitions can disrupt chronobiologic rhythms and influence the duration and quality of sleep, and the effect lasts for several days after the shifts.1,2

We examined the influence of these transitions on the incidence of acute myocardial infarction. To calculate the incidence ratio, we compared the incidence of acute myocardial infarction during each of the first 7 days after the spring or autumn . . . [Full Text of this Article]



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