(CBS News) – Putting in extended days at the office may do more than just stress you out and cramp your social life. New research shows working long hours could pose a serious risk to your heart.

Specifically, researchers found that working 55 hours or more per week is associated with a 33 percent higher risk of stroke and a 13 percent greater risk of developing coronary heart disease when compared to people who work 35 to 40 hours a week. The findings were published Wednesday in The Lancet.

“This was really the first big study that looked at working long hours and whether it increases your risk of stroke,” CBS News medical contributor Dr. Tara Narula said on “CBS This Morning.”

In the largest study in the field so far, Mika Kivimäki, professor of epidemiology at University College London, and colleagues did a systematic review of published studies and unpublished individual-level data examining the relationship between longer working hours and the effect on the heart. The studies included data on over 600,000 people from the United States, Europe and Australia.


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