A study from University College London found an association between working long hours and atrial fibrillation.
The study looked at data on 85,494 people who were mainly middle-aged men and women in the U.K., Denmark, Finland and Sweden.
They were then separated into two groups according to their work habits, with those with working schedules between 35 and 40 hours per week used as the control group. None of the participants had AF before the study.
Researchers followed participants for 10 years and found that an average of 12.4 per 1,000 people had developed AF. However, among the participants who worked 55 hours or more, that figure rose to 17.6 per 1,000 people.
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