Soccer fans take note: if your anger over a lost game affects your heartbeat, you could be at greater risk of developing a dangerous heart arrhythmia in the future.

The concept that rage can be risky is not entirely new. Reuters cites previous research showing that “earthquakes, war or even the loss of a World Cup Soccer match” can increase death from heart attacks.

Rachel Lampert of Yale University in New Haven, Connecticut and her colleagues report in the Journal of the American College of Cardiology that they monitored the heart rate of 62 patients with a history of heart disease. The patients were subjected to “a mental stress protocol” in which they recounted a recent event that made them angry. Those patients who experienced an anger-induced change in their heartbeats were more likely to later develop serious irregularities in their heart rate over the next year.

Before you rush out to enroll in anger management classes, there are a few points to keep in mind. The researchers began with a pool of patients who were already vulnerable to heart arrhythmia. And what they’ve found is a correlation, but doesn’t establish causation. So whether those anger-induced affects on the heart actually contributed to future arrhythmia remains unclear.

That said, a little anger management never hurts. CNN offers a few tips from the Mayo Clinic in its story.