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A recent study on this encourages exercise regardless.

https://openheart.bmj.com/content/9/2/e002154

> Conclusion: Although older male endurance athletes experienced an increased risk of AF, the long-term risk of stroke was substantially reduced compared with non-athletes.

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True, but I think the commentor is referring to the U-shaped relationship of AF and endurance training.

Higher probability with zero exercise, lowest probability at moderate exercise, but an increase in probability as you enter the extreme territory. In my case, 1000+ hours/year for 8 years led to this outcome

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