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    New research of nearly 1,000 long-time endurance athletes found that heavy training may contribute to an increased chance of developing atrial fibrillation

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    • When too much exercise is bad for your heart: years of heavy endurance training and competition may contribute to an increased chance of developing atrial fibrillation, especially in men. https://t.co/MwWLqlobW1 via @GretchenReynold