The most solid evidence for potentially negative heart changes associated with long-term serious endurance training relates to elevated coronary artery calcium (CAC) scores. The gradual build-up of calcium-rich plaques causes narrowing and stiffening of the coronary arteries, which supply blood to your heart muscles.
Richvideo t1_j4ji3zi wrote
Reply to Clinical studies confirm that endurance exercise training increases muscle antioxidant capacity and provides protection against oxidative stress. by johnhemingwayscience
The most solid evidence for potentially negative heart changes associated with long-term serious endurance training relates to elevated coronary artery calcium (CAC) scores. The gradual build-up of calcium-rich plaques causes narrowing and stiffening of the coronary arteries, which supply blood to your heart muscles.
https://www.outsideonline.com/health/training-performance/endurance-athletes-heart-health-research-2021/