Cardiac Remodeling In Endurance Athletes

Found this really interesting.

I found the comment interesting about if the chamber size gets too big for the thickness of the walls, then the heart can struggle to eject the blood.

Would this be something that might occur if you do a sustained high volume of low intensity exercise with little or no high intensity? In other words a minimum amount of high intensity needs to be done in proportion to the volume of low intensity to keep the chamber size and wall thickness of the heart in healthy proportion?

My other question is whether atrial fibrillation in endurance athletes is associated with large volumes of high intensity , or just large volumes of exercise regardless of intensity, or that there’s no association detected yet?

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Found this study which answers many of my questions