Marathon Running Not Linked to Lasting Cardiac Damage
medscape.comoriginal paper - https://jamanetwork.com/journals/jamacardiology/article-abst...
“Marathon running caused an acute, measurable drop in... function, but this was transient and did not translate into long-term... deterioration over 10 years in most recreational male runners... ”
... but also this https://news.ycombinator.com/item?id=46308646