Approximately half or more of marathon runners may have elevated troponin levels post-race due to overstretching of the heart's atria and right ventricle.

“a lot of people i mean upwards of half or more people after a marathon will have on the elevated troponin it's just the vest at that high level 25 30 liters a minute for two and a half three four hours it starts overstretching the muscles in the atria and the right ventricle particularly and it leaks into the bloodstream”