Heart enlargement after competition or race simulation?

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Some time ago I read from one source on transient heart enlargement after long race or race simulation.
And this effect lasts 1-3 days.
But I cannot find this source again. Is here anybody who knows something on this subject?

 

[2LAP]

Try searching pubmed or searching for topics on cardiac fatigue and exercise.

 

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Thanks. I found opposite opinion that after too long competition (ironman) heart
reduces in size. I also read a lot on (ultra)marathons' impact on heart but
I'm curious what happened to heart after shorter events (less than 1 hr: TT, STXC and cyclocross races). Av. HR at these events much higher.