ECG changes in athletes

Hello BBM and community,
Just listened to the extreme exercise podcast, great content. Thanks for putting it together!
I was hoping to learn a bit about ECG changes in athletes, extreme and non-extreme.
Would you have any references for this?
I searched but could only find somewhat superficial coverage on PR intervals for example, and nothing related to health outcomes.
Best wishes,
Antonio

Searching “electrocardiographic findings in athletes” turns up numerous resources on the topic.

For example:

Thanks, and apologies, I phrased my question pretty poorly. This will do though, sorry for the wasted time!