Originally Posted by
Otterbox
Your level of fitness activity may be the catalyst for the murmur.
This too. Serious endurance athletes often have a "rough idle" resting heart rate. The military docs would have us do push ups before the EKG to get above idle. I still do that for FAA KEGs. Except last year... sure enough, got some weird results.
Not sure if the OP runs enough for that to be an issue.