I too have a "heart condition" based on endurance exercise albeit only after 10 years. It was diagnosed a few years back when training for a sub-2:45 marathon as an inverted t-wave on an ECG. I had it checked with an echocardiogram as it could be 1 of 5 things apparently:
1. faulty equipment (need a new ECG machine) 2. blocked artery in the heart (require a stent or bypass) 3. Left ventricular hypertrophy (pos. require a heart transplant, at a minimum stop exercise) 4. Cardio myopathy (requires heart transplant)
5. Endurance athlete where the muscle is enlarged to cope with the additional stresses placed on it.
Oddly it was number 5. As an aside whilst waiting for the formal diagnosis I though sod it and raced thinking it might be my last and ended up winning!
My view based on this experience is that athletes are not the general population and comparing the two groups doesn't actually help
Some good running out therer and the summer has really brought the speed out in everyone. What a week it has been here too, first of gave parkrun a bash for the first time in a year and ran 17:09 for 2nd (started too fast) but given the congestion in the last lap I'm v. happy only 4s down on my best for the course. Then some running along the Danube in Vienna, very nice before heading to the Yorkshire Dales for some quality hills, which on Saturday involved a fell race, which I WON!!!! picking up the trophy it has both Brownlee brothers names are on there from previous years. Then my 9yo daughter went and came 2nd in the junior fell race (8-15's) beating some county runners, Mike she is signed-up for Kennet on a Friday. Needless to say the 15M hilly run Sunday was a struggle!