Note this Italian study:
"... Since 1981, Italian authorities have run heart checks on all competing athletes. The incidence of sudden, fatal heart attacks has dropped from four cases per 100,000 to 0.4 cases per 100,000.
Without testing, athletes genetically predisposed to having an irregular heartbeat might not be aware of their condition until it's too late, doctors said. Adrenaline produced during exercise may overstimulate the heart, causing it to essentially short-circuit.
"Sport acts as a trigger," Corrado said in research presented at the meeting. ..." [Link]The scary photo came form more research I did on the potential for sudden death during sports. If you are an athlete, or going to become one, it is very important to get an EKG: [Link]