The hard training that elite athletes and elite exercisers perform involves strain on the heart.

Today, there are guidelines in elite sports for how to control your heart, but for elite exercisers it is lacking.

- If you play sports at a high level, you have to know if the heart tolerates it or not, says Peder Sörensson.

Karolinska's new specialist clinic wants to be a Swedish center for heart problems linked to sports.