Is athletes heart causing my palpitations during exercise? Resting hr 50, clear echo and 24hr holter. I do lots of endurance training.

Pvcs, . Endurance runners can have skipped beats and irregular heart beat such as atrial Fibrilation during or at the end of an exercise bout . They do not usually have any clinical significance except if the runner has a lot of symptoms or interfere with overall performance. .
Yes. if echo and holter are normal,continue your regular f-up with your physician.