INTRODUCTION: Atrial fibrillation is one oft the most common arrythmia. A Resolution can be stroke or undersupply of organs. There are proved riskfactors and also during clinical days there is an accumulation for athelic people.Suggesting that people should be sportactive as much as possible for having a good or improved circulation of blood to protect atrial fibrillation, there are questions coming up why there is an accumulation in some sports.RELEVANT REFERENCES: There were an analyses of 33 studies regarding the relation of movement and atrial fibrillation.DISCUSSION: Prevalent, there were studies reasearching the consequences of high intensive training in endurance sports. There, the studie showes that people who do endurance sports have an higher risk to get atrial fibrillation. It seems that the requirement to get atrial fibrillation is a lifetime high intensive endurance workout with at least 1500 hours. Pathological, higher diamter appeared in hearts and also higher volume in the left atrium and ventricle. It seems that it appears only if there is an simultaneous presence of structural changes in preexisting athletes heart as a risk faktor. Also, inflammatorische prozesse can effect atrial fibrillation. Athelic people who have atrial fibrillation show an higher vagotonus with bradykardie and a longer PQ time. Even years after quitting massive sport there were still accumulation of atrial fibrillation.While there were signs life events like birth weight and genetic predisposition are risk faktors, the reduction of blood pressure or BMI dont effect atrial fibrillation.Contrary to high intensive training moderate movement reduces, especially in older people, the appearance of atrial fibrillation.Therapeutically there seem to be similar results in athletes and common people also in medical as in ablational therapy.