Ventricular Arrhythmia After Myocarditis in Sportsman

Inclusion Criteria: * acute myocarditis, diagnosed on the association of (a) recent viral infection (upper airway, gastro-intestinal) , (b) troponin increase, and (c) chest pain AND myocarditis confirmed by cardiac magnetic resonance 2 out of 3 Lake Louise criteria, either T2 hypersignal, early enhancement or late gadolinium enhancement. * regular physical activity, recreational or competitive: \>=4 hours weekly * written informed consent Exclusion Criteria: * coronary artery disease * acute inflammatory cardiomyopathy (sarcoidosis, fulminant myocarditis, Tako Tsubo, eosinophilic myocarditis, Lyme disease) * history of myocarditis * contra-indication to cardiac MRI * patient unable to perform a treadmill stress test