Inclusion Criteria:  Men or women aged 18 years and older,  patients with confirmed ARVC, but with no major RV dysfunction (RVEF >40%) endurance athletes with dilated RV endurance athletes with non-dilated RV untrained healthy subjects with non-dilated RV who signed a written free and informed consent:  Exclusion Criteria:  Patients with other cardiovascular disease; Contra-indication to CMR (in particular presence of a non-CMR compatible implantable cardiac defibrillator); Patients with permanent supraventricular arrhythmia; Patients unable to perform an exercise test on an ergocycle; Person subject to legal protection (safeguard justice, trusteeship and guardianship) and persons deprived of liberty