 Measurements Five days of continuous electrocardiography ECG will be recorded with ePatch BioTelemetry Technology ApS, Denmark. The apparatus has a build-in inclinometer, accelerometer and the opportunity to mark the initiation of an event; in this case physical exercise, and is able to monitor heart rate continuously for five days at a sample rate of 256 Hz. The Epatch is attached to the patients skin, over their sternum, using an adhesive patch. It can withstand most daily activities and is splash resistant. If medical imaging is necessary the ePatch will be removed and replaced afterwards. 