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Arrhythmia incidence between trained and control groups measured by parallel registration of ECG and left ventricular pressure during Langendorff-perfusion. A representative section of ECG and pressure from control group indicate few extrasystoles in panel (a). In the trained group (panel b) the number of extrasystoles significantly increased. Panels (c–e) compares the extrasystole, bigeminy and salvo incidence between control and trained group, respectively.
