Cardiography, ImpedanceElectric ImpedancePlethysmography, ImpedanceCardiac OutputIsosorbideThoracic CavityHeart AuscultationHeart SoundsStroke VolumeHemodynamicsKinetocardiographyPhonocardiographyDielectric SpectroscopyVascular ResistanceHeart RateMonitoring, PhysiologicBlood PressureReproducibility of ResultsHeart FailureExerciseElectrocardiography