Experiments were performed to evaluate whether the negative inotropic effect of efferent vagal stimulation is more strictly related to the number of stimuli falling with each cardiac cycle (St/c) or to the number of stimuli per second (St/s). Therefore, vagal stimulations were performed in anaesthetized dogs either with constant frequency (CONT), or with trains of 3 stimuli triggered by each atrial activation (SYNCHR). An atrial contractility index was measured while increasing heart rate by artificial heart pacing during CONT and SYNCHR vagal stimulations. The negative inotropic parasympathetic effect was reduced in the former protocol (St/s constant, St/c reduced) and did not change in the latter. It was concluded that the effect of vagal stimulation is more strictly related to St/c rather than to St/s. We suggest that the heart cycle operates as a biological clock with respect to cardiac vagal control.
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