The heart as a biological clock: phase-locking between heart and efferent vagal activity.

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… (More)