Heart rate variability at the onset of efferent vagal stimulations in the rabbit.
Vagal stimulations were performed in 6 anesthetized rabbits for single cardiac cycles. The distribution of effects over 6 consecutive cardiac cycles was described as a function of varying intervals between P waves and stimuli (P-St): the response on the first couple of cycles is affected by P-St whilst the effects decline regularly over successive cycles. Stimulation of 6 consecutive cycles showed rapid rise and subsequent slow increment of the response. Results interpreted as evidence for intracellular accumulation of a restraining factor for heart rate due to vagal stimulation.
D000818:Animals; D004525:Efferent Pathways / Q000502:physiology; D004558:Electric Stimulation; D006339:Heart Rate; D011817:Rabbits; D014630:Vagus Nerve / Q000502:physiology*