The inter-relationship between sympathetic activity and the heart rate.
D000818:Animals; D001794:Blood Pressure; D002415:Cats; D004562:Electrocardiography; D004594:Electrophysiology; D006339:Heart Rate / Q000502:physiology*; D011311:Pressoreceptors / Q000502:physiology*; D013564:Sympathetic Nervous System / Q000502:physiology*