title: Central origin vs. reflex feedback in the respiratory heart rate relationship.
abstract: In the midcollicular decerebrate cat we have observed unique respiratory variation in heart rate (respiratory-heart rate relationship, RHRR) in respiratory intervals of 2-7 s or Biot's breathing of paired breaths at 16-s intervals. Cardiac slowing that marked the respiratory segmentation of the heartbeat showed consistent relationship with the breath it preceded by 1 to 5 s. Thus, association of respiration and heartbeat must include synergistically central interrelated origins for respiration cardiac rates constituting the RHRR.
mesh_terms: D000818:Animals; D001698:Biomedical Engineering; D002415:Cats; D002490:Central Nervous System / Q000502:physiology; D003655:Decerebrate State / Q000503:physiopathology; D005246:Feedback; D006339:Heart Rate; D012018:Reflex / Q000502:physiology; D012119:Respiration