title: Sleep-waking modulation of respiratory sinus arrhythmia in aged and young adult cats.
abstract: Heart rate variation at the respiratory frequency was examined in young adult and aged cats during waking and quiet sleep. Respiratory sinus arrhythmia was found to be significantly enhanced during quiet sleep compared with waking in both groups of cats. Aged cats exhibited respiratory sinus arrhythmia comparable to that of young adult cats during both waking and quiet sleep.
mesh_terms: D000367:Age Factors; D000818:Animals; D001146:Arrhythmia, Sinus / Q000503:physiopathology*; D002415:Cats; D012120:Respiration Disorders / Q000503:physiopathology*; D012890:Sleep / Q000502:physiology*; D014851:Wakefulness / Q000502:physiology*