title: [Physiological significances in rhythmic variations of heart period and its clinical application (author's transl)].
mesh_terms: D000818:Animals; D001146:Arrhythmia, Sinus / Q000503:physiopathology; D002415:Cats; D004562:Electrocardiography; D006339:Heart Rate; D006801:Humans; D012119:Respiration