title: [Special characteristics of chronotropic reaction to physical exercise in patients with systolic heart failure and obstructive sleep apnea syndrome].
abstract: In order to study special characteristics of chronotropic reaction to physical exercise on veloergometer in the presence of obstructive sleep apnea (OSA) we examined 84 patients with manifestations of chronic systolic heart failure (HF). Chronotropic insufficiency was found in 88% of patients predominantly in combination with insufficient lowering of heart rate after exercise. At the same time it was more rarely registered in patients with OSA (56.4%). Insufficient lowering of heart rate by the end of first minute of rest was similarly associated with HF and OSA.
  
  
  CONCLUSIONS
  it is necessary to consider simultaneously chronotropic reserve and character of HR recovery after exercise.
authors.forename: A P
authors.initials: AP
authors.lastname: Ivanov
authors.forename: I A
authors.initials: IA
authors.lastname: Él'gardt
authors.forename: V V
authors.initials: VV
authors.lastname: Rostorotskaia
mesh_terms: D000368:Aged; D002908:Chronic Disease; D004452:Echocardiography; D005080:Exercise Test; D017079:Exercise Tolerance; D005260:Female; D054143:Heart Failure, Systolic / Q000175:diagnosis / Q000378:metabolism / Q000503:physiopathology*; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D020097:Natriuretic Peptide, Brain / Q000097:blood; D010446:Peptide Fragments / Q000097:blood; D010809:Physical Fitness; D012307:Risk Factors; D012720:Severity of Illness Index; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis / Q000378:metabolism / Q000503:physiopathology*
chemical_list: D010446:Peptide Fragments; C109794:pro-brain natriuretic peptide (1-76); D020097:Natriuretic Peptide, Brain