title: Effects of acute exercise on hemorheological, endothelial, and platelet markers in patients with chronic heart failure in sinus rhythm.
abstract: BACKGROUND
  Chronic heart failure (CHF) is associated with an increased risk of thrombosis and thromboembolic events, including stroke and venous thromboembolism. which may be related to a prothrombotic or hypercoagulable state. Acute vigorous exercise has been associated with activation of hemostasis, and this risk may well be particularly increased in patients with CHF.
  
  
  OBJECTIVE
  The study was undertaken to determine whether acute exercise would adversely affect abnormalities of hemorheological (fibrinogen, plasma viscosity, hematocrit), endothelial (von Willebrand factor), and platelet markers (soluble P selectin) in patients with CHF.
  
  
  METHODS
  We studied 22 ambulant outpatients (17 men; mean age 65+/-9 years) with stable CHF (New York Heart Association class II-III and a left ventricular ejection fraction of < or =40%) who were exercised to exhaustion on a treadmill. Results were compared with 20 hospital controls (patients with vascular disease, but free of CHF) and 20 healthy controls.
  
  
  RESULTS
  Baseline von Willebrand factor (p = 0.01) and soluble P-selectin (p = 0.006) levels were significantly elevated in patients with CHF when compared with controls. In the patients with CHF who were exercised, plasma viscosity, fibrinogen, and hematocrit levels increased significantly, both immediately post exercise and at 20 min into the recovery period (repeated measures analysis of variance, all p<0.05). There was a positive correlation between exercise workload and the maximal changes in plasma viscosity in the patients with CHF (Spearman r = 0.5, p = 0.02). Plasma viscosity levels increased with exercise in the hospital control group, although no other exercise-induced changes were noted in this group.
  
  
  CONCLUSIONS
  The present study indicates that the hemorheological indices. fibrinogen, and hematocrit specifically increase during acute exercise in patients with CHF. Although moderate exercise should be encouraged in patients with CHF, vigorous exercise should probably be avoided in view of its potential prothrombotic effects in this high-risk group of patients.
authors.affiliation: Haemostasis, Thrombosis, and Vascular Biology Unit, University Department of Medicine, City Hospital, Birmingham, United Kingdom.
authors.forename: C R
authors.initials: CR
authors.lastname: Gibbs
authors.forename: A D
authors.initials: AD
authors.lastname: Blann
authors.forename: E
authors.initials: E
authors.lastname: Edmunds
authors.forename: R D
authors.initials: RD
authors.lastname: Watson
authors.forename: G Y
authors.initials: GY
authors.lastname: Lip
mesh_terms: D000368:Aged; D000704:Analysis of Variance; D015415:Biomarkers / Q000097:blood; D001809:Blood Viscosity; D016022:Case-Control Studies; D015444:Exercise / Q000502:physiology*; D005260:Female; D005340:Fibrinogen; D006333:Heart Failure / Q000097:blood* / Q000503:physiopathology; D006400:Hematocrit; D018056:Hemorheology; D006801:Humans; D008297:Male; D008875:Middle Aged; D019007:P-Selectin / Q000097:blood; D018709:Statistics, Nonparametric; D013923:Thromboembolism / Q000097:blood* / Q000503:physiopathology; D014841:von Willebrand Factor / Q000032:analysis
chemical_list: D015415:Biomarkers; D019007:P-Selectin; D014841:von Willebrand Factor; D005340:Fibrinogen