title: Cardiac autonomic function and cardiovascular response to exercise in patients with chronic obstructive pulmonary disease.
abstract: BACKGROUND
  Chronic obstructive pulmonary disease (COPD) is associated with impaired exercise tolerance, but it has not been established to what extent cardiac autonomic function impacts on exercise capacity.
  
  
  OBJECTIVE
  To evaluate whether there is an association between airflow limitation and cardiac autonomic function and whether cardiac autonomic function plays a role in exercise intolerance and daily physical activity (PA) in patients with COPD.
  
  
  METHODS
  Univariate and multivariate analyses were performed to evaluate the association between both 6-minute walking test (6MWT) and PA (steps per day) and pulmonary function, cardiac autonomic function (HR at rest, HRR and heart rate variability, HRV) in patients with COPD.
  
  
  RESULTS
  In 154 COPD patients (87 females, mean [SD]: age 62.5 [10.7] years, FEV(1) %predicted (43.0 [19.2]%), mean HR at rest was elevated (86.4 [16.4] beats/min) and HRV was reduced (33.69 [28.96] ms) compared to published control data. There was a significant correlation between FEV(1) and HR at rest (r = -0.32, p < 0.001), between HR at rest and 6MWD (r = -0.26, p = 0.001) and between HR at rest and PA (r = -0.29, p = 0.010). No correlation was found between HRV and 6MWD (r = 0.089, p = 0.262) and PA (r = 0.075, p = 0.322). In multivariate analysis both HR and FEV(1) were independent predictors of exercise capacity in patients with COPD.
  
  
  CONCLUSIONS
  In patients with COPD the degree of airflow limitation is associated with HR at rest. The degree of airflow limitation and cardiac autonomic function, as quantified by HR at rest, are independently associated with exercise capacity in patients with COPD.
authors.affiliation: Department of Pneumology, University Hospital Ruhrlandklinik, Essen, Germany. vrns@zhaw.ch
authors.forename: Arnoldus J R
authors.initials: AJ
authors.lastname: van Gestel
authors.forename: Malcolm
authors.initials: M
authors.lastname: Kohler
authors.forename: Jörg
authors.initials: J
authors.lastname: Steier
authors.forename: Urte
authors.initials: U
authors.lastname: Sommerwerck
authors.forename: Sebastian
authors.initials: S
authors.lastname: Teschler
authors.forename: Erich W
authors.initials: EW
authors.lastname: Russi
authors.forename: Helmut
authors.initials: H
authors.lastname: Teschler
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D001337:Autonomic Agents; D001341:Autonomic Nervous System / Q000503:physiopathology*; D003430:Cross-Sectional Studies; D005080:Exercise Test; D017079:Exercise Tolerance / Q000502:physiology*; D005260:Female; D005541:Forced Expiratory Volume; D006321:Heart / Q000294:innervation*; D006334:Heart Function Tests; D006801:Humans; D008168:Lung / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology*; D012123:Pulmonary Ventilation / Q000502:physiology*; D012044:Regression Analysis; D013147:Spirometry; D016138:Walking
chemical_list: D001337:Autonomic Agents