title: Correlates of physical activity in chronic obstructive pulmonary disease.
abstract: BACKGROUND
  Physical activity is a key dimension of functional status in people with chronic obstructive pulmonary disease (COPD), and the central target of interventions in this group.
  
  
  OBJECTIVE
  To determine the relationships among functional performance measured as physical activity, functional capacity, symptom experiences, and health-related quality of life in people with COPD.
  
  
  METHODS
  Cross-sectional, descriptive study. Convenience sample of 63 outpatients with COPD studied prior to entry into a pulmonary rehabilitation program.
  
  
  RESULTS
  Daily physical activity, as measured by an accelerometer, was strongly associated with maximal distance walked during a 6-minute walk test (r = .60, p < .00), level of airway obstruction (r = .37, p < .01), walking self-efficacy (r = .27, p < .05), and physical health status (r = .40, p < .01). Physical activity was not correlated with self-report of functional status. The only predictor of physical activity was the 6-minute walk test.
  
  
  CONCLUSIONS
  Accelerometer measurement of functional performance was most significantly related to walking abilities. This methodology represents a novel approach to measuring an important dimension of functional status not previously well quantified.
authors.affiliation: Biobehavioral Nursing and Health Systems, School of Nursing, University of Washington, Seattle 98195-7266, USA. basiab@uwashington.edu
authors.forename: B
authors.initials: B
authors.lastname: Belza
authors.forename: B G
authors.initials: BG
authors.lastname: Steele
authors.forename: J
authors.initials: J
authors.lastname: Hunziker
authors.forename: S
authors.initials: S
authors.lastname: Lakshminaryan
authors.forename: L
authors.initials: L
authors.lastname: Holt
authors.forename: D M
authors.initials: DM
authors.lastname: Buchner
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D004417:Dyspnea / Q000209:etiology; D015444:Exercise / Q000502:physiology* / Q000523:psychology*; D005080:Exercise Test; D005221:Fatigue / Q000209:etiology; D005260:Female; D005541:Forced Expiratory Volume; D006304:Health Status; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000150:complications / Q000503:physiopathology* / Q000523:psychology*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011237:Predictive Value of Tests; D011788:Quality of Life; D012044:Regression Analysis; D020377:Self Efficacy; D016138:Walking