@article {Coultas3489, author = {David Coultas and Rennie Russo and Jennifer Peoples and Jamile Ashmore and John Sloan and Bradford Jackson and Minyong Uhm and Karan Singh and Sejong Bae}, title = {Improvements in self-efficacy and readiness to engage in physical activity are associated with improved health outcomes among patients with COPD}, volume = {44}, number = {Suppl 58}, elocation-id = {3489}, year = {2014}, publisher = {European Respiratory Society}, abstract = {Rationale: Little is known about the effectiveness of interventions to increase physical activity (PA) among patients with COPD. The purpose of this investigation was to examine relationships between psychological determinants of PA and health outcomes.Methods: This was a randomized trial of a PA intervention (PAI) compared to usual care (UC). Primary outcomes at 6 months were Chronic Respiratory Questionnaire-dyspnea domain (ΔCRQD) and 6-minute walk distance (Δ6MWD). Minimal clinically important differences (MCID) were 0.5 and 25m, respectively. Psychological determinants included aggregate COPD self-efficacy scale (ACSES) for coping with and managing dyspnea and readiness to change PA (RCPA). McNemar{\textquoteright}s odds ratios for improvement vs. decline were estimated.Results: A total of 305 were randomized (156 UC, 149 I). At 6-months there were no differences in odds of ACSES change(Table). In contrast there were significant differences in odds of RCPA change (Table). Overall, there were no MCID for either CRQD or 6MWD (Table).View this table:In subgroup analyses, improvement in both ACSES and RCPA was associated with some of the largest improvements in outcomes: I-group (6MWD=45.8m, CRQD=0.6), UC (6MWD=18.2m, CRQD=0.5).Conclusion: These results suggest that inconsistent improvement in psychological determinants of PA may partly explain the lack of overall effectiveness of this intervention.}, issn = {0903-1936}, URL = {https://erj.ersjournals.com/content/44/Suppl_58/3489}, eprint = {https://erj.ersjournals.com/content}, journal = {European Respiratory Journal} }