Abstract P424: Determinants of Objectively Measured Physical Activity in Patients Entering a Phase III Cardiac Rehabilitation Program
Introduction: Despite well-known benefits of physical activity (PA) on long-term health in cardiac patients, many cardiac patients remain inactive. In order to develop effective interventions to promote moderate-to-vigorous physical activity (MVPA), factors influencing participation in PA in cardiac patients need to be identified. However, few studies have examined determinants of PA in this patient population. Therefore, the purpose of this study was to identify determinants of objectively measured PA in patients entering maintenance phase cardiac rehabilitation program (CRP).
Hypothesis: We examined the hypothesis that the amount of cardiac patients’ time spent in PA is influenced by multiple factors.
Methods: Subjects were 65 cardiac patients (74% male, 95% white), age 58.6 ± 10.6 years, entering phase III CRP. The amount of time spent in PA was measured by ActiGraph accelerometers for 7 days prior to joining CRP (total PA cutpoints; >100 counts/min, MVPA cutpoints; ≥1952 counts/min). A total of 24 potential determinants of PA across multiple domains (demographic, clinical, psychosocial, and behavioral) were measured via self-reported questionnaire and clinical examinations. Backward elimination model selection procedures were performed to examine associations of potential determinants with total PA (min/d) and MVPA (min/d).
Results: At entry to CRP, patients spent 154 ± 63 min/d and 8 ± 8 min/d in total PA and MVPA, respectively. In the final model, functional capacity, PA readiness, and participation in regular exercise were positively associated with MVPA (R2 =26.6%). Functional capacity and PA readiness were also positively associated with total PA (R2 = 15.9%).
Conclusion: Several behavioral, clinical, and psychosocial factors were found to be determinants of objectively-measured PA in patients entering maintenance CRP. Considering low levels of PA in cardiac patients, maintenance CRP should consider determinants identified in this study as its key components to promote PA outside of CRP.
- © 2013 by American Heart Association, Inc.