Doherty Center for Aviation and Health Research

Faculty Funded Work

Daily Physical Activity after Cardiac Resynchronization Therapy: A Randomized Trial

Daisy Sherry, PhD, CNP, RN


There is an ever-growing number of heart failure patients receiving cardiac resynchronization therapy (CRT) device implantation as a treatment for heart failure. Though benefits of CRT include improved physical function, there is limited knowledge about whether this translates to improved daily physical activity. Additionally, the best way to promote regular daily physical activity is debated. The use of tailored health interventions such as motivational interviewing with targeted health behavior such as physical activity has been demonstrated successful in various chronically ill populations. However, the effect on CRT patients is unknown. The purpose of this pilot study is to estimate effect size and evaluate feasibility to inform future research that includes a larger-scale randomized controlled trial. The study design is a prospective, interventional, randomized, and controlled trial. Subjects recruited from two Midwestern hospitals will be randomly assigned to an Intervention Group with motivational interview, or a Control Group with usual care. Primary study variables are physical activity, physical function, and health-related quality of life. Measures include pedometry, accelerometry (CRT-based), Activity Log self-report, Patient Reported Outcomes Measurement Information System (PROMIS) v.1.1 Global Health survey, and PROMIS 43 Profile v1.0. Randomization and data analysis will be performed using Excel and/or SPSS. Analysis will include descriptive statistics, scatterplots, t-tests, correlations, and ANOVA. Post-hoc analysis of power will be performed to estimate effect size.