Effects of the HEART Camp Trial on Adherence to Exercise in Patients with Heart Failure.

•The HEART Camp intervention significantly improved adherence to exercise at 12 and 18 months.•The intervention treatment effect did not differ based on patient's age, race, gender, marital status, type of heart failure (HF; preserved or reduced ejection fraction,) or NYHA functional class.•Left ventricular ejection fraction (LVEF) significantly moderated the treatment effect with greater adherence at higher LVEF.•Adherence levels remained modest, indicating a need for additional research to address methods and strategies to promote adherence to exercise in patients with HF.