“…Regrettably, a growing body of literature indicates that patients attending home-based CR programs do not adhere to their MVPA prescriptions. 2,3 Research in other CR contexts have attempted to explain MVPA levels via intrapersonal (e.g., self-efficacy) and interpersonal (e.g., social support) variables. 4 Although important, such studies Blanchard, Rainham, and McSweeney are with the Dalhousie University, Halifax, Nova Scotia, Canada; Spence is with the University of Alberta, Edmonton, Alberta, Canada; McDonnell, Reid, and Edwards are with the University of Ottawa, Ottawa, Ontario, Canada; Rhodes is with the University of Victoria, Victoria, British Columbia, Canada; McGannon is with the Laurentian University, Greater Sudbury, Ontario, Canada.…”