Andrew Maiorana1, Nikos Ntoumanis2. 1. School of Physiotherapy and Exercise Science, Curtin University, Perth, WA, Australia; Allied Health Department and Advanced Heart Failure and Cardiac Transplant Service, Fiona Stanley Hospital, Perth, WA, Australia. Electronic address: A.Maiorana@curtin.edu.au. 2. Health Psychology and Behavioural Medicine Research Group, School of Psychology and Speech Pathology, Curtin University, Perth, WA, Australia.