The purpose of this study was to explore the predictive and discriminative ability of hostility, coping, perceived social support and self-efficacy on different patterns of adherence to the cardiac rehabilitation program (CRP) of 112 myocardial infarction (MI) survivor patients, evaluated with Aggression Questionnaire (Buss and Perry, 1992), Coping Strategies Questionnaire (Rodríguez-Marín et al, 1992); Social Support Scale (Dunn et al, 1978), and Self-efficacy for Weight Control Inventory (Román et al, 2007). Variables problem-focused C, PSS and SE, grouped in discriminant function 1, were significant (p= 0.000) for discriminating groups; while the variables hostility and emotional coping, grouped in discriminant function 2, were not significant (p= 0.155) to explain the difference between the groups. The variables of perceived social support, problem-focused coping and self-efficacy for weight control differentiate people who start the CRP, suggesting the importance of considering these variables on the rehabilitation of patients who have had an MI.