Initial studies have suggested that a cardiac rehabilitation program (CRP) may improve the physical and psychological functioning of participants. However, these studies have generally addressed a relatively young group of employed adult males. Three studies were designed to target an older, generally retired Veterans Administration population for rehabilitation of both their physical functioning and for modifying risk factors associated with continuing or recurrent cardiovascular difficulties. Chart review of 44 males who completed the CRP indicated that intervention produced significant positive changes in oxygen consumption, energy expenditure, and functional classification. Study 2 was a replication and extension of the first study and also indicated signficant improvement in oxygen consumption, functional classification, energy expenditure, and lipid values. Study 3 showed that completion of the program resulted in greater understanding of heart disease, and satisfaction with physical and emotional functioning. The studies support the role of a part-time CRP as an effective agent of change for the Veterans Administration population. (Author)