LAUSR

BACKGROUND Physical activity is strongly associated with lower risk of recurrent cardiac events in patients who experience an acute coronary syndrome (ACS), yet most patients do not meet recommended levels of physical activity. Psychological well-being is associated with higher levels of physical activity, but midlife adults experience a multitude of stressors that can reduce well-being. OBJECTIVE The aim of this study was to compare midlife (age 45-64) and older (age 65+) participants in a positive psychology intervention to increase physical activity and psychological well-being after an ACS. METHODS This was a secondary analysis across 3 phases of a telephone-delivered positive psychology intervention development project. Participants were hospitalized for an ACS and had low pre-ACS health behavior adherence. They received 8-12 weekly intervention sessions. Psychological outcomes, self-reported adherence, and physical activity were measured before and after treatment. Mixed regression models were used to compare session completion rates and change in outcome measures between midlife and older participants. RESULTS Across 164 participants, midlife participants showed larger improvements in depression, positive affect, and physical activity, but not anxiety or optimism, than older participants; session completion rates did not significantly differ. CONCLUSIONS Midlife patients post-ACS may be particularly responsive to a telephone-delivered positive psychology intervention. Clinically, the post-ACS period may be uniquely motivating for midlife patients to improve their physical and psychological health. Future work could customize positive psychology for unique midlife stressors.