Behavioral activation for depressed breast cancer patients: the impact of therapeutic compliance and quantity of activities completed on symptom reduction.

OBJECTIVE: Behavioral activation (BA) is an empirically validated treatment that reduces depression by increasing overt behaviors and exposure to reinforcing environmental contingencies. Although research has identified an inverse correlation between pleasant or rewarding activities and depression, the causal relation between increased structured activities and reduced depression has not directly been studied. METHOD: In the context of a recent randomized trial (Hopko, Armento, et al., 2011), this study used longitudinal data and growth curve modeling to examine relationships among the quantity of activities completed, proportion of activities completed (i.e., therapeutic compliance), environmental reward, and depression in breast cancer patients treated with BA treatment for depression (n = 23). RESULTS: Therapeutic compliance with assigned activities was causally related to depression reduction, whereas the specific quantity of completed activities was not systematically related. Logistic regression indicated that for patients completing all assigned activities, treatment response and remission were achieved for all patients. Neither therapeutic compliance nor the quantity of completed activities was directly associated with self-reported environmental reward during the BA interval (Session 3 to posttreatment), and environmental reward did not mediate the relation between activation and depression. CONCLUSIONS: Patient compliance with BA assignments is causally associated with depression reduction, whereas the quantity of completed activities is less relevant toward conceptualizing positive treatment outcome. Study findings are discussed in the context of behavioral models of depression and BA therapy.