Abstract

Objective: This study examined whether within-person changes of breast cancer survivors’ high-arousal negative affect (e.g., feeling scared, upset, anxious, or guilty) could predict high levels of diurnal cortisol secretion and moderate-to-vigorous physical activity (MVPA). In addition, goal adjustment capacities (goal disengagement and goal reengagement) were expected to buffer the effect of negative affect on cortisol and to increase its effect on MVPA. Methods: High-arousal negative affect, self-reported MVPA, area-under-the-curve of diurnal cortisol secretion, and goal adjustment capacities were assessed in a longitudinal sample of 145 female breast cancer survivors. Results: Based on hierarchical linear modeling, breast cancer survivors reported increased levels of both MVPA and cortisol secretion if they experienced higher (as compared to lower) levels of high-arousal negative affect than their personal average. Furthermore, within-person negative affect was associated with: (i) higher MVPA among participants with high (but not low) goal reengagement capacities, and (ii) elevated cortisol secretion among participants with low (but not high) goal reengagement capacities. Conclusions: High-arousal negative affect may exert differing functions among breast cancer survivors in that it can trigger adaptive health behaviors, yet simultaneously elevate diurnal cortisol secretion. In addition, being able to engage in new goals may be a necessary condition for breast cancer survivors to experience the beneficial behavioral effects of high-arousal negative affect, and it may prevent the adverse effect of negative affect on enhanced cortisol output.