Dimensional analysis of emotion trajectories before and after disordered eating behaviors in a sample of women with bulimia nervosa.

There is an established relationship between increases in negative affect and engagement in binge eating and purging behaviors. Some evidence suggests that these behaviors may also be maintained via subsequent increases in positive affect. However, negative and positive affect are broad terms encompassing many emotions, and there is a theoretical speculation that every emotion consists of at least of three separate dimensions: valence, arousal, and approach/withdrawal. We conducted secondary analyses on a previously collected dataset using ecological momentary assessment in 133 women with bulimia nervosa. Participants rated their experience of discrete emotions and bulimic behaviors six times per day. Negative and positive emotions were organized within the 3-dimensional space characterized by valence, arousal, and approach/withdrawal. With multilevel modeling, we examined the trajectories of dimensionally defined emotion constructs prior and subsequent to bulimic behaviors as well as on days with and without bulimic behaviors. Negative valence, high arousal, and avoidance typified emotions that reached the highest levels before bulimic behaviors and were at the highest mean levels on days with bulimic behaviors. Arousal did not appear to moderate the trajectories of positive emotions. Application of a dimensional understanding of emotions may help elucidate the complex relationship between mood and disordered eating.