Dimensions of unhealthy exercise and their associations with restrictive eating and binge eating.

Unhealthy exercise is a core symptom of eating disorders that predicts greater chronicity and risk of relapse. A detailed conceptualization of unhealthy exercise in the context of eating disorders is only beginning to emerge, and associations between specific dimensions of unhealthy exercise and eating disorder symptoms have received little attention. The aim of the current study was to examine associations between three key dimensions of unhealthy exercise - compulsive exercise (i.e., rule-driven exercise to avoid negative affect), exercise to control weight/shape, and exercise to compensate for recent food intake - with restrictive eating and binge eating. Participants were 239 women drawn from two separate studies of emotions and eating behavior; 126 (52.7%) endorsed restrictive eating and/or objective binge eating episodes in the past three months. Unhealthy exercise dimensions were measured using the Compulsive Exercise Test and investigator-designed items, and eating disorder symptoms were assessed using the Eating Pathology Symptoms Inventory. Restrictive eating was only associated with avoidance and rule-driven exercise, whereas binge eating was significantly correlated with all unhealthy exercise variables. Multiple regression results revealed that only compensatory exercise was uniquely associated with binge eating. Unhealthy exercise consists of partially distinct dimensions with differential relations to core eating disorder symptoms. Future research should examine unhealthy exercise dimensions in patients with eating disorder diagnoses and consider whether treatments for specific unhealthy exercise forms might be beneficial.