title: The effect of driven exercise on treatment outcomes for adolescents with anorexia and bulimia nervosa.
abstract: OBJECTIVE
  This study investigated the prevalence of driven exercise (DE) and its role in treatment outcome for adolescents with bulimia nervosa (BN) and anorexia nervosa (AN).
  
  
  METHODS
  Participants were 201 adolescents with an eating disorder (ED) (80 with BN and 121 with AN) presenting for outpatient treatment at two specialist clinics. All adolescents participated in one of two randomized controlled trials. Descriptive statistics were conducted to evaluate the presence and frequency of baseline DE. Exploratory hierarchical regressions were used to evaluate the effect of baseline DE on treatment outcomes.
  
  
  RESULTS
  About 66.3% of adolescents with BN and 23.1% of adolescents with AN presented with baseline DE. The presence of baseline DE predicted significantly worse outcomes for adolescents with AN in terms of ED symptom severity (ps < .004); however, baseline DE did not significantly predict any of the evaluated outcomes for adolescents with BN (ps < .05).
  
  
  CONCLUSIONS
  The results of this secondary exploratory data suggest that DE is prevalent for adolescents with BN and AN. However, DE may be related to different constructs for adolescents with AN than those with BN, suggesting differences in treatment needs.
authors.affiliation: Center for Behavioral Intervention Technologies and Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois; Department of Psychiatry and Behavioral Neuroscience, The University of Chicago, Chicago, Illinois.
authors.forename: Colleen
authors.initials: C
authors.lastname: Stiles-Shields
authors.forename: Bryony Bamford
authors.initials: BB
authors.lastname: DclinPsy
authors.forename: James
authors.initials: J
authors.lastname: Lock
authors.forename: Daniel
authors.initials: D
authors.lastname: Le Grange
mesh_terms: D000293:Adolescent; D000553:Ambulatory Care; D000856:Anorexia Nervosa / Q000628:therapy*; D052018:Bulimia Nervosa / Q000628:therapy*; D002648:Child; D004328:Drive; D005081:Exercise Therapy / Q000379:methods* / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D012044:Regression Analysis; D016896:Treatment Outcome
keywords: adolescents; anorexia nervosa; bulimia nervosa; driven exercise; eating disorder; treatment outcome