title: Exploring the construct validity of the transtheoretical model to structure physical activity interventions for individuals with serious mental illness.
abstract: OBJECTIVE
  Physical activity intervention research involving individuals with serious mental illness are often not based on any theoretical framework. This study examined the construct validity of the Transtheoretical Model (TTM) in individuals with serious mental illness to guide future physical activity interventions.
  
  
  METHODS
  Fifty-four individuals completed surveys that asked about their current stage of change for physical activity, self-efficacy, and perceived advantages and disadvantages of being more physically active.
  
  
  RESULTS
  Most individuals reported being in the preparation stage of the TTM. As individuals approached the action and maintenance stages, self-efficacy and perceived benefits of physical activity increased significantly. Although perceived disadvantages decreased with each successive stage, this change was not significant.
  
  
  CONCLUSIONS
  This study's findings support the TTM's application in this population to structure physical activity interventions given that self-efficacy, perceived benefits of and barriers to physical activity differed across stages and changes were in the direction predicted by theory.
authors.affiliation: Faculty of Physical Education and Health.
authors.forename: Paul
authors.identifier: 0000-0001-8876-8935
authors.initials: P
authors.lastname: Gorczynski
authors.affiliation: Faculty of Physical Education and Health.
authors.forename: Guy
authors.identifier: 0000-0001-8898-2536
authors.initials: G
authors.lastname: Faulkner
authors.affiliation: Department of Anatomy and Cell Biology.
authors.forename: Steven
authors.initials: S
authors.lastname: Greening
authors.affiliation: Centre for Addiction and Mental Health.
authors.forename: Tony
authors.initials: T
authors.lastname: Cohn
mesh_terms: D000328:Adult; D000368:Aged; D001294:Attitude to Health; D001835:Body Weight; D019090:Case Management; D015444:Exercise / Q000523:psychology*; D005260:Female; D015438:Health Behavior; D006801:Humans; D007389:Internal-External Control; D008297:Male; D008875:Middle Aged; D008960:Models, Psychological; D009042:Motivation; D009043:Motor Activity; D010044:Outpatient Clinics, Hospital; D011618:Psychotic Disorders / Q000523:psychology / Q000534:rehabilitation*; D020377:Self Efficacy; D055815:Young Adult