title: Evaluation of a standard provision versus an autonomy promotive exercise referral programme: rationale and study design.
abstract: BACKGROUND
  The National Institute of Clinical Excellence in the UK has recommended that the effectiveness of ongoing exercise referral schemes to promote physical activity should be examined in research trials. Recent empirical evidence in health care and physical activity promotion contexts provides a foundation for testing the utility of a Self Determination Theory (SDT)-based exercise referral consultation.
  
  
  METHODS
  
  
  
  METHODS
  An exploratory cluster randomised controlled trial comparing standard provision exercise on prescription with a Self Determination Theory-based (SDT) exercise on prescription intervention.
  
  
  METHODS
  347 people referred to the Birmingham Exercise on Prescription scheme between November 2007 and July 2008. The 13 exercise on prescription sites in Birmingham were randomised to current practice (n = 7) or to the SDT-based intervention (n = 6).Outcomes measured at 3 and 6-months: Minutes of moderate or vigorous physical activity per week assessed using the 7-day Physical Activity Recall; physical health: blood pressure and weight; health status measured using the Dartmouth CO-OP charts; anxiety and depression measured by the Hospital Anxiety and Depression Scale and vitality measured by the subjective vitality score; motivation and processes of change: perceptions of autonomy support from the advisor, satisfaction of the needs for competence, autonomy, and relatedness via physical activity, and motivational regulations for exercise.
  
  
  CONCLUSIONS
  This trial will determine whether an exercise referral programme based on Self Determination Theory increases physical activity and other health outcomes compared to a standard programme and will test the underlying SDT-based process model (perceived autonomy support, need satisfaction, motivation regulations, outcomes) via structural equation modelling.
  
  
  BACKGROUND
  The trial is registered as Current Controlled trials ISRCTN07682833.
authors.affiliation: School of Health & Population Sciences, University of Birmingham, Birmingham, UK. c.b.jolly@bham.ac.uk
authors.forename: Kate
authors.initials: K
authors.lastname: Jolly
authors.forename: Joan L
authors.initials: JL
authors.lastname: Duda
authors.forename: Amanda
authors.initials: A
authors.lastname: Daley
authors.forename: Frank F
authors.initials: FF
authors.lastname: Eves
authors.forename: Nanette
authors.initials: N
authors.lastname: Mutrie
authors.forename: Nikos
authors.initials: N
authors.lastname: Ntoumanis
authors.forename: Peter C
authors.initials: PC
authors.lastname: Rouse
authors.forename: Rekha
authors.initials: R
authors.lastname: Lodhia
authors.forename: Geoffrey C
authors.initials: GC
authors.lastname: Williams
mesh_terms: D001794:Blood Pressure; D015992:Body Mass Index; D005081:Exercise Therapy / Q000379:methods*; D015438:Health Behavior; D006293:Health Promotion / Q000379:methods*; D006304:Health Status; D006801:Humans; D009043:Motor Activity; D026684:Personal Autonomy; D055656:Prescriptions; D012017:Referral and Consultation; D012944:Social Support; D006113:United Kingdom