title: Psychometric Properties of the Iranian Version of the Behavioral Regulation in Exercise Questionnaire-2 (BREQ-2).
abstract: BACKGROUND
  The Behavioral Regulation in Exercise Questionnaire (BREQ) and the BREQ-2 are the most commonly used measures of behavioural regulation in exercise psychology. The purpose of the study was to assess the validity and reliability of the Iranian version of the BREQ-2 on a sample of university students.
  
  
  METHODS
  The BREQ-2 was translated into Persian by qualified experts and the psychometric properties of the instrument were assessed. Content validity was established, using a panel of 12 Iranian experts in the areas of health education, psychology, and exercise. Construct validity was assessed via confirmatory factor analysis (CFA), using LISREL 8.80 (N = 418). The reliability of the BREQ-2 was assessed, using a 2-week test-retest to establish its stability and Cronbach's Alpha to estimate its internal consistency.
  
  
  RESULTS
  The Iranian version of the BREQ-2 was slightly modified to improve content validity. Primary results of confirmatory factor analysis did not fully support the 5-factor uncorrelated model. The model was modified; and the fit indices indicated that the 5-factor correlated model was the best fit. The scale was found to have acceptable internal consistency (α > 0.7) and test-retest reliability (intra-class correlation coefficient [ICC] > 0.80).
  
  
  CONCLUSIONS
  The Iranian BREQ-2 has acceptable validity and reliability in the study sample and may be used in relevant studies to assess behavioural regulation in similar samples.
authors.affiliation: Department of Health Education, Guilan University of Medical Sciences, Rasht, Iran.
authors.forename: Rabiollah
authors.initials: R
authors.lastname: Farmanbar
authors.affiliation: Department of Health Educations, Tarbiat Modares University, Tehran, Iran.
authors.forename: Shamsaddin
authors.initials: S
authors.lastname: Niknami
authors.affiliation: Department of Health Educations, Tarbiat Modares University, Tehran, Iran.
authors.forename: Alireza
authors.initials: A
authors.lastname: Hidarnia
authors.affiliation: School of Education, University of Newcastle, Newcastle, Australia.
authors.forename: David Revalds
authors.initials: DR
authors.lastname: Lubans
keywords: BREQ; Exercise; Self-Determination Theory; Students; Validity, reliability