title: The feasibility and acceptability of questionnaires and accelerometry for measuring physical activity and sedentary behaviour in adults with mental illness.
abstract: BACKGROUND
  Adults with mental illness may have difficulties with data collection methods such as questionnaires and accelerometry.
  
  
  OBJECTIVE
  To assess the utility of questionnaires and accelerometry for assessing physical activity (PA) and sedentary behaviour (SB) in non-institutionalised adults with mental illness.
  
  
  METHODS
  Participants were recruited from outpatient clinics and community organisations. Participants completed PA and SB questionnaires, wore accelerometers for 7 d, and rated the ease/difficulty of completing study components. Recruitment numbers, adherence, and ease/difficulty ratings were examined. Ease/difficulty ratings were compared between study components, and between participants by distress level.
  
  
  RESULTS
  One hundred forty-two participants completed the questionnaires; they found it easier to report PA than reclining time (p = 0.017), and reclining time than sitting time (p < 0.001). Participants with high distress found it more difficult to report sitting time and PA than participants with low distress (p < 0.017). Ninety-nine participants (70%) completed the accelerometry; the majority (88%) met the minimum wear-time criteria. They found it easier to wear the monitor during the day than while sleeping (p < 0.001), and easier to complete accelerometry than questionnaires (p < 0.001).
  
  
  CONCLUSIONS
  Accelerometry was more feasible for assessing SB than questionnaires. Questionnaires were feasible for assessing PA, but less acceptable for people experiencing high distress.
authors.affiliation: a School of Human Movement and Nutrition Studies, The University of Queensland , Brisbane , Australia.
authors.forename: Justin J
authors.initials: JJ
authors.lastname: Chapman
authors.affiliation: a School of Human Movement and Nutrition Studies, The University of Queensland , Brisbane , Australia.
authors.forename: Sarah J
authors.initials: SJ
authors.lastname: Fraser
authors.affiliation: a School of Human Movement and Nutrition Studies, The University of Queensland , Brisbane , Australia.
authors.forename: Wendy J
authors.initials: WJ
authors.lastname: Brown
authors.affiliation: a School of Human Movement and Nutrition Studies, The University of Queensland , Brisbane , Australia.
authors.forename: Nicola W
authors.initials: NW
authors.lastname: Burton
mesh_terms: D061725:Accelerometry / Q000706:statistics & numerical data*; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000503:physiopathology / Q000523:psychology*; D008875:Middle Aged; D009043:Motor Activity; D057185:Sedentary Behavior; D011795:Surveys and Questionnaires / Q000706:statistics & numerical data*
keywords: Accelerometer; mental illness; physical activity; sedentary behaviour