title: TaylorActive--Examining the effectiveness of web-based personally-tailored videos to increase physical activity: a randomised controlled trial protocol.
abstract: BACKGROUND
  Physical inactivity levels are unacceptably high and effective interventions that can increase physical activity in large populations at low cost are urgently needed. Web-based interventions that use computer-tailoring have shown to be effective, though people tend to 'skim' and 'scan' text on the Internet rather than thoroughly read it. The use of online videos is, however, popular and engaging. Therefore, the aim of this 3-group randomised controlled trial is to examine whether a web-based physical activity intervention that provides personally-tailored videos is more effective when compared with traditional personally-tailored text-based intervention and a control group.
  
  
  METHODS
  In total 510 Australians will be recruited through social media advertisements, e-mail and third party databases. Participants will be randomised to one of three groups: text-tailored, video-tailored, or control. All groups will gain access to the same web-based platform and a library containing brief physical activity articles. The text-tailored group will additionally have access to 8 sessions of personalised physical activity advice that is instantaneously generated based on responses to brief online surveys. The theory-based advice will be provided over a period of 3 months and address constructs such as self-efficacy, motivation, goal setting, intentions, social support, attitudes, barriers, outcome expectancies, relapse prevention and feedback on performance. Text-tailored participants will also be able to complete 7 action plans to help them plan what, when, where, who with, and how they will become more active. Participants in the video-tailored group will gain access to the same intervention content as those in the text-tailored group, however all sessions will be provided as personalised videos rather than text on a webpage. The control group will only gain access to the library with generic physical activity articles. The primary outcome is objectively measured physical activity. Secondary outcomes include website engagement and retention, quality of life, depression, anxiety, stress, sitting time, sleep and psychosocial correlates of physical activity. Outcomes will be measured at baseline, 3, and 9 months.
  
  
  CONCLUSIONS
  This study presents an ideal opportunity to study the effectiveness of an isolated feature within a web-based physical activity intervention and the knowledge generated from this study will help to increase intervention effectiveness.
  
  
  BACKGROUND
  Australian New-Zealand Clinical Trial Registry: ACTRN12615000057583 . Registered 22 January 2015. CQUniversity Ethics Project Number: H14/07-163.
authors.affiliation: Physical Activity Research Group, School of Human Health and Social Sciences, Central Queensland University, Rockhampton, Queensland, Australia. c.vandelanotte@cqu.edu.au.
authors.forename: C
authors.initials: C
authors.lastname: Vandelanotte
authors.affiliation: Freemasons Foundation Centre for Men's Health, South Australian Health and Medical Research Institute, Faculty of Health Sciences, The University of Adelaide, Adelaide, Australia. camille.short@adelaide.edu.au.
authors.forename: C
authors.initials: C
authors.lastname: Short
authors.affiliation: Priority Research Centre for Physical Activity and Nutrition, Faculty of Health and Medicine, School of Medicine & Public Health, The University of Newcastle, Callaghan, Australia. ron.plotnikoff@newcastle.edu.au.
authors.forename: R C
authors.initials: RC
authors.lastname: Plotnikoff
authors.affiliation: Physical Activity Research Group, School of Human Health and Social Sciences, Central Queensland University, Rockhampton, Queensland, Australia. c.hooker@cqu.edu.au.
authors.forename: C
authors.initials: C
authors.lastname: Hooker
authors.affiliation: Physical Activity Research Group, School of Human Health and Social Sciences, Central Queensland University, Rockhampton, Queensland, Australia. d.canoy@cqu.edu.au.
authors.forename: D
authors.initials: D
authors.lastname: Canoy
authors.affiliation: Physical Activity Research Group, School of Human Health and Social Sciences, Central Queensland University, Rockhampton, Queensland, Australia. a.rebar@cqu.edu.au.
authors.forename: A
authors.initials: A
authors.lastname: Rebar
authors.affiliation: Physical Activity Research Group, School of Human Health and Social Sciences, Central Queensland University, Rockhampton, Queensland, Australia. s.alley@cqu.edu.au.
authors.forename: S
authors.initials: S
authors.lastname: Alley
authors.affiliation: Physical Activity Research Group, School of Human Health and Social Sciences, Central Queensland University, Rockhampton, Queensland, Australia. s.schoeppe@cqu.edu.au.
authors.forename: S
authors.initials: S
authors.lastname: Schoeppe
authors.affiliation: Faculty of Physical Education and Recreation, University of Alberta, Edmonton, Alberta, Canada. kerry.mummery@ualberta.ca.
authors.forename: W K
authors.initials: WK
authors.lastname: Mummery
authors.affiliation: Priority Research Centre for Physical Activity and Nutrition, Faculty of Health and Medicine, School of Medicine & Public Health, The University of Newcastle, Callaghan, Australia. mitch.duncan@newcastle.edu.au.
authors.forename: M J
authors.initials: MJ
authors.lastname: Duncan
mesh_terms: D001294:Attitude to Health; D001315:Australia; D015444:Exercise; D005260:Female; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D020407:Internet; D008297:Male; D009042:Motivation; D015397:Program Evaluation / Q000706:statistics & numerical data*; D011788:Quality of Life; D012944:Social Support; D014741:Video Recording