title: The prevalence of leisure time sedentary behaviour and physical activity in adolescent boys: an ecological momentary assessment approach.
abstract: OBJECTIVE
  To use ecological momentary assessment to describe how adolescent boys in the United Kingdom spend their leisure time. Design. Cross-sectional, stratified, random sample from secondary schools in 15 regions within the United Kingdom. The data are from a larger study of adolescent lifestyles (Project STIL).
  
  
  METHODS
  A total of 561 boys with a mean age of 14.6 years (range 12.7-16.7 years). The majority were white-European (86.5%).
  
  
  RESULTS
  Television viewing occupied the most leisure time on both weekdays (131 minutes) and weekend (202.5 minutes) days. On weekdays the five most time consuming sedentary activities (television viewing, homework, motorised travel, playing computer/video games and shopping/hanging out) occupied on average 272.2 minutes. On weekend days, the five most time consuming sedentary activities (television viewing, shopping/hanging out, motorised travel, sitting and talking and playing computer/video games) occupied 405.5 minutes. In total, 54 minutes were occupied by active transport or sports and exercise per weekday and 81 minutes per weekend day. Only a minority watched more than 4 hours of TV per day (8.9% on weekdays and 33.8% on weekend days). Differences were noted in the means and prevalence between weekend and weekdays, reflecting the greater discretionary time available at the weekend.
  
  
  CONCLUSIONS
  Adolescent boys engage in a variety of sedentary and active free time behaviours. It appears prudent to encourage adolescents to adopt overall healthy lifestyles by considering the combination of both active and sedentary pursuits an individual engages in and by moving beyond a focus on any one single behaviour.
authors.affiliation: Loughborough University, Loughborough, UK. p.j.gorely@lboro.ac.uk
authors.forename: Trish
authors.initials: T
authors.lastname: Gorely
authors.forename: Stuart J H
authors.initials: SJ
authors.lastname: Biddle
authors.forename: Simon J
authors.initials: SJ
authors.lastname: Marshall
authors.forename: Noel
authors.initials: N
authors.lastname: Cameron
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D001336:Automobiles; D003201:Computers; D003430:Cross-Sectional Studies; D015444:Exercise; D015438:Health Behavior; D006293:Health Promotion; D006686:Hobbies; D006801:Humans; D007899:Leisure Activities; D008297:Male; D009146:Music; D057185:Sedentary Behavior; D013689:Telephone; D013690:Television; D013997:Time Factors; D014195:Travel; D006113:United Kingdom; D018910:Video Games