title: It's A-bout Time: Detailed Patterns of Physical Activity in Obese Adolescents Participating in a Lifestyle Intervention.
abstract: BACKGROUND
  The detailed patterns of physical activity and sedentary behaviors of overweight and obese adolescents are unknown, but may be important for health outcomes and targeted intervention design.
  
  
  METHODS
  Participants completed Curtin University's Activity, Food and Attitudes Program (CAFAP), an 8-week intervention with 12 months of maintenance intervention. Physical activity and sedentary time were assessed at 6 time periods with accelerometers and were analyzed by 1) time and type of day, 2) intensity bout patterns using exposure variation analysis, and 3) individual case analysis.
  
  
  RESULTS
  Participants (n = 56) spent a lower percentage of time at baseline in light activity during school days compared with weekend days (24.4% vs 29.0%, P = .004). The majority of time was in long uninterrupted sedentary bouts of greater than 30 minutes (26.7% of total time, 36.8% of sedentary time at baseline). Moderate activity was accumulated in short bouts of less than 5 minutes (3.1% of total time, 76.0% moderate time). Changes varied by individuals.
  
  
  CONCLUSIONS
  Exposure variation analysis revealed specific changes in activity patterns in overweight and obese adolescents who participated in a lifestyle intervention. A better understanding of these patterns can help to design interventions that meaningfully affect specific behaviors, with unique health consequences.
authors.affiliation: Dept of Physiotherapy and Exercise Science, Curtin University, Perth, WA, Australia.
authors.forename: Erin Kaye
authors.initials: EK
authors.lastname: Howie
authors.forename: Timothy
authors.initials: T
authors.lastname: Olds
authors.forename: Joanne A
authors.initials: JA
authors.lastname: McVeigh
authors.forename: Rebecca A
authors.initials: RA
authors.lastname: Abbott
authors.forename: Leon
authors.initials: L
authors.lastname: Straker
mesh_terms: D061725:Accelerometry; D000204:Activity Cycles; D000293:Adolescent; D015444:Exercise; D005260:Female; D006801:Humans; D008019:Life Style; D008297:Male; D009043:Motor Activity; D050177:Overweight / Q000628:therapy*; D063766:Pediatric Obesity / Q000628:therapy*; D057185:Sedentary Behavior; D012931:Social Environment