title: Longitudinal change in active and sedentary behavior during the after-school hour.
abstract: BACKGROUND
  Relatively little is known regarding after-school behavior. This study examined after-school active and sedentary behaviors among youth participating in the Study of Early Child Care and Youth Development.
  
  
  METHODS
  An interview guided time-use approach was used to obtain detailed longitudinal information about after-school (3-6 PM) behavior of a mixed gender cohort (n = 886) at ages 9 and 11 yrs. Responses obtained in 15-min intervals were coded into 29 exclusive behaviors and separated into 3 main categories [moderate and vigorous-intensity physical activity (MVPA), light-intensity physical activity, and sedentary]. Sedentary category was further divided into screen and nonscreen categories. A mixed ANOVA design was used to examine gender and age-related differences in MVPA, light-intensity physical activity, sedentary, screen, and nonscreen.
  
  
  RESULTS
  MVPA was higher among boys compared with girls (P < .001) and decreased from 9 to 11 yrs (P < .001). Overall, total sedentary time was comparable between boys and girls despite a difference in reported screen time (boys > girls; P < .001) and nonscreen time (boys < girls; P < .001). Total sedentary time increased from 9 to 11 yrs (P < .001).
  
  
  CONCLUSIONS
  Engagement in after-school behavior appears to change during preadolescence. Additional research is needed to understand factors associated with the selection of active and sedentary behavior over time.
authors: Dept of Exercise and Sports Science, University of Tulsa, Tulsa, OK, USA.
authors: Eric E
authors: EE
authors: Wickel
authors: Johann
authors: J
authors: Issartel
authors: Sarahjane
authors: S
authors: Belton
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D007407:Interviews as Topic; D008137:Longitudinal Studies; D008297:Male; D009043:Motor Activity; D011998:Recreation; D057185:Sedentary Behavior; D014481:United States