title: Gender differences in response to a physical activity intervention in overweight and obese children.
abstract: BACKGROUND
  This study evaluated the effects of gender on response to a behavioral intervention that rewarded increases in physical activity (PA) with increases in access to TV viewing.
  
  
  METHODS
  We performed a secondary analysis of a clinical trial that randomized 30 overweight or obese, 8- to 12-year-old children to an intervention (8 boys, 6 girls) or control (7 boys, 9 girls) group. Participants wore accelerometers every day for 8 weeks and attended biweekly meetings to download the activity monitors. For the intervention group, accumulating 400 counts of PA on accelerometers earned 1 hour of TV time, which was controlled by a Token TV electronic device. Controls wore activity monitors but had free access to TV.
  
  
  RESULTS
  Compared with girls, boys in the intervention group exhibited greater increases in overall daily PA counts (110% versus 40%, P < .05) and minutes per day of moderate-to-vigorous physical activity (MVPA; +18.1 versus +2.7, P < .05). Neither boys nor girls in the control group showed significant changes in overall PA or intensity of PA.
  
  
  CONCLUSIONS
  Wearing an accelerometer in combination with rewarding PA with TV might be a more effective intervention for increasing overall PA and time spent in MVPA in overweight and obese boys than it is for overweight or obese girls.
authors.affiliation: Children's Hospital of Eastern Ontario Research Institute, Ottawa, ON, Canada.
authors.forename: Gary S
authors.initials: GS
authors.lastname: Goldfield
authors.forename: Risa
authors.initials: R
authors.lastname: Mallory
authors.forename: Denis
authors.initials: D
authors.lastname: Prud'homme
authors.forename: Kristi B
authors.initials: KB
authors.lastname: Adamo
mesh_terms: D015992:Body Mass Index; D002648:Child; D002149:Energy Intake; D030141:Feedback, Psychological; D005260:Female; D006801:Humans; D007899:Leisure Activities; D008297:Male; D008991:Monitoring, Physiologic / Q000295:instrumentation; D009042:Motivation; D009043:Motor Activity; D009765:Obesity / Q000378:metabolism / Q000517:prevention & control / Q000523:psychology* / Q000628:therapy*; D050177:Overweight / Q000378:metabolism / Q000517:prevention & control / Q000523:psychology* / Q000628:therapy*; D012737:Sex Factors; D013690:Television