title: Adolescent patterns of physical activity differences by gender, day, and time of day.
abstract: BACKGROUND
  More information about the physical activity of adolescents is needed. This study used objective measurement to investigate differences in activity patterns related to gender, body mass index (BMI), day, and time of day.
  
  
  METHODS
  Eighth-grade adolescents (37 boys, 44 girls) wore the Manufacturing Technologies Inc. (MTI) accelerometer for 4 days and kept a previous-day physical activity recall diary in the fall of 2002. Minutes per hour in sedentary, light, and moderate/vigorous activity, as recorded by the MTI, and in nine activity categories, as recorded by the diary, were calculated for three time periods (6:00 am to 2:59 pm, 3:00 pm to 6:59 pm, 7:00 pm to midnight) on each day (Thursday through Sunday).
  
  
  RESULTS
  Doubly multivariate analysis of variance revealed significant gender by day by time differences in sedentary (p =0.005) and moderate/vigorous (p <0.001) activity, but no significant BMI interactions. Except on Sunday, boys were less sedentary and more active than girls during the late afternoon period. Significant gender by category (p <0.001) and day by category (p <0.001) interactions were also found in the log data. Boys spent more time engaged in TV/electronics and sports, while girls spent more time in personal care. Three activity categories (sports, social interaction, active transportation) stayed at consistent levels across days, while others varied widely by day of the week.
  
  
  CONCLUSIONS
  Except on Sunday, consistent gender differences were found in activity levels, especially for the late afternoon period. Significant increases in sitting, TV/electronic games, and chores were seen for weekend days. Results support strategies to reduce sitting and electronic recreation, which may increase physical activity.
authors.affiliation: Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA. russ.jago@gmail.com
authors.forename: Russell
authors.initials: R
authors.lastname: Jago
authors.forename: Cheryl B
authors.initials: CB
authors.lastname: Anderson
authors.forename: Tom
authors.initials: T
authors.lastname: Baranowski
authors.forename: Kathy
authors.initials: K
authors.lastname: Watson
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D003625:Data Collection; D015444:Exercise; D005260:Female; D006801:Humans; D008019:Life Style; D008297:Male; D012737:Sex Factors; D013781:Texas; D013997:Time Factors