title: Understanding the physical and social contexts of children's nonschool sedentary behavior: an ecological momentary assessment study.
abstract: BACKGROUND
  Research on children's sedentary behavior has relied on recall-based self-report or accelerometer methods, which do not assess the context of such behavior.
  
  
  OBJECTIVE
  This study used ecological momentary assessment (EMA) to determine where and with whom children's sedentary behavior occurs during their nonschool time.
  
  
  METHODS
  Children (N = 120) ages 9-13 years (51% male, 33% Hispanic) wore mobile phones that prompted surveys (20 total) for 4 days. Surveys measured current activity (eg, exercise, watching TV), physical location (eg, home, outdoors), and social company (eg, family, friends).
  
  
  RESULTS
  Children engaged in a greater percentage of leisure-oriented (eg, watching TV) than productive (eg, reading, doing homework) sedentary behavior (70% vs 30%, respectively). Most of children's sedentary activity occurred at home (85%). Children's sedentary activity took place most often with family members (58%). Differences in physical context of sedentary behavior were found for older vs. younger children (P < .05). Type of sedentary behavior differed by gender, racial/ethnic group, and social context (P < .05).
  
  
  CONCLUSIONS
  Children may prefer or have greater opportunities to be sedentary in some contexts than others. Research demonstrates the potential for using EMA to capture real-time information about children's sedentary behavior during their nonschool time.
authors.affiliation: Dept of Preventive Medicine, University of Southern California, Los Angeles, CA.
authors.forename: Yue
authors.initials: Y
authors.lastname: Liao
authors.forename: Stephen
authors.initials: S
authors.lastname: Intille
authors.forename: Jennifer
authors.initials: J
authors.lastname: Wolch
authors.forename: Mary Ann
authors.initials: MA
authors.lastname: Pentz
authors.forename: Genevieve Fridlund
authors.initials: GF
authors.lastname: Dunton
mesh_terms: D000293:Adolescent; D002140:California; D040421:Cell Phone; D002648:Child; D002652:Child Behavior; D015444:Exercise / Q000523:psychology; D005190:Family; D005260:Female; D006306:Health Surveys; D006801:Humans; D007899:Leisure Activities; D008297:Male; D018670:Monitoring, Ambulatory / Q000379:methods*; D009043:Motor Activity; D012107:Research Design; D057185:Sedentary Behavior; D012737:Sex Factors; D012931:Social Environment; D013997:Time Factors