title: Locations of joint physical activity in parent-child pairs based on accelerometer and GPS monitoring.
abstract: BACKGROUND
  Parental factors may play an important role in influencing children's physical activity levels.
  
  
  OBJECTIVE
  This cross-sectional study sought to describe the locations of joint physical activity among parents and children.
  
  
  METHODS
  Parent-child pairs (N = 291) wore an Actigraph GT2M accelerometer and GlobalSat BT-335 global positioning systems (GPS) device over the same 7-day period. Children were ages 8-14 years. Joint behavior was defined by a linear separation distance of less than 50 m between parent and child. Land use classifications were assigned to GPS datapoints.
  
  
  RESULTS
  Joint physical activity was spread across residential locations (35 %), and commercial venues (24 %), and open spaces/parks (20 %). Obese children and parents performed less joint physical activity in open spaces/parks than under/normal weight children and parents (ps < 0.01).
  
  
  CONCLUSIONS
  Understanding where joint parent-child physical activity naturally occurs may inform location-based interventions to promote these behaviors.
authors.affiliation: Department of Preventive Medicine, University of Southern California, Los Angeles, CA 90033-9045, USA. dunton@usc.edu
authors.forename: Genevieve Fridlund
authors.initials: GF
authors.lastname: Dunton
authors.forename: Yue
authors.initials: Y
authors.lastname: Liao
authors.forename: Estela
authors.initials: E
authors.lastname: Almanza
authors.forename: Micheal
authors.initials: M
authors.lastname: Jerrett
authors.forename: Donna
authors.initials: D
authors.lastname: Spruijt-Metz
authors.forename: Mary Ann
authors.initials: MA
authors.lastname: Pentz
mesh_terms: D061725:Accelerometry; D000293:Adolescent; D000328:Adult; D001827:Body Height; D001835:Body Weight; D002140:California; D002648:Child; D003430:Cross-Sectional Studies; D003710:Demography; D004777:Environment; D005260:Female; D040362:Geographic Information Systems; D006801:Humans; D008297:Male; D009043:Motor Activity; D009765:Obesity; D010287:Parent-Child Relations; D057185:Sedentary Behavior