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Tracking physical activity and sedentary behavior in young children.

Louise A Kelly1, John J Reilly, Diane M Jackson

  • 1Dept. Of Preventive Medicine, The University of Southern California, Los Angeles, CA 90033, USA.

Pediatric Exercise Science
|June 8, 2007
PubMed
Summary

Physical activity tracking in young children showed low consistency over two years. Total physical activity (PA), moderate to vigorous physical activity (MVPA), and sedentary behavior levels were not reliably maintained.

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Area of Science:

  • Pediatrics
  • Public Health
  • Kinesiology

Background:

  • Childhood physical activity (PA) is crucial for long-term health.
  • Understanding the stability of PA behaviors in early childhood is important for developing effective interventions.
  • Previous research on PA tracking in young children is limited.

Purpose of the Study:

  • To assess the tracking of total physical activity (PA), moderate to vigorous physical activity (MVPA), and sedentary behavior over a two-year period in young Scottish children.
  • To analyze the reliability of physical activity measurements in early childhood.

Main Methods:

  • A cohort of 42 young children (mean age 3.8 years) was studied over 2 years.
  • Actigraph accelerometers were used to measure total PA, MVPA, and sedentary behavior.

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  • Spearman rank correlations, percentage agreements, and kappa statistics were employed for analysis.

    • Main Results:

    • Spearman correlations for total PA, MVPA, and sedentary behavior were low (r = .35 to .37, p = .002).
    • Percentage agreements ranged from 26% to 41%.
    • Kappa statistics indicated poor to fair reliability for all measures.

    Conclusions:

    • There are low levels of tracking for total PA, MVPA, and sedentary behavior in young Scottish children over a 2-year timeframe.
    • Physical activity patterns in early childhood may be unstable.
    • Further research is needed to identify factors influencing PA stability in this age group.