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Physical activity in children measured by accelerometry: stability over time.

G Nyberg1, U Ekelund, C Marcus

  • 1Department of Clinical Science, Intervention and Technology, National Childhood Obesity Centre, Division of Pediatrics, Karolinska Institutet, Stockholm, Sweden. gisela.nyberg@karolinska.se

Scandinavian Journal of Medicine & Science in Sports
|February 6, 2008
PubMed
Summary

Physical activity in Swedish children aged 6-10 is fairly stable. Baseline activity levels strongly predict future activity, especially in boys, with higher activity being more consistent over time.

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Area of Science:

  • Pediatrics
  • Sports Science
  • Public Health

Background:

  • Childhood physical activity is crucial for long-term health.
  • Understanding the stability of physical activity is key for effective health interventions.
  • Previous research has yielded mixed results on physical activity stability in children.

Purpose of the Study:

  • To assess the stability of objectively measured physical activity in Swedish children.
  • To identify predictors of physical activity and Body Mass Index (BMI) standard deviation score (SDS) at follow-up.
  • To analyze the influence of baseline activity and seasonal variations on follow-up measurements.

Main Methods:

  • Utilized accelerometer data to objectively measure physical activity in 97 Swedish children over approximately 1.5 years.

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  • Collected yearly weight and height measurements to calculate BMI SDS.
  • Employed correlation and regression analyses to determine stability and predictive factors.

    • Main Results:

    • Baseline physical activity showed a significant correlation with follow-up activity (r=0.59), stronger in boys (r=0.72) than girls (r=0.51).
    • High physical activity levels demonstrated greater stability (r=0.74) compared to low levels (r=0.55).
    • Physical activity at follow-up was predicted by baseline activity and season (R(2)=0.46), while BMI SDS was predicted by baseline BMI SDS and age (R(2)=0.90).

    Conclusions:

    • Objectively measured physical activity is fairly stable in 6-10-year-old children.
    • Early physical activity levels and seasonal factors are important predictors of sustained activity.
    • Baseline BMI SDS and age are significant predictors of BMI SDS trajectory in this age group.