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Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
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Epoch length and its effect on physical activity intensity.

Charlotte L Edwardson1, Trish Gorely

  • 1Institute of Youth Sport, School of Sport, Exercise & Health Sciences, Loughborough University, Loughborough, United Kingdom. C.L.Edwardson2@lboro.ac.uk

Medicine and Science in Sports and Exercise
|December 10, 2009
PubMed
Summary

Shorter epoch lengths (5-15 seconds) provide a more accurate measure of children's and adolescents' physical activity levels. Using longer epochs can misrepresent activity, making comparisons between studies difficult.

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Area of Science:

  • Pediatric Exercise Science
  • Biomedical Data Analysis

Background:

  • Limited research exists on epoch length effects on physical activity measurement in children.
  • Adolescents have not been studied regarding epoch length's impact on physical activity data.

Purpose of the Study:

  • To investigate how different epoch lengths (5, 15, 30, 60 seconds) affect physical activity measurements.
  • To compare these effects in child and adolescent populations.

Main Methods:

  • 311 children (7-11 yrs) and 234 adolescents (12-16 yrs) wore accelerometers for 7 days.
  • Initial data recorded in 5-second epochs, then reintegrated into 15, 30, and 60-second epochs.

Main Results:

  • Significant epoch effects were observed for vigorous, light physical activity, and rest in both age groups.
  • Moderate-to-vigorous and moderate physical activities showed epoch effects in children only.
  • Bland-Altman analysis indicated agreement between shorter epochs (5-30s) and longer epochs (up to 60s) with variations between age groups.

Conclusions:

  • Short epoch lengths (e.g., 5 seconds) are recommended for accurate assessment of physical activity in children and adolescents.
  • Using different epoch lengths (e.g., 5 vs. 60s) can lead to incomparable findings in activity prevalence studies.