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Related Experiment Videos

Validation of the CSA accelerometer for assessing children's physical activity

K F Janz1

  • 1Department of Physical Education and Sports Studies, University of Iowa, Iowa City 52242.

Medicine and Science in Sports and Exercise
|March 1, 1994
PubMed
Summary

The Computer Science Application (CSA) accelerometer accurately measures children's physical activity in field settings. However, multiple days of monitoring are needed to capture typical activity levels.

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Area of Science:

  • Pediatric Exercise Science
  • Biomedical Engineering
  • Human Movement Analysis

Background:

  • Objective measurement of children's physical activity is crucial for understanding health behaviors.
  • Field-based assessments require valid and reliable instrumentation.
  • The Computer Science Application (CSA) accelerometer is a device designed for motion detection.

Purpose of the Study:

  • To evaluate the validity and utility of the CSA accelerometer for measuring children's physical activity in field settings.
  • To compare CSA accelerometer data with heart rate telemetry as a criterion measure.
  • To examine the between-day stability of physical activity measurements in children.

Main Methods:

  • Thirty-one children (aged 7-15 years) participated in the study.

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  • Participants wore a CSA accelerometer and a heart rate telemetry monitor for 12 hours per day over 3 consecutive days.
  • Validity was assessed by correlation coefficients between accelerometry and heart rate telemetry.

    • Main Results:

    • Validity correlation coefficients between accelerometry and heart rate telemetry ranged from r = 0.50-0.74 across monitored days.
    • Children reported the CSA accelerometer as comfortable to wear.
    • Between-day stability of physical activity measures was low to moderate (r = -0.23 to 0.53).

    Conclusions:

    • The CSA accelerometer demonstrates moderate to high validity and utility for objective monitoring of children's physical activity in field settings.
    • Favorable subject response supports its practical application.
    • Extended monitoring periods (more than 3 days) are recommended to accurately assess usual physical activity levels due to low between-day stability.