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Accelerometer test-retest reliability by data processing algorithms: results from the Twin Cities Walking Study.

John R Sirard1, Ann Forsyth, J Michael Oakes

  • 1Dept of Epidemiology and Community Health, University of Minnesota, Minneapolis, MN, USA.

Journal of Physical Activity & Health
|July 8, 2011
PubMed
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Adult accelerometer-measured physical activity is highly reliable over a 7-day period. However, data processing choices significantly impact physical activity levels and reliability, demonstrating the need for standardized algorithms.

Area of Science:

  • Exercise Physiology
  • Biomedical Engineering
  • Wearable Technology

Background:

  • Objective measurement of physical activity is crucial for health research.
  • Accelerometers are widely used to assess physical activity in free-living conditions.
  • Understanding the reliability and data processing impacts is essential for accurate interpretation.

Purpose of the Study:

  • To assess the test-retest reliability of accelerometer-measured physical activity in adults.
  • To investigate how different data processing algorithms influence physical activity metrics and reliability.

Main Methods:

  • 143 adults participated, wearing ActiGraph accelerometers for two 7-day periods separated by 1-4 weeks.
  • Five distinct algorithms were applied to process the accelerometer data, varying nonwear criteria and minimum wear time.

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  • Data processing involved analyzing counts per day, sedentary time, and moderate-to-vigorous physical activity.

    • Main Results:

    • Different processing algorithms yielded varying results for daily physical activity, sedentary time, and moderate-to-vigorous activity.
    • Test-retest reliability, measured by intraclass correlation coefficients (ICC), was consistently very good to excellent (0.70-0.90) across most algorithms.
    • No significant differences were observed in physical activity measures between the two measurement periods (Time 1 and Time 2).

    Conclusions:

    • This study provides the first evaluation of ActiGraph test-retest reliability in free-living adults over separate administrations.
    • The ActiGraph demonstrates high reliability for measuring 7-day physical activity in natural environments.
    • The findings highlight that accelerometer data are sensitive to the specific algorithms used for processing.