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Actical accelerometer sedentary activity thresholds for adults.

Suzy Lai Wong1, Rachel Colley, Sarah Connor Gorber

  • 1Health Analysis Division, Statistics Canada, Ottawa, Canada.

Journal of Physical Activity & Health
|May 21, 2011
PubMed
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A threshold of 100 counts per minute (cpm) on the Actical accelerometer is appropriate for classifying sedentary activity in adults. This finding helps accurately measure sedentary behavior in adult populations.

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Area of Science:

  • Physical activity measurement
  • Sedentary behavior research
  • Biomedical engineering

Background:

  • Actical accelerometer thresholds for sedentary activity are established for children and adolescents, but not adults.
  • Objective measurement of sedentary behavior in adults requires validated thresholds.
  • This study addresses the need for adult-specific sedentary activity thresholds using the Actical accelerometer.

Purpose of the Study:

  • To determine appropriate Actical accelerometer thresholds for defining sedentary activity in adults.
  • To validate existing or propose new thresholds for adult sedentary behavior measurement.
  • To enhance the accuracy of sedentary behavior assessment in adult populations.

Main Methods:

  • Utilized data from 3187 participants (ages 6-79) from the Canadian Health Measures Survey.
  • Participants wore an Actical accelerometer for 7 days, collecting step count data.
  • Evaluated thresholds of 50, 100, and 800 counts per minute (cpm) for classifying sedentary minutes.

Main Results:

  • Higher cpm thresholds improved the correct classification of sedentary minutes.
  • A threshold of 800 cpm resulted in a significantly higher percentage of incorrectly classified sedentary minutes compared to 50 or 100 cpm.
  • Threshold performance was consistent across children, adolescents, and adults.

Conclusions:

  • A threshold of 100 cpm is recommended for classifying adult sedentary activity with the Actical accelerometer.
  • Minutes registering below 100 cpm should be considered sedentary activity.
  • This provides a validated method for objective sedentary behavior measurement in adults.