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Validity of the Actical accelerometer step-count function.

Dale W Esliger1, Adam Probert, Sarah Connor Gorber

  • 1College of Kinesiology, University of Saskatchewan, Saskatoon, Canada.

Medicine and Science in Sports and Exercise
|June 29, 2007
PubMed
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The Actical accelerometer accurately estimates steps during normal walking and running speeds. This device provides valid step count data for healthy individuals at speeds of 83 and 133 m/min.

Area of Science:

  • Biomedical Engineering
  • Kinesiology
  • Wearable Technology

Background:

  • Accelerometers are widely used for objective physical activity monitoring.
  • Accurate step counting is crucial for assessing physical activity levels and health outcomes.
  • The Actical accelerometer is a new device for measuring physical activity, including step counts.

Purpose of the Study:

  • To evaluate the accuracy of the Actical accelerometer's step count function.
  • To compare Actical step counts against established criterion measures.

Main Methods:

  • Actical devices were tested on a mechanical shaker table under various conditions.
  • Thirty-eight participants (aged 9-59 years) wore Actical and Actigraph devices during treadmill walking and running.

Related Experiment Videos

  • Steps were visually counted by an observer to serve as a criterion standard.

    • Main Results:

    • Actical step counts showed excellent correlation (r=1.0) with mechanical shaker counts.
    • Both Actical and Actigraph showed significant differences at slow walking speeds (50 m/min) compared to visual counts.
    • High correlations (r=0.99) were observed for Actical and Actigraph at normal walking (83 m/min) and running (133 m/min) speeds.

    Conclusions:

    • The Actical accelerometer's step count function is valid for speeds of 83 and 133 m/min.
    • The device provides reliable step count estimates in a diverse group of healthy individuals.
    • Actical demonstrates potential as a valid tool for physical activity assessment in research and clinical settings.