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A comparative evaluation of three accelerometry-based physical activity monitors.

G J Welk1, S N Blair, K Wood

  • 1Health and Human Performance Department, Iowa State University, Ames 50011, USA. gwelk@iastate.edu

Medicine and Science in Sports and Exercise
|September 19, 2000
PubMed
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Activity monitors show promise for tracking physical activity. However, their accuracy varies, with some overestimating energy expenditure in labs and underestimating it in real-world settings.

Area of Science:

  • Exercise Physiology
  • Biomedical Engineering
  • Wearable Technology

Background:

  • Accelerometry-based activity monitors offer objective assessment of free-living physical activity.
  • These devices provide data on frequency, intensity, and duration with minimal participant burden.

Purpose of the Study:

  • Evaluate the absolute and relative validity of three activity monitors: Computer Science and Applications, Inc. (CSA), Tritrac, and Biotrainer.
  • Assess monitor performance under both controlled laboratory and free-living field conditions.

Main Methods:

  • Fifty-two participants engaged in 30-minute choreographed routines simulating lifestyle activities.
  • Laboratory validation involved treadmill activities at varying paces; field validation examined six different lifestyle activities.

Related Experiment Videos

  • Activity levels were simultaneously measured by the three monitors and indirect calorimetry.

    • Main Results:

    • Correlations with measured VO2 were higher for treadmill activity (mean r = 0.86) than lifestyle activity (mean r = 0.55).
    • Monitors showed high inter-correlations (treadmill: r = 0.86; lifestyle: r = 0.70).
    • CSA accurately predicted energy expenditure (EE) in the lab; Tritrac and Biotrainer overestimated EE (101-136%). Tritrac had less individual error.
    • All monitors underestimated EE in field conditions (42-67% of measured value).

    Conclusions:

    • Differences in monitor accuracy are primarily due to calibration equations, not the devices themselves.
    • Further research is required to optimize the use of these devices for field-based physical activity assessments.