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Physical activity assessment with accelerometers.

K R Westerterp1

  • 1Department of Human Biology, Maastricht University, The Netherlands.

International Journal of Obesity and Related Metabolic Disorders : Journal of the International Association for the Study of Obesity
|June 15, 1999
PubMed
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Tri-axial accelerometers accurately measure physical activity in large populations. These motion sensors offer an objective method for assessing daily activity levels and intervention effects with minimal subject discomfort.

Area of Science:

  • Biomedical Engineering
  • Exercise Physiology
  • Wearable Technology

Background:

  • Objective assessment of physical activity is crucial for public health research.
  • Traditional methods like questionnaires have limitations in accuracy and recall bias.
  • Motion sensors, specifically accelerometers, offer a promising solution for objective physical activity monitoring.

Purpose of the Study:

  • To evaluate accelerometers as objective tools for assessing physical activity in large populations.
  • To assess physical activity over extended periods representative of daily life.
  • To minimize subject discomfort during data collection.

Main Methods:

  • A review of validation studies comparing accelerometers with indirect calorimetry.
  • Evaluation of various accelerometers: one-axial (Caltrac, CSA, Actigraph) and tri-axial (Tritrac-R3D, Tracmor).

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  • Validation in free-living conditions using doubly labeled water.

    • Main Results:

    • No significant difference in correspondence between indirect calorimetry and accelerometer counts during level walking.
    • Tri-axial accelerometers better reflect sedentary activities compared to one-axial.
    • The Tracmor tri-axial accelerometer showed the highest correlation with activity-induced energy expenditure.

    Conclusions:

    • Tri-axial accelerometers are objective methods for distinguishing activity levels between individuals.
    • These devices can effectively assess the impact of interventions on physical activity.
    • The tri-axial accelerometer for movement registration (Tracmor) is a reliable tool for physical activity assessment.