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Comparability of measured acceleration from accelerometry-based activity monitors.

Alex V Rowlands1, FranÇois Fraysse, Mike Catt

  • 11Health and Use of Time Group, Sansom Institute for Health Research, Division of Health Sciences, University of South Australia, Adelaide, AUSTRALIA; 2Exercise for Health and Human Performance Group, Sansom Institute for Health Research, Division of Health Sciences, University of South Australia, Adelaide, AUSTRALIA; 3Institute for Ageing and Health, Faculty of Medicine, Newcastle University, Newcastle, UNITED KINGDOM; and 4Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, Exeter, UNITED KINGDOM.

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Summary
This summary is machine-generated.

Triaxial accelerometers from different brands, ActiGraph GT3X+ and GENEActiv, show comparable frequency domain data. Time domain data requires affine conversion for interchangeability, enabling consistent activity pattern assessment.

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Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Human Movement Analysis

Background:

  • Triaxial accelerometers are widely used for objective physical activity measurement.
  • Equivalence of data output between different accelerometer brands is not guaranteed and requires empirical validation.

Purpose of the Study:

  • To assess the output equivalence between ActiGraph GT3X+ and GENEActiv accelerometers.
  • To compare accelerometer performance in both controlled laboratory settings and free-living environments.

Main Methods:

  • 38 adults performed 9 laboratory activities wearing both devices.
  • 58 children (10-12 years) wore both devices for 7 days in a free-living setting.

Main Results:

  • GENEActiv showed higher magnitude in time-domain features compared to GT3X+ in laboratory tests.
  • Frequency domain features showed high agreement (97-100%) across most activities.
  • Mean daily acceleration was correlated (r=0.93) but GT3X+ magnitude was ~15% lower than GENEActiv in free-living conditions.

Conclusions:

  • Frequency domain algorithms are transferable between ActiGraph GT3X+ and GENEActiv.
  • Time domain algorithms can be adapted using affine conversion for cross-device application.
  • Both devices can effectively assess habitual activity levels and patterns when analyzed appropriately.