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Reliability of accelerometry-based activity monitors: a generalizability study.

Gregory J Welk1, Jodee A Schaben, James R Morrow

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

Medicine and Science in Sports and Exercise
|September 9, 2004
PubMed
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This study assessed the reliability of four accelerometer types for physical activity monitoring. The CSA/MTI showed the highest reliability, while the Actical had the poorest, indicating potential concerns for research applications.

Area of Science:

  • Biomedical Engineering
  • Kinesiology
  • Public Health

Background:

  • Accelerometry-based activity monitors are widely used in research but their reliability across different units needs systematic evaluation.
  • Understanding device error is crucial for large-scale surveillance and intervention studies using multiple monitors over time.

Purpose of the Study:

  • To systematically assess the reliability of four different accelerometer types.
  • To quantify variance components and identify the most reliable accelerometer for research.

Main Methods:

  • Four accelerometer types (CSA/MTI, Biotrainer Pro, Tritrac-R3D, Actical) were tested on college-aged participants.
  • Participants completed standardized treadmill walking trials while wearing multiple units of each monitor type.
  • Generalizability (G) theory was employed to analyze variance from units, trials, and subjects.

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Main Results:

  • Overall G coefficients ranged from 0.43 to 0.64, with intraclass correlation coefficients (ICC) from 0.62 to 0.80.
  • The CSA/MTI demonstrated the least variability and highest reliability.
  • The Actical exhibited the poorest reliability among the tested devices.

Conclusions:

  • The CSA/MTI generally showed acceptable reliability (G>0.60, ICC>0.80) for research.
  • Other devices raised concerns regarding reliability, necessitating further investigation.
  • Additional research is needed to understand variability factors and improve accelerometer calibration protocols.