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Related Experiment Videos

Quantitating physical activity in COPD using a triaxial accelerometer.

B G Steele1, L Holt, B Belza

  • 1Department of Biobehavioral Nursing and Health, University of Washington School of Nursing, Seattle, WA 98108, USA. Bonnie.Steele@med.va.gov

Chest
|May 16, 2000
PubMed
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A triaxial accelerometer reliably measures walking and daily activity in patients with Chronic Obstructive Pulmonary Disease (COPD). This device offers a more accurate assessment of physical functioning than self-report methods.

Area of Science:

  • Pulmonary Medicine
  • Biomedical Engineering
  • Rehabilitation Science

Background:

  • Chronic Obstructive Pulmonary Disease (COPD) significantly impacts daily physical activity and functional capacity.
  • Accurate measurement of physical activity is crucial for managing COPD and evaluating rehabilitation effectiveness.
  • Current self-report measures may not precisely capture the nuances of daily physical functioning in COPD patients.

Purpose of the Study:

  • To assess the reliability, validity, and stability of a triaxial accelerometer for measuring walking and daily activity in individuals with COPD.
  • To compare accelerometer-based activity measures with established indicators of functional capacity and disease severity.

Main Methods:

  • A cross-sectional, correlational, descriptive study design was employed.

Related Experiment Videos

  • Forty-seven outpatients with stable COPD participated, undergoing assessments within a pulmonary rehabilitation program.
  • A triaxial movement sensor (Tritrac R3D) was used to measure walking during 6-minute walks and daily activity over three days.

    • Main Results:

    • The triaxial accelerometer demonstrated high test-retest reliability (rICC = 0.84) for walking.
    • Concurrent validity for walking was strong (Pearson correlations ranging from 0.84 to 0.95).
    • The accelerometer showed significant correlations with exercise capacity (r=0.74), disease severity (r=0.62), dyspnea (r=-0.29), and self-efficacy (r=0.43), but not with self-reported activity (r=0.14).
    • Stability for measuring daily activity over three days was adequate (rICC = 0.69).

    Conclusions:

    • The triaxial accelerometer is a reliable, valid, and stable tool for assessing walking and daily physical activity in COPD patients.
    • It offers a more precise measurement of everyday physical functioning compared to current self-report methods.
    • This technology can provide valuable insights into functional status dimensions previously not well-described in COPD research and clinical practice.