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Updated: Feb 9, 2026
08:45
Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
Published on: June 20, 2025
598
Verification of a Motion Sensor for Evaluating Physical Activity in COPD Patients
Seiko Miyamoto1, Yoshiaki Minakata1, Yuichiro Azuma1
1Department of Clinical Laboratory, National Hospital Organization Wakayama Hospital, 1138 Wada Mihama-cho, Hidaka-gun, Wakayama 644-0044, Japan.
Canadian Respiratory Journal
|June 1, 2018
Summary
The Active Style Pro HJA-750C® (HJA) accelerometer accurately measures physical activity (PA) in chronic obstructive pulmonary disease (COPD) patients. Reproducible PA data can be obtained within 3–5 days, with shorter durations on rainy days.
Area of Science:
- Pulmonary Medicine
- Biomedical Engineering
- Physical Therapy
Background:
- Objective evaluation of physical activity (PA) is crucial for managing chronic obstructive pulmonary disease (COPD).
- The Active Style Pro HJA-750C® (HJA) is a triaxial accelerometer that requires validation for PA assessment in COPD patients.
- Understanding the conditions for reproducible PA data is essential for reliable monitoring.
Purpose of the Study:
- To validate the Active Style Pro HJA-750C® (HJA) triaxial accelerometer for measuring physical activity (PA) in patients with chronic obstructive pulmonary disease (COPD).
- To determine the necessary conditions for obtaining reproducible PA data using the HJA device.
- To assess the influence of weather and holidays on PA measurements.
Main Methods:
- The HJA was compared with two validated accelerometers (DynaPort Move Monitor® and Actimarker®) in 11 COPD patients.
- The influence of weather and holidays on PA was examined in 21 COPD patients.
- Repeatability of PA measurements was assessed by analyzing data from different recording durations.
Main Results:
- HJA measurements showed significant correlation with DynaPort Move Monitor® and Actimarker® across various intensities, except for Actimarker® at ≥4.0 METs.
- Physical activity durations were significantly shorter on rainy days compared to non-rainy days.
- Intraclass correlation coefficients (ICC) exceeding 0.8 were achieved with 3, 4, or 5 days of data collection for all intensities.
- PA measured by HJA correlated with the dyspnea scale, FVC, and age, and tended to correlate with FEV1.
Conclusions:
- The Active Style Pro HJA-750C® (HJA) is a validated tool for evaluating physical activity in COPD patients.
- Reproducible PA data can be obtained within 3–5 days of monitoring.
- Weather conditions, specifically rain, can impact PA duration in COPD patients.
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