Opal Actigraphy (Activity and Sleep) Measures Compared to ActiGraph: A Validation Study

Area of Science:

• Biomedical Engineering
• Wearable Technology
• Health Monitoring

Background:

• Physical activity and sleep monitoring are crucial for assessing health and fitness.
• Wearable actigraphy devices are widely used for objective measurement of these parameters.
• Validating new actigraphy solutions against established devices is essential for reliable data collection.

Purpose of the Study:

• To establish the concurrent validity of the Opal Actigraphy solution.
• To compare Opal Actigraphy's physical activity and sleep measurements with the ActiGraph GT9X.
• To assess the reliability of Opal Actigraphy in real-world settings.

Main Methods:

• Twenty participants wore both Opal Actigraphy and ActiGraph GT9X devices for 7 days.
• Three-dimensional accelerometry data were collected at 30 Hz.
• Statistical analyses included Bland-Altman plots and intraclass correlation coefficients (ICCs).

Main Results:

• Excellent reliability was found for physical activity measures between Opal and ActiGraph.
• Moderate-to-excellent reliability was observed for sleep measures.
• Performance was comparable between Opal and ActiGraph, with mean absolute percentage error within 10% for most measures.

Conclusions:

• Opal Actigraphy demonstrates concurrent validity and comparable performance to ActiGraph GT9X.
• The findings support the use of Opal Actigraphy for quantifying physical activity and monitoring sleep.
• Opal Actigraphy is suitable for application in research and clinical studies requiring accurate activity and sleep data.