24-hour accelerometry in COPD: Exploring physical activity, sedentary behavior, sleep and clinical characteristics

Area of Science:

• Pulmonary Medicine
• Behavioral Science
• Biostatistics

Background:

• Physical activity (PA) and its complex analysis in Chronic Obstructive Pulmonary Disease (COPD) are underexplored.
• Understanding the interdependency of 24-hour physical behaviors is crucial for individuals with mild-to-moderate COPD.

Purpose of the Study:

• To examine the interrelationships of 24-hour physical behaviors in individuals with COPD and healthy controls.
• To investigate the associations between distinct physical behavior constructs and participant characteristics.

Main Methods:

• Wrist-worn accelerometry data collected from 109 individuals with COPD and 135 healthy controls.
• Principal Component Analysis (PCA) identified distinct behavioral constructs: low-intensity movement, high-intensity movement, and sleep.
• Linear regressions analyzed associations between behavioral constructs and participant characteristics.

Main Results:

• PCA identified "low-intensity movement" (stationary time, light PA, movement intensity), "high-intensity movement" (moderate-to-vigorous PA, vigorous PA), and "sleep" as distinct constructs.
• In COPD, low-intensity movement correlated with mobility limitations, daily activity, health status, and BMI.
• High-intensity movement associated with age and self-care limitations; sleep associated with gender, lung function, and body fat percentage.

Conclusions:

• The 24-hour day comprises distinct "low-intensity movement," "high-intensity movement," and "sleep" constructs.
• Each construct independently associates with different participant characteristics in COPD.
• Future research should explore modifying these behaviors to improve health outcomes in COPD.