Patterns of Physical Activity Progression in Patients With COPD

Area of Science:

• Pulmonary Medicine
• Exercise Physiology
• Chronic Disease Management

Background:

• Mean physical activity in Chronic Obstructive Pulmonary Disease (COPD) patients declines significantly each year.
• The heterogeneity of physical activity progression in COPD patients is not well understood.

Purpose of the Study:

• To identify distinct patterns of physical activity progression in COPD patients.
• To determine the factors associated with these different progression patterns.

Main Methods:

• Pooled data from two cohorts (Urban Training and PROactive studies) including 291 COPD patients.
• Physical activity was measured using Dynaport MoveMonitor at baseline and 12 months.
• K-means clustering was used to identify physical activity progression patterns, with subsequent analysis of associated baseline characteristics.

Main Results:

• Three distinct patterns were identified: Inactive (59%), Active Improvers (17%), and Active Decliners (24%).
• Lower 6-minute walking distance and higher mMRC dyspnea scores were associated with the Inactive pattern.
• No baseline variables predicted whether patients would become Active Improvers or Active Decliners.

Conclusions:

• Physical activity progression over time in COPD patients is heterogeneous.
• The Inactive group is associated with poorer clinical COPD characteristics.
• Predicting active improvement or decline at baseline is not possible with current data.