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Physical activity declines in COPD while exercise capacity remains stable: A longitudinal study over 5 years.
Noriane A Sievi1, Thomas Brack2, Martin H Brutsche3
1Pulmonary Division, University Hospital Zurich, Switzerland.
Respiratory Medicine
|July 29, 2018
Summary
Daily physical activity in COPD patients declines significantly over time, while exercise capacity remains stable. This suggests physical activity limitations in COPD may not stem from reduced exercise tolerance.
Area of Science:
- Pulmonary Medicine
- Cardiorespiratory Physiology
- Chronic Disease Management
Background:
- Daily physical activity (PA) and exercise capacity are often reduced in patients with Chronic Obstructive Pulmonary Disease (COPD).
- The temporal relationship between the decline in PA and exercise capacity in COPD is not well understood.
- Understanding this relationship is crucial for effective COPD management and patient rehabilitation.
Purpose of the Study:
- To investigate the longitudinal relationship between daily physical activity and exercise capacity in COPD patients.
- To determine if changes in physical activity and exercise capacity occur concurrently or if one precedes the other over time.
- To analyze the annual changes in these parameters in a cohort of COPD patients.
Main Methods:
- A longitudinal observational study involving 202 COPD patients.
- Annual assessments included the 1-minute sit-to-stand test (STS) and 6-minute walking test (6MWT) for exercise capacity.
- Daily physical activity was measured by the number of steps per day using activity trackers.
- Mixed-effects models were employed to analyze annual changes in STS, 6MWD, and daily steps over a follow-up period of 0.9 to 6.8 years.
Main Results:
- Over a mean follow-up of 2.4 years, the number of daily steps significantly decreased by an average of 451 steps per year (p < 0.001).
- In contrast, exercise capacity, as measured by the STS and 6MWD, remained stable throughout the study period.
- The study included patients across different COPD severity groups (A, B, C, D).
Conclusions:
- COPD patients experience a progressive decline in daily physical activity over time.
- This decline in physical activity is not accompanied by a corresponding decrease in exercise capacity.
- The findings suggest that factors other than reduced exercise tolerance may contribute to the longitudinal impairment of physical activity in COPD.
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