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Home-Based Prescribed Pulmonary Exercise in Patients with Stable Chronic Obstructive Pulmonary Disease
Published on: August 24, 2019
Clinical relevance of constant power exercise duration changes in COPD
L Puente-Maestu1, F Villar, J de Miguel
1Hospital General Universitario Gregorio Marañón, Servicio de Neumología, Madrid, Spain. lpuente.hgugm@salud.madrid.org
The European Respiratory Journal
|March 3, 2009
Summary
The minimum clinically important difference for endurance time during high work-rate exercise (t(LIM)) in COPD patients is about 33%. This helps assess pulmonary rehabilitation effectiveness and exercise capacity improvements.
Area of Science:
- Pulmonary Medicine
- Exercise Physiology
Background:
- Endurance time during high work-rate exercise (t(LIM)) is a key measure for exercise capacity in COPD patients.
- t(LIM) is also a crucial outcome in pulmonary rehabilitation programs.
Purpose of the Study:
- To determine the minimum clinically important difference (MCID) for t(LIM) in patients undergoing pulmonary rehabilitation.
- To establish a quantifiable threshold for meaningful improvement in exercise tolerance.
Main Methods:
- 105 COPD patients (86 males) had t(LIM) measured before and after an 8-week outpatient pulmonary rehabilitation program.
- Patients self-reported perceived changes in exercise performance using a 5-point Likert scale.
- Statistical analysis was performed to correlate perceived improvement with objective t(LIM) changes.
Main Results:
- Pulmonary rehabilitation increased mean t(LIM) by 62% from baseline.
- Patients reporting 'slightly better' exercise tolerance showed a mean improvement of 34% (101 s).
- The MCID for t(LIM) was established at approximately 33% of baseline, with patients distinguishing further benefit at 120% of baseline.
Conclusions:
- A 33% improvement in t(LIM) represents a clinically meaningful change for COPD patients post-pulmonary rehabilitation.
- This finding provides a valuable benchmark for evaluating the efficacy of interventions aimed at improving exercise capacity in this population.
- Patients can discern distinct levels of benefit related to t(LIM) improvements.
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