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Interval versus continuous training in patients with severe COPD: a randomized clinical trial
R Coppoolse1, A M Schols, E M Baarends
1Dept of Pulmonology, Maastricht University, The Netherlands.
The European Respiratory Journal
|October 9, 1999
Summary
Continuous training improved oxygen consumption and ventilation efficiency in severe COPD patients. Interval training increased workload capacity and reduced leg pain, suggesting distinct physiological benefits for different exercise types in COPD management.
Area of Science:
- Exercise Physiology
- Pulmonary Rehabilitation
- Chronic Obstructive Pulmonary Disease (COPD)
Background:
- Limited data exists on physiological responses to exercise in severe COPD patients.
- Understanding exercise training effects is crucial for pulmonary rehabilitation.
Purpose of the Study:
- To investigate physiological responses to training at 60% peak load in severe COPD.
- To compare the effects of interval (I) versus continuous (C) training in these patients.
Main Methods:
- Twenty-one severe COPD patients (FEV1: 37+/-15%) underwent 8 weeks of I or C training on a cycle ergometer.
- Training was performed 5 days/week, 30 min/day, with equal total workload for both groups.
- Evaluations included baseline and post-training physiological measurements during exercise.
Main Results:
- Continuous training significantly increased peak oxygen consumption (17%) and improved ventilation efficiency (V'E/V'O2, V'E/V'CO2).
- Interval training led to a significant increase in peak workload (17%) and reduced leg pain.
- Both training types increased maximal inspiratory mouth pressure, with a larger increase after interval training.
Conclusions:
- Interval and continuous training elicit different physiological responses in severe COPD patients.
- These differences may reflect specific adaptations in muscle metabolic pathways (oxidative vs. glycolytic).
- Further research is needed to optimize exercise programming for specific COPD patient profiles.