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Comparison of dyspnea ratings during submaximal constant work exercise with incremental testing
M J Franco1, E M Olmstead, A N Tosteson
1Department of Medicine, Dartmouth Medical School, Lebanon, NH 03756-0001, USA.
Medicine and Science in Sports and Exercise
|May 5, 1998
Summary
Dyspnea ratings in chronic obstructive pulmonary disease (COPD) patients were similar at high exercise intensities but higher at low intensities during submaximal versus incremental exercise. These findings support using incremental exercise ratings for training targets.
Area of Science:
- Pulmonary Rehabilitation
- Exercise Physiology
- Respiratory Medicine
Background:
- Chronic obstructive pulmonary disease (COPD) significantly impacts exercise capacity and quality of life.
- Dyspnea, or shortness of breath, is a primary limiting symptom in COPD patients during physical activity.
- Understanding dyspnea perception during different exercise protocols is crucial for effective pulmonary rehabilitation.
Purpose of the Study:
- To compare patient-reported dyspnea ratings during submaximal (training-based) and incremental (testing-based) exercise at equivalent intensities in individuals with COPD.
- To assess the reliability of dyspnea ratings from incremental exercise for guiding submaximal exercise prescription in COPD management.
Main Methods:
- Twenty patients diagnosed with COPD (mean age 66 years, FEV1 43% predicted) participated in the study.
- Dyspnea was rated on a 0-10 scale every minute during incremental cycle ergometer exercise.
- Patients also rated dyspnea during 10-minute steady-state submaximal exercise at two different intensities.
Main Results:
- At 55% of peak oxygen consumption (VO2), dyspnea ratings were significantly higher during submaximal exercise (2.0) compared to incremental exercise (1.1).
- At a higher intensity (77% of peak VO2), dyspnea ratings were similar between the two exercise protocols (4.3 vs 3.9).
- Oxygen consumption (VO2) remained stable during submaximal exercise, though dyspnea perception slightly increased over time.
Conclusions:
- Dyspnea perception during steady-state submaximal exercise aligns with equivalent high-intensity levels during incremental exercise in COPD patients.
- Slightly higher dyspnea ratings were observed at lower exercise intensities during submaximal compared to incremental protocols.
- Dyspnea ratings from incremental exercise tests show potential utility as targets for exercise training prescription in respiratory disease management.