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Comparing peak and submaximal cardiorespiratory responses during field walking tests with incremental cycle ergometry
Kylie Hill1, Thomas E Dolmage, Lynda Woon
1Respiratory Medicine, West Park Healthcare Centre, University of Toronto, Toronto, Canada.
Respirology (Carlton, Vic.)
|October 20, 2011
Summary
Field walking tests, like the 6-minute walk test, show similar peak oxygen uptake and heart rate responses to laboratory cycle ergometer tests in COPD patients. These findings indicate that walking tests effectively reach high exercise intensities.
Area of Science:
- Respiratory Medicine
- Exercise Physiology
- Pulmonary Rehabilitation
Background:
- Exercise capacity assessment is crucial for managing Chronic Obstructive Pulmonary Disease (COPD).
- Both field-based and laboratory tests are utilized to measure exercise capacity in COPD patients.
- A direct comparison of cardiorespiratory responses between field and laboratory tests is needed to understand their relative physiological demands.
Purpose of the Study:
- To compare the peak and submaximal cardiorespiratory responses of common COPD field tests with a laboratory-based ramp cycle ergometer test (CET).
- Specifically, the study aimed to compare the 6-minute walk test (6MWT), incremental shuttle walk test (ISWT), and endurance shuttle walk test (ESWT) against the CET.
Main Methods:
- Twenty-four participants with COPD (FEV(1) 50 ± 14%) underwent four separate testing sessions.
- Sessions included the 6MWT, ISWT, ESWT, or CET, with standardized protocols.
- Cardiorespiratory responses, including heart rate and oxygen saturation (SpO2), were measured using a portable gas analysis unit.
Main Results:
- No significant differences were found in peak oxygen uptake, end-test heart rate, or tidal volume between the walking tests and the CET.
- The CET resulted in significantly higher peak carbon dioxide output, minute ventilation, and end-test SpO2 compared to all walking tests.
- Walking tests, both self-paced (6MWT) and externally paced (ISWT, ESWT), achieved high exercise intensities.
Conclusions:
- Field walking tests elicit comparable peak oxygen uptake and heart rate responses to a laboratory-based CET in individuals with moderate COPD.
- Both self-paced and externally paced walking tests are effective in progressing to high exercise intensities for COPD patients.
- These findings support the use of field walking tests as valid measures of exercise capacity in COPD management and rehabilitation.
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