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The 6-min walk test in heart failure: is it a max or sub-maximum exercise test?
Melissa Jehn1, Martin Halle, Tibor Schuster
1Klinikum Rechts der Isar, Technische Universität München, Germany. jehn@sport.med.tum.de
European Journal of Applied Physiology
|July 21, 2009
Summary
The 6-minute walk test (6MWT) cardiorespiratory response varies with heart failure severity. While a good overall correlate, 6MWT is maximal in advanced heart failure but sub-maximal in mild cases, impacting exercise capacity assessments.
Area of Science:
- Cardiology
- Exercise Physiology
- Pulmonary Rehabilitation
Background:
- The 6-minute walk test (6MWT) is widely used to assess exercise capacity in heart failure (HF).
- Cardiopulmonary exercise testing (CPET) provides a more comprehensive measure of cardiorespiratory function.
- Understanding the relationship between 6MWT and CPET is crucial for accurate HF patient assessment.
Purpose of the Study:
- To compare the cardiorespiratory response during the 6MWT and symptom-limited CPET in heart failure patients.
- To evaluate how varying degrees of heart failure influence the relationship between 6MWT and CPET outcomes.
Main Methods:
- Thirty-seven patients with New York Heart Association class I-III heart failure participated.
- Patients completed both a 6MWT and a cycle ergometer CPET.
- Respiratory gases were analyzed, and patients were stratified into tertiles based on CPET VO2peak.
Main Results:
- A significant overall correlation was found between 6MWT VO2 and CPET VO2peak (r=0.72, P<0.001).
- Patients with mild HF (highest VO2peak tertile) showed lower 6MWT VO2 compared to CPET VO2peak.
- Patients with advanced HF (lowest VO2peak tertile) exhibited higher 6MWT VO2 compared to CPET VO2peak.
Conclusions:
- The 6MWT's utility in assessing heart failure exercise capacity is dependent on the patient's functional impairment level.
- In advanced HF, 6MWT approximates maximal exercise response; in mild HF, it is sub-maximal.
- Consideration of functional status is vital when interpreting 6MWT results for epidemiological studies, therapy outcomes, and prognosis in heart failure.
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