Oxygen consumption during corridor walk testing in chronic cardiac failure

Area of Science:

• Cardiology
• Exercise Physiology
• Rehabilitation Medicine

Background:

• Chronic cardiac failure significantly impairs functional capacity.
• Accurate assessment of functional capacity is crucial for managing heart failure.
• Maximal exercise testing can be resource-intensive.

Purpose of the Study:

• To evaluate the utility of the 6-minute corridor walk test for assessing functional capacity in chronic cardiac failure.
• To determine the reproducibility and validity of the corridor walk test.
• To explore its role as an adjunct to maximal exercise testing.

Main Methods:

• Sixteen patients with chronic cardiac failure performed three sequential 6-minute corridor walk tests.
• Oxygen consumption (VO2) was measured concurrently using a portable Oxylog device.
• Walk test variables were compared with previously determined peak VO2 and New York Heart Association (NYHA) classifications.

Main Results:

• Significant improvements in distance walked and highest VO2 were observed between the first and second tests.
• Excellent reproducibility was achieved between the second and third walk tests.
• Corridor walk test variables demonstrated good correlation with peak VO2 and adequately separated NYHA functional classes.

Conclusions:

• The 6-minute corridor walk test is a valuable tool for assessing functional capacity in chronic cardiac failure.
• The test exhibits good reproducibility and validity, even without direct VO2 measurement.
• Corridor walk testing serves as a practical adjunct to maximal exercise testing in clinical research and interventional studies.