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Related Experiment Videos

The ventilatory threshold: method, protocol, and evaluator agreement.

M Shimizu1, J Myers, N Buchanan

  • 1Cardiology Section, Long Beach Veterans Administration Medical Center, CA 90822.

American Heart Journal
|August 1, 1991
PubMed
Summary
This summary is machine-generated.

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Exercise protocols significantly impact oxygen uptake (VO2) measurements at the ventilatory threshold (ATge), with the V-slope method showing the most reliable results across different exercise tests and reviewers.

Area of Science:

  • Cardiopulmonary Exercise Testing
  • Exercise Physiology
  • Clinical Exercise Testing

Background:

  • Accurate determination of the ventilatory threshold (ATge) is crucial for assessing exercise capacity in individuals with and without heart disease.
  • Variability in ATge measurements can arise from differences in exercise protocols, detection methods, and observer interpretation.

Purpose of the Study:

  • To evaluate the influence of exercise modes, protocols, detection methods, and reviewers on oxygen uptake (VO2) measurements at the ATge.
  • To identify the most reliable method for determining ATge in clinical exercise testing.

Main Methods:

  • Seventeen men with heart disease and six healthy men performed six different exercise tests (three treadmill, three bicycle ergometer) in random order.
  • The ventilatory threshold (ATge) was determined using three common graphical methods: ventilatory equivalents, end-tidal gas pressures, and the V-slope method.

Related Experiment Videos

  • Three independent, blinded reviewers analyzed the data for each test and method.

    • Main Results:

    • Exercise protocol variations caused the largest variability in ATge measurements (up to 36% difference in VO2).
    • The V-slope method demonstrated consistent agreement among reviewers and was least affected by different exercise protocols.
    • Differences in protocol, method, and reviewer accounted for 82%, 14%, and 4% of the variance in ATge, respectively.

    Conclusions:

    • Exercise protocol is the primary source of variability in determining oxygen uptake at the ventilatory threshold.
    • The V-slope method offers a more reliable and reproducible approach for ATge determination compared to other methods.
    • Standardization of exercise protocols and utilization of the V-slope method are recommended for improved consistency in clinical exercise testing.