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Related Experiment Videos

Randomized reliability study evaluating constant-load and graded-exercise treadmill test for intermittent

M Cachovan1, W Rogatti, F Woltering

  • 1Division of Angiology, Herz-Kreislauf-Klinik Bevensen, Germany.

Angiology
|March 24, 1999
PubMed
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The constant-load (C-test) and graded-exercise (G-test) treadmill tests demonstrate comparable reliability for assessing claudication distance in patients. Both methods offer reproducible results for initial and absolute claudication distances.

Area of Science:

  • Vascular Medicine
  • Exercise Physiology
  • Clinical Diagnostics

Background:

  • Intermittent claudication, a symptom of peripheral artery disease, impacts patient mobility.
  • Standardized treadmill testing is crucial for evaluating exercise capacity and disease progression.
  • Different protocols exist globally, necessitating comparative reliability studies.

Purpose of the Study:

  • To compare the reliability of the German constant-load treadmill test (C-test) versus the US-propagated graded-exercise test (G-test).
  • To assess reproducibility of initial claudication distance (ICD) and absolute claudication distance (ACD) between the two protocols.

Main Methods:

  • A randomized crossover study involving 50 patients with peripheral artery disease.
  • Patients underwent both C-test (3 km/hr, 12% fixed grade) and G-test (3 km/hr, 3.5% grade increase every 3 min) on the same day.

Related Experiment Videos

  • Tests were repeated over 3 days within one week to assess within-subject and between-subject variation.

    • Main Results:

    • High intraclass correlations for ICD (0.88 C-test, 0.87 G-test) and ACD (0.91 for both).
    • Similar within-subject coefficients of variation for ICD (25% C-test, 27% G-test) and ACD (24% C-test, 21% G-test).
    • C-test showed significantly lower coefficients of variation than G-test for shorter ACDs (<100m and 100-150m).

    Conclusions:

    • Both the C-test and G-test exhibit comparable and high reliability for assessing claudication distances.
    • The C-test may offer superior precision for patients with very limited absolute claudication distances.
    • Findings support the use of either test for reproducible assessment in clinical practice.