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Summary
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This study assessed the reliability of vascular function tests. Most measures showed good repeatability and reproducibility, but laser Doppler imaging had variable results, requiring careful consideration in research.

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Area of Science:

  • Cardiovascular Physiology
  • Non-invasive Vascular Assessment

Background:

  • Reliability of non-invasive vascular function measures in single sessions is not well-established.
  • Understanding test-retest reliability is crucial for accurate research and clinical applications.

Purpose of the Study:

  • To determine the test-retest reliability (repeatability and reproducibility) of a battery of non-invasive vascular function measures.
  • To evaluate the consistency of measurements taken within and between testing sessions.

Main Methods:

  • Utilized a test battery including automated blood pressure (BP), laser Doppler imaging with iontophoresis (LDI), digital volume pulse (DVP), pulse wave velocity (PWV), pulse wave analysis (PWA), and flow-mediated dilation (FMD).
  • Measurements were taken in 21 non-smoking males intra-session and again one week apart (inter-session).
  • Statistical analysis included intraclass correlation coefficients (ICC) and coefficient of variation (CV).

Main Results:

  • Moderate to excellent repeatability and reproducibility were found for BP, DVP stiffness index, PWV, augmentation index (AIx), AIx normalized to heart rate, and absolute/percentage FMD (ICC: 0.53-0.96).
  • DVP reflection index showed moderate repeatability but poor reproducibility (ICC: 0.17).
  • Laser Doppler imaging (LDI) measures exhibited poor to good repeatability and reproducibility (ICC: 0.31-0.84) with high variability (CV: 28.4-36.7%).

Conclusions:

  • Most non-invasive vascular function measures demonstrate acceptable to excellent test-retest reliability.
  • Laser Doppler imaging (LDI) presents significant variability, necessitating cautious interpretation and study design.
  • Variability in measurements of endothelial function and arterial stiffness requires careful consideration in future research.