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Related Experiment Videos

Multiple session experimental pain measurement

D Yarnitsky1, E Sprecher, R Zaslansky

  • 1Department of Neurology and Clinical Neurophysiology, Rambam Medical Center, Haifa, Israel.

Pain
|October 1, 1996
PubMed
Summary
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Heat pain thresholds show bias in early sessions, suggesting later sessions for baseline. The Visual Analog Scale (VAS) demonstrates poor repeatability in experimental settings.

Area of Science:

  • Pain perception research
  • Psychophysics
  • Experimental psychology

Background:

  • Heat pain thresholds (HP) and Visual Analog Scales (VAS) are used to measure pain.
  • Previous studies indicated inter-session bias in HP thresholds due to practice effects.
  • The repeatability of VAS for experimental pain assessment has not been rigorously evaluated.

Purpose of the Study:

  • To evaluate the repeatability and bias of heat pain (HP) thresholds and Visual Analog Scale (VAS) measurements over four weekly sessions.
  • To determine the reliability of HP thresholds and VAS for pain assessment in individuals over time.
  • To question the utility of VAS in experimental and clinical pain assessment.

Main Methods:

  • 30 healthy volunteers participated in four weekly experimental sessions.

Related Experiment Videos

  • Heat pain transients were administered to measure HP threshold and suprathreshold magnitude estimation via VAS.
  • Stimuli were set at 1.5, 3, and 4.5°C above individual HP thresholds.

    • Main Results:

    • HP thresholds exhibited bias between the first and subsequent sessions, but not among later sessions.
    • Single-session HP thresholds were found to be of limited value for individual pain assessment.
    • VAS demonstrated poor inter-session repeatability, with confidence intervals of 7.6-9.4 on a 10-point scale.

    Conclusions:

    • HP thresholds should be interpreted cautiously from single sessions; use the second or later session as baseline for long-term studies.
    • The repeatability of VAS in experimental settings is questionable, impacting its utility for precise pain measurement.
    • Further testing is needed to assess VAS reliability in clinical settings for individual patient assessments.