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Terminal H-reflex Measurements in Mice
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Psychophysical or spinal reflex measures when assessing conditioned pain modulation?

Marie Udnesseter Lie1,2, Elena Petriu3,4, Dagfinn Matre5

  • 1Research and Communication Unit for Musculoskeletal Health (FORMI), Oslo University Hospital, Oslo, Norway.

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Conditioning pain modulation (CPM) is more pronounced with thermal stimuli than electrical stimuli. However, both methods show poor reliability for clinical use due to high variability.

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Area of Science:

  • Neuroscience
  • Pain Research
  • Physiology

Background:

  • Conditioning Pain Modulation (CPM) assessment can utilize objective spinal reflex measures or subjective psychophysical measures.
  • Spinal reflex measures may offer more objective and stable CPM effect assessments than psychophysical methods.

Purpose of the Study:

  • To compare the CPM effect and its test-retest reliability between a psychophysical protocol using thermal stimuli and a spinal reflex protocol using electrical stimuli.

Main Methods:

  • Twenty-five healthy volunteers underwent two identical experimental sessions separated by at least one week.
  • Thermal test-stimulus involved 120s of heat stimulation with pain intensity ratings; electrical test-stimulus involved 120s of electrical stimulation eliciting a nociceptive withdrawal reflex.
  • A 7°C water bath served as the conditioning stimulus; differences in CPM effect and reliability were analyzed using ANOVA and reliability indices.

Main Results:

  • A significantly larger CPM effect was observed with the thermal test-stimulus (-46%) compared to the electrical test-stimulus (4.5%) (p < 0.001).
  • Intraclass correlation coefficients were 0.5 for the electrical and 0.4 for the thermal test-stimulus, indicating fair relative reliability.
  • Both protocols exhibited wide limits of agreement, suggesting poor absolute reliability due to high intraindividual variability.

Conclusions:

  • The CPM effect is more pronounced when assessing pain perception via psychophysical methods (thermal stimulus) than nociception at the spinal level (electrical stimulus).
  • Both investigated CPM protocols demonstrate fair relative reliability but poor absolute reliability, limiting their clinical utility for individual decision-making.
  • Further research is recommended before implementing these CPM protocols in clinical practice due to their insufficient intrarater reliability.