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A task-relevant experimental pain model to target motor adaptation.

Alessio Gallina1,2, Jacques Abboud1,3, Jean-Sébastien Blouin1,4,5

  • 1School of Kinesiology, University of British Columbia, Vancouver, Canada.

The Journal of Physiology
|February 27, 2021
PubMed
Summary

Researchers developed a new experimental pain model to study how motor adaptation limits pain. This model allows for task-relevant pain modulation, showing a strong link between perceived pain and movement adjustments.

Keywords:
EMGadaptationelectrical stimulationkneepain

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Pain Research

Background:

  • Motor adaptation is theorized to be a pain-avoidance mechanism.
  • Existing experimental pain models lack the ability to modulate pain intensity based on movement or posture.
  • This limits the direct testing of pain adaptation theories.

Purpose of the Study:

  • To develop and validate a novel experimental pain model.
  • To investigate the relationship between perceived pain and motor adaptation.
  • To enable direct experimental testing of pain adaptation theories in a controlled setting.

Main Methods:

  • Developed a pain model using low-frequency sinusoidal electrical stimuli on the infrapatellar fat pad.
  • Modulated stimulus amplitude based on participants' leg force during upright standing.
  • Recorded electromyographic (EMG) signals to assess stimulation artefacts.

Main Results:

  • Low-frequency sinusoidal stimuli (4 Hz) showed minimal pain habituation and EMG artefacts over 60 seconds.
  • Modulated pain intensity was strongly correlated with applied leg force (R² = 0.65).
  • The model successfully replicated task-relevant pain modulation, mimicking clinical musculoskeletal pain.

Conclusions:

  • The novel pain model provides a reliable method for inducing sustained, modulated experimental pain.
  • It allows for the quantification of neuromuscular responses during painful stimulation.
  • This facilitates direct testing of the link between motor adaptation strategies and pain perception.