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Pain effect on monosynaptic and polysynaptic reflex inhibition

A Leroux1, M Bélanger, J P Boucher

  • 1Department of Kinanthropology, University of Quebec at Montreal, Canada.

Archives of Physical Medicine and Rehabilitation
|June 1, 1995
PubMed
Summary
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Anterior knee pain, specifically patellofemoral dysfunction, does not alter monosynaptic reflexes but may increase nervous system excitability, affecting polysynaptic responses. Cold therapy provided pain relief but did not change reflex responses.

Area of Science:

  • Neuroscience
  • Physiology
  • Sports Medicine

Background:

  • Anterior knee pain, often associated with patellofemoral dysfunction (PFD), can significantly impact an individual's quality of life and physical function.
  • Electrophysiological assessments, including monosynaptic and polysynaptic reflexes, offer insights into the neural mechanisms underlying pain and motor control.
  • Understanding these neurophysiological changes is crucial for developing effective treatment strategies for PFD.

Purpose of the Study:

  • To investigate the electrophysiological effects of anterior knee pain on monosynaptic and polysynaptic reflexes.
  • To determine if cold application, used for pain relief, influences these reflex responses.
  • To compare reflex excitability between individuals with PFD and healthy controls.

Main Methods:

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  • A pretest/posttest experimental design with a control group was employed.
  • Participants included individuals with diagnosed PFD and healthy controls.
  • Monosynaptic (H-reflex) and polysynaptic (nociceptive flexion response - NFR) reflexes were measured before and after cold application to the knee.

Main Results:

  • Cold application significantly reduced pain (p < 0.05) but did not alter H-reflex amplitude in either group (p > 0.05).
  • The PFD group exhibited significantly lower pain and NFR thresholds compared to the control group (p < 0.05).
  • Nociceptive stimulation during isometric knee extension revealed greater inhibition in uni-articular extensors, particularly vastus medialis distal fibers, in the PFD group.

Conclusions:

  • Monosynaptic reflexes appear unaffected by pain episodes in anterior knee pain.
  • Differences in NFR thresholds suggest heightened nervous system excitability in individuals experiencing painful bouts, potentially contributing to PFD.
  • These findings highlight the complex interplay between pain, neural excitability, and reflex responses in anterior knee pain conditions.