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Related Experiment Videos

Do joint receptors modulate the motoneuron excitability?

M A Sabbahi1, A M Fox, C Druffle

  • 1Texas Woman's University, School of Physical Therapy, Houston 77030.

Electromyography and Clinical Neurophysiology
|November 1, 1990
PubMed
Summary

Anesthesia of ankle joint receptors reduced movement sensation but did not affect alpha-motoneuron excitability, suggesting joint receptors are less crucial for position sense than previously thought.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Biomechanics

Background:

  • Joint receptors are sensory receptors located in joints that provide information about joint position and movement.
  • Their role in kinesthetic sensation and motor control is not fully understood.
  • Understanding their function is crucial for fields like rehabilitation and sports science.

Purpose of the Study:

  • To investigate the effect of joint receptor afferent discharge on kinesthetic sensation and alpha-motoneuron excitability in the ankle joint.
  • To determine if joint receptors contribute to position sense during rest and movement.
  • To assess the impact of joint receptor input on motor neuron excitability.

Main Methods:

  • Passive ankle movements and kinesthetic tests (delay time, visual analog scale) were used to assess sensation.
  • Soleus H-M recruitment and H-reflex recovery curves measured alpha-motoneuron excitability.
  • Joint receptors were desensitized using iontophoretic xylocaine application.
  • Tests were conducted before, during, and after receptor desensitization.

Main Results:

  • Movement kinesthesia was significantly decreased following joint receptor anesthesia (p < 0.05).
  • This decrease in sensation persisted throughout the experimental period.
  • No significant changes were observed in H-M recruitment or H-reflex recovery curves, indicating unchanged alpha-motoneuron excitability.

Conclusions:

  • Joint receptor afferents may not contribute significantly to ankle position sense during rest.
  • These afferents may play a role in sensing movement within a specific range.
  • The contribution of joint receptors to central nervous system motor control, as measured by H-reflexes, appears minimal.

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