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Jendrassik maneuver effect on spinal and brainstem reflexes.

Lale Aslihan Ertuglu1, Asli Aydin1, Hatice Kumru2,3,4

  • 1Koç University School of Medicine, Istanbul, Turkey.

Experimental Brain Research
|October 26, 2019
PubMed
Summary

The Jendrassik Maneuver (JM) influences neural pathways beyond direct muscle activation. This study reveals JM affects both spinal and brainstem reflexes, indicating widespread neural modulation.

Keywords:
Brainstem reflexesJendrassik maneuverMonosynapticPolysynaptic reflexesTendon reflex

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Motor Control

Background:

  • The Jendrassik Maneuver (JM) is known to modulate monosynaptic reflexes below the contraction site.
  • Its influence on other reflex pathways, both near and far, remains less understood.

Purpose of the Study:

  • To investigate the widespread effects of the JM on polysynaptic reflexes.
  • To determine if JM influences reflexes both caudal and rostral to the maneuver.

Main Methods:

  • Assessed soleus tendon reflex, withdrawal reflexes (tibialis anterior, soleus), and blink reflexes (BR).
  • Measured blink reflex excitability recovery (BR-ER) and prepulse inhibition (PPI) of the BR.
  • Stimulated supraorbital nerve for blink reflex assessment.

Main Results:

  • Soleus tendon reflex amplitude increased during JM, decreasing post-JM.
  • No significant changes were observed in withdrawal reflexes.
  • Blink reflex R2 area decreased post-JM, while BR prepulse inhibition decreased during JM.
  • Blink reflex excitability recovery remained unchanged.

Conclusions:

  • The JM exerts generalized effects on neural excitability at both caudal and rostral levels.
  • JM demonstrates a selective impact on the excitability of specific reflex circuits.