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Changes in H-reflex and V-waves following spinal manipulation.

Imran Khan Niazi1, Kemal S Türker, Stanley Flavel

  • 1Centre for Chiropractic Research, New Zealand College of Chiropractic, 6 Harrison Rd Mt Wellington, Newmarket, PO Box 113-044, Auckland, New Zealand.

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Summary

Spinal manipulation enhances muscle strength and alters neural pathways, increasing cortical drive and motor unit excitability. This intervention also appears to prevent fatigue during maximal contractions.

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Spinal manipulation is a common therapeutic intervention.
  • Its effects on neural plasticity, including cortical drive and reflex pathways, require further elucidation.
  • Understanding these mechanisms can optimize treatment strategies.

Purpose of the Study:

  • To investigate the neural plastic changes following spinal manipulation.
  • To examine the involvement of the H-reflex pathway and cortical drive.
  • To assess the impact on muscle strength and fatigue resistance.

Main Methods:

  • Ten subjects underwent spinal manipulation or a control intervention.
  • Soleus V-wave, H-reflex, and M-wave recruitment curves were recorded.
  • Maximum voluntary contraction (MVC) and surface electromyography (SEMG) signals were analyzed.

Main Results:

  • Spinal manipulation significantly increased MVC (59.5%) and force (16.05%).
  • The V/M max ratio increased by 44.97%, and H-reflex threshold decreased.
  • Control intervention led to decreased MVC (-13.31%), force (-11.35%), and V/M max ratio (-23.45%).

Conclusions:

  • The H-reflex pathway is implicated in neural plasticity after spinal manipulation.
  • Increased cortical drive and afferent modulation contribute to improved MVC.
  • Spinal manipulation enhances motor unit excitability and mitigates fatigue during maximal efforts.