Neural responses to the mechanical characteristics of high velocity, low amplitude spinal manipulation: Effect of specific contact site

Academic Article

Abstract

  • Background: Systematic investigations are needed identifying how variability in the biomechanical characteristics of spinal manipulation affects physiological responses. Such knowledge may inform future clinical practice and research study design. Objective: To determine how contact site for high velocity, low amplitude spinal manipulation (HVLA-SM) affects sensory input to the central nervous system. Design: HVLA-SM was applied to 4 specific anatomic locations using a no-HVLA-SM control at each location randomized in an 8. ×. 8 Latin square design in an animal model. Methods: Neural activity from muscle spindles in the multifidus and longissimus muscles were recorded from L dorsal rootlets in 16 anesthetized cats. A posterior to anterior HVLA-SM was applied through the intact skin overlying the L spinous process, lamina, inferior articular process and L spinous process. HVLA-SMs were preceded and followed by simulated spinal movement applied to the L vertebra. Change in mean instantaneous discharge frequency (δMIF) was determined during the thrust and the simulated spinal movement. Results: All contact sites increased L muscle spindle discharge during the thrust. Contact at all L sites significantly increased spindle discharge more than at the L site when recording at L . There were no differences between L contact sites. For simulated movement, the L contact sites but not the L contact site significantly decreased L spindle responses to a change in vertebral position but not to movement to that position. Conclusions: This animal study showed that contact site for an HVLA-SM can have a significant effect on the magnitude of sensory input arising from muscle spindles in the back. 6 6 7 6 6 6 7 6 6 6 7 6
  • Authors

    Published In

  • Manual Therapy  Journal
  • Digital Object Identifier (doi)

    Author List

  • Reed WR; Long CR; Kawchuk GN; Pickar JG
  • Start Page

  • 797
  • End Page

  • 804
  • Volume

  • 20
  • Issue

  • 6