The effect of lumbosacral manipulation on corticospinal and spinal reflex excitability on asymptomatic participants

Fryer, Gary and Pearce, Alan J 2012, The effect of lumbosacral manipulation on corticospinal and spinal reflex excitability on asymptomatic participants, Jouranl of manipulative and physiological therapeutics, vol. 35, no. 2, pp. 86-93, doi: 10.1016/j.jmpt.2011.09.010.

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Title The effect of lumbosacral manipulation on corticospinal and spinal reflex excitability on asymptomatic participants
Author(s) Fryer, Gary
Pearce, Alan J
Journal name Jouranl of manipulative and physiological therapeutics
Volume number 35
Issue number 2
Start page 86
End page 93
Total pages 8
Publisher Mosby
Place of publication Philadelphia, Pa.
Publication date 2012-02
ISSN 0161-4754
Keyword(s) manipulation
motor evoked potentials
Summary Objective The aim of the study was to examine the effects of a high-velocity, low-amplitude (HVLA) manipulation to the lumbosacral joint on corticospinal excitability, as measured by motor evoked potentials (MEPs) using transcranial magnetic stimulation, and spinal reflex excitability, as measured by the Hoffman reflex (H-reflex).

Methods In a randomized, controlled, crossover design, 14 asymptomatic volunteers (mean age, 23 ± 5.4 years; 10 men; 4 women) were measured for MEPs and H-reflexes immediately before and after a randomly allocated intervention. The interventions consisted of HVLA applied bilaterally to the lumbosacral joint and a control intervention. Participants returned a week later, and the same procedures were performed using the other intervention. Data for H-reflex and MEP amplitudes were normalized to the M-wave maximum amplitude and analyzed using 2-way analysis of variance with repeated measures.

Results A significant interaction of treatment by time was found for MEP (F1,13 = 4.87, P = .04), and post hoc analyses showed that the MEP/M-wave maximum ratio decreased significantly in the HVLA treatment (P = .02; effect size, 0.68). For H-reflex, there was a significant effect of time (F1,13 = 8.186, P = .01) and treatment and time interaction (F1,13 = 9.05, P = .01), with post hoc analyses showing that H-reflexes were significantly reduced after the HVLA manipulation (P = .004; effect size, 0.94). There were no significant changes in MEP latency or silent period duration.

Conclusion An HVLA manipulation applied to the lumbosacral joint produced a significant decrease in corticospinal and spinal reflex excitability, and no significant change occurred after the control intervention. The changes in H-reflexes were larger than those in MEPs, suggesting a greater degree of inhibition at the level of the spinal cord.
Language eng
DOI 10.1016/j.jmpt.2011.09.010
Field of Research 110903 Central Nervous System
Socio Economic Objective 920111 Nervous System and Disorders
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2012, National University of Health Sciences
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Document type: Journal Article
Collection: School of Psychology
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Created: Tue, 21 Aug 2012, 13:52:27 EST by Jane Moschetti

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