Document Detail


Spinal manipulation force and duration affect vertebral movement and neuromuscular responses.
MedLine Citation:
PMID:  16378668     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Previous study in human subjects has documented biomechanical and neurophysiological responses to impulsive spinal manipulative thrusts, but very little is known about the neuromechanical effects of varying thrust force-time profiles. METHODS: Ten adolescent Merino sheep were anesthetized and posteroanterior mechanical thrusts were applied to the L3 spinous process using a computer-controlled, mechanical testing apparatus. Three variable pulse durations (10, 100, 200 ms, force = 80 N) and three variable force amplitudes (20, 40, 60 N, pulse duration = 100 ms) were examined for their effect on lumbar motion response (L3 displacement, L1, L2 acceleration) and normalized multifidus electromyographic response (L3, L4) using a repeated measures analysis of variance. FINDINGS: Increasing L3 posteroanterior force amplitude resulted in a fourfold linear increase in L3 posteroanterior vertebral displacement (p < 0.001) and adjacent segment (L1, L2) posteroanterior acceleration response (p < 0.001). L3 displacement was linearly correlated (p < 0.001) to the acceleration response over the 20-80 N force range (100 ms). At constant force, 10 ms thrusts resulted in nearly fivefold lower L3 displacements and significantly increased segmental (L2) acceleration responses compared to the 100 ms (19%, p = 0.005) and 200 ms (16%, p = 0.023) thrusts. Normalized electromyographic responses increased linearly with increasing force amplitude at higher amplitudes and were appreciably affected by mechanical excitation pulse duration. INTERPRETATION: Changes in the biomechanical and neuromuscular response of the ovine lumbar spine were observed in response to changes in the force-time characteristics of the spinal manipulative thrusts and may be an underlying mechanism in related clinical outcomes.
Authors:
Christopher J Colloca; Tony S Keller; Deed E Harrison; Robert J Moore; Robert Gunzburg; Donald D Harrison
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-12-27
Journal Detail:
Title:  Clinical biomechanics (Bristol, Avon)     Volume:  21     ISSN:  0268-0033     ISO Abbreviation:  Clin Biomech (Bristol, Avon)     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-01-31     Completed Date:  2006-03-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8611877     Medline TA:  Clin Biomech (Bristol, Avon)     Country:  England    
Other Details:
Languages:  eng     Pagination:  254-62     Citation Subset:  IM    
Affiliation:
Biomechanics Laboratory, Exercise and Sport Research Institute, Department of Kinesiology, Arizona State University, Tempe, AZ, USA. cjcolloca@neuromechanical.com
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MeSH Terms
Descriptor/Qualifier:
Animals
Elasticity
Lumbar Vertebrae / physiology*
Manipulation, Spinal / methods*
Movement / physiology*
Muscle Contraction / physiology
Muscle, Skeletal / physiology*
Physical Stimulation / methods*
Range of Motion, Articular / physiology*
Reflex / physiology
Sheep
Stress, Mechanical
Weight-Bearing / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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