Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 23426
Title Instantaneous rate of loading during manual high-velocity, low-amplitude spinal manipulations
URL http://www.ncbi.nlm.nih.gov/pubmed/24928638
Journal J Manipulative Physiol Ther. 2014 Jun;37(5):294-299
Author(s)
Subject(s)
Peer Review Yes
Publication Type Article
Abstract/Notes

Objective: The objective of this study was to determine the instantaneous rate of loading during manual high-velocity, low-amplitude spinal manipulations (HVLA SMs) in the lumbar and thoracic regions and compare to the average rates of loading.

Methods: Force-time profiles were recorded using a hand force transducer placed between the hand of a doctor of chiropractic and the subject’s back during 14 HVLA SM thrusts on asymptomatic volunteers while 3 doctors of chiropractic delivered the spinal manipulations. Doctors also delivered 36 posterior to anterior thoracic manipulations on a mannequin. Data were collected at a sampling rate of 1000 Hz using Motion Monitor software. Force-time profile data were differentiated to obtain instantaneous rates of loading. The data were reduced using a custom-written MathCad program and analyzed descriptively.

Results: The instantaneous rates of loading were 1.7 to 1.8 times higher than average rates of loading, and instantaneous rates of unloading were 2.1 to 2.6 times the average rates of unloading during HVLA SMs. Maximum instantaneous rates of loading occurred 102 to 111 milliseconds prior to peak load. Maximum instantaneous rates of unloading occurred 121 to 154 milliseconds after the peak load. These data may be useful for further understanding of HVLA SMs.

Conclusions: The instantaneous rates of loading and where they occurred may be useful data for understanding and describing HVLA SMs.

This abstract is reproduced with the permission of the publisher; full text is available by subscription. Click on the above link and select a publisher from PubMed’s LinkOut feature.


 

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