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Analysis of right anterolateral impacts: the effect of head rotation on the cervical muscle whiplash response

BACKGROUND: The cervical muscles are considered a potential site of whiplash injury, and there are many impact scenarios for whiplash injury. There is a need to understand the cervical muscle response under non-conventional whiplash impact scenarios, including variable head position and impact direc...

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Autores principales: Kumar, Shrawan, Ferrari, Robert, Narayan, Yogesh
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2005
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1156933/
https://www.ncbi.nlm.nih.gov/pubmed/15927056
http://dx.doi.org/10.1186/1743-0003-2-11
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author Kumar, Shrawan
Ferrari, Robert
Narayan, Yogesh
author_facet Kumar, Shrawan
Ferrari, Robert
Narayan, Yogesh
author_sort Kumar, Shrawan
collection PubMed
description BACKGROUND: The cervical muscles are considered a potential site of whiplash injury, and there are many impact scenarios for whiplash injury. There is a need to understand the cervical muscle response under non-conventional whiplash impact scenarios, including variable head position and impact direction. METHODS: Twenty healthy volunteers underwent right anterolateral impacts of 4.0, 7.6, 10.7, and 13.0 m/s(2 )peak acceleration, each with the head rotated to the left, then the head rotated to the right in a random order of impact severities. Bilateral electromyograms of the sternocleidomastoids, trapezii, and splenii capitis following impact were measured. RESULTS: At a peak acceleration of 13.0 m/s(2), with the head rotated to the right, the right trapezius generated 61% of its maximal voluntary contraction electromyogram (MVC EMG), while all other muscles generated 31% or less of this variable (31% for the left trapezius, 13% for the right spleinus. capitis, and 16% for the left splenius capitis). The sternocleidomastoids muscles also tended to show an asymmetric EMG response, with the left sternocleidomastoid (the one responsible for head rotation to the right) generating a higher percentage (26%) of its MVC EMG than the left sternocleidomastoid (4%) (p < 0.05). When the head is rotated to the left, under these same conditions, the results are reversed even though the impact direction remains right anterolateral. CONCLUSION: The EMG response to a right anterolateral impact is highly dependent on the head position. The sternocleidomastoid responsible for the direction of head rotation and the trapezius ipsilateral to the direction of head rotation generate the most EMG activity.
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spelling pubmed-11569332005-06-22 Analysis of right anterolateral impacts: the effect of head rotation on the cervical muscle whiplash response Kumar, Shrawan Ferrari, Robert Narayan, Yogesh J Neuroengineering Rehabil Research BACKGROUND: The cervical muscles are considered a potential site of whiplash injury, and there are many impact scenarios for whiplash injury. There is a need to understand the cervical muscle response under non-conventional whiplash impact scenarios, including variable head position and impact direction. METHODS: Twenty healthy volunteers underwent right anterolateral impacts of 4.0, 7.6, 10.7, and 13.0 m/s(2 )peak acceleration, each with the head rotated to the left, then the head rotated to the right in a random order of impact severities. Bilateral electromyograms of the sternocleidomastoids, trapezii, and splenii capitis following impact were measured. RESULTS: At a peak acceleration of 13.0 m/s(2), with the head rotated to the right, the right trapezius generated 61% of its maximal voluntary contraction electromyogram (MVC EMG), while all other muscles generated 31% or less of this variable (31% for the left trapezius, 13% for the right spleinus. capitis, and 16% for the left splenius capitis). The sternocleidomastoids muscles also tended to show an asymmetric EMG response, with the left sternocleidomastoid (the one responsible for head rotation to the right) generating a higher percentage (26%) of its MVC EMG than the left sternocleidomastoid (4%) (p < 0.05). When the head is rotated to the left, under these same conditions, the results are reversed even though the impact direction remains right anterolateral. CONCLUSION: The EMG response to a right anterolateral impact is highly dependent on the head position. The sternocleidomastoid responsible for the direction of head rotation and the trapezius ipsilateral to the direction of head rotation generate the most EMG activity. BioMed Central 2005-05-31 /pmc/articles/PMC1156933/ /pubmed/15927056 http://dx.doi.org/10.1186/1743-0003-2-11 Text en Copyright © 2005 Kumar et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Kumar, Shrawan
Ferrari, Robert
Narayan, Yogesh
Analysis of right anterolateral impacts: the effect of head rotation on the cervical muscle whiplash response
title Analysis of right anterolateral impacts: the effect of head rotation on the cervical muscle whiplash response
title_full Analysis of right anterolateral impacts: the effect of head rotation on the cervical muscle whiplash response
title_fullStr Analysis of right anterolateral impacts: the effect of head rotation on the cervical muscle whiplash response
title_full_unstemmed Analysis of right anterolateral impacts: the effect of head rotation on the cervical muscle whiplash response
title_short Analysis of right anterolateral impacts: the effect of head rotation on the cervical muscle whiplash response
title_sort analysis of right anterolateral impacts: the effect of head rotation on the cervical muscle whiplash response
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1156933/
https://www.ncbi.nlm.nih.gov/pubmed/15927056
http://dx.doi.org/10.1186/1743-0003-2-11
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