Electromyographic and kinematic exploration of whiplash-type left anterolateral impacts

Journal of Spinal Disorders & Techniques
Shrawan KumarYogesh Narayan

Abstract

Volunteer studies of the cervical muscular response and head-neck kinematics in response to frontal impacts are uncommon. Moreover, the effect of a frontal impact offset to the left on the resultant muscle responses is unknown. The purpose of this study was to determine the response of the cervical muscles to increasing low-velocity frontal impacts offset by 45 degrees to the left and to compare the quantitative effects of expected and unexpected impact. Nine healthy volunteers were subjected to frontal impacts, offset by 45 degrees to the subject's left, of 5.0, 8.7, 11.3, and 15.6 m/s2 of acceleration at two levels of expectation: expected and unexpected. Bilateral electromyograms (EMGs) of the sternocleidomastoids, trapezii, and splenii capitis were recorded. Triaxial accelerometers recorded the acceleration of the chair, torso at the shoulder level, and head of the participant. Subjects tended to exhibit lower percentages of their maximal voluntary contraction EMG when the impact was expected. When the impact was unexpected, and at an acceleration of 15.6 m/s2, the splenius capitis muscle contralateral to the impact (ie, right splenius in a left anterolateral impact) generated 95% of its maximal voluntary contraction EMG, w...Continue Reading

References

Jan 24, 1998·Archives of Physical Medicine and Rehabilitation·J R BraultE J Brault
Jan 1, 1997·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·W H CastroK Wörtler
May 20, 1999·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·M L MagnussonD G Wilder
Feb 25, 2000·Accident; Analysis and Prevention·S KumarT Amell
Apr 5, 2002·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Shrawan KumarRobert Ferrari
May 11, 2002·Spine·Shrawan KumarTyler Amell
Sep 6, 2003·Clinical Biomechanics·Shrawan KumarTyler Amell

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Citations

Feb 8, 2006·Journal of Manipulative and Physiological Therapeutics·Shrawan KumarTroy Jones
Aug 13, 2005·Journal of Manipulative and Physiological Therapeutics·Shrawan KumarYogesh Narayan
Apr 15, 2005·American Journal of Physical Medicine & Rehabilitation·Shrawan KumarEdgar R Vieira
Nov 26, 2014·Spine·Jóna Marín ÓlafsdóttirGunter P Siegmund

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Shrawan KumarYogesh Narayan
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