Cervical muscle response to right posterolateral impacts

Clinical Biomechanics
Shrawan KumarYogesh Narayan

Abstract

To test the hypothesis that the head kinematic and the cervical muscle EMG responses to unexpected impacts of increasing low-velocity in the posterolateral direction will be greater than to expected impacts. Ten healthy volunteers were subjected to right posterolateral of 5.0, 8.6, 12.2, and 15.4 m/s2 acceleration in expected and unexpected conditions. The effect of a posterolateral impact on the cervical muscle responses is unknown. Bilateral EMG of the sternocleidomastoids, trapezii, and splenii capitis were recorded and compared. The acceleration of the chair, torso, and head was recorded and compared. At an acceleration of 15.4 m/s2, the sternocleidomastoids generated the highest EMG in the unexpected impact conditions with lower percentages for the expected impact (50% of their maximal voluntary contraction). The splenii exhibited between 30% and 40% EMG, the trapezii generated approximately 25%. The EMG was significantly affected by the levels of acceleration (P < 0.01) for the sternocleidomastoids and splenii. The time to onset and peak EMG for all muscles progressively decreased with increasing levels of acceleration and regressed significantly on it (P < 0.01). Head accelerations were greater in the unexpected impacts ...Continue Reading

References

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

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Citations

Sep 1, 2005·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·Ivonne A HernándezPaul W Major
Jan 25, 2011·Traffic Injury Prevention·Jarrod A J ShuggJames P Dickey
Oct 12, 2004·Clinical Biomechanics·Shrawan KumarYogesh Narayan
Apr 6, 2017·Physiotherapy Theory and Practice·Michael T CibulkaCourtney Dolles
Feb 8, 2006·Journal of Manipulative and Physiological Therapeutics·Shrawan KumarTroy Jones
Nov 26, 2014·Spine·Jóna Marín ÓlafsdóttirGunter P Siegmund

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