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Variation of Neck Muscle Strength Along the Human Cervical Spine
Technical Paper
2004-22-0017
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English
Abstract
The aim of this study was to describe and explain the variation of neck muscle strength along the cervical spine. A three-dimensional model of the head-neck complex was developed to test the hypothesis that the moment-generating capacity of the neck musculature is lower in the upper cervical spine than in the lower cervical spine. The model calculations suggest that the neck muscles can protect the lower cervical spine from injury during extension and lateral bending. The maximum flexor moment developed in the lower cervical spine was 2 times higher than that developed in the upper spine. The model also predicted that the neck musculature is 30% stronger in the lower cervical spine during lateral bending. Peak compressive forces (up to 3 times body weight) were higher in the lower cervical spine. These results are consistent with the clinical finding that extension loading of the neck often leads to injuries in the upper cervical spine. Analysis of the model results showed that neck flexor strength was greater in the lower cervical spine because of the relatively large size of the sternocleidomastoid muscle. The hyoid muscles developed significant flexor moments about the joints of the upper cervical spine, as these muscles had relatively large flexor moment arms; however, this effect was offset by the action of the sternocleidomastoid, which exerted a large extensor moment in the upper spine. Lateral bending strength of the neck muscles was governed by geometry (i.e., moment arms) rather than by muscle size.
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Authors
- Nelson Oi - Department of Biomedical Engineering, University of Texas at Austin
- Marcus G. Pandy - Department of Biomedical Engineering, University of Texas at Austin
- Barry S. Myers - Department of Biomedical Engineering, Duke University, Durham, North Carolina
- Roger W. Nightingale - Department of Biomedical Engineering, Duke University, Durham, North Carolina
- Valeta Carol Chancey - Department of Biomedical Engineering, Duke University, Durham, North Carolina
Topic
Citation
Oi, N., Pandy, M., Myers, B., Nightingale, R. et al., "Variation of Neck Muscle Strength Along the Human Cervical Spine," SAE Technical Paper 2004-22-0017, 2004, https://doi.org/10.4271/2004-22-0017.Also In
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