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Co-contraction of cervical muscles during sagittal and coronal neck motions at different movement speeds

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Abstract

Muscle co-contraction is important in stabilizing the spine. The effects of movement speed and direction on the cervical co-contraction were, however, not yet investigated. Surface electromyographies of three paired cervical muscles were measured in 17 young healthy subjects. The subjects performed voluntary neck movements in sagittal and coronal plane at fast, medium, and slow speeds. The co-contraction ratio was defined as the normalized integration of antagonistic electromyographic activities divided by that of total muscle activities. The results showed that the co-contraction ratio at fast speed (0.42 ± 0.21) was smaller than that at medium (0.45 ± 0.20) and slow (0.46 ± 0.19) speeds (P ≤ 0.001). The co-contraction ratio was different between flexion and extension, but was similar between left and right lateral bending. The implications of co-contraction patterns include: (1) agonistic activities increase with speed but antagonistic activities do not increase accordingly; (2) neck extensors are highly activated during sagittal motions; and (3) muscular activations are symmetric during coronal motions. In conclusion, the co-contraction patterns from young healthy subjects demonstrate normal neuromuscular control in regulating the stiffness of cervical spine, and may further be references to assess the neck disorders in elderly or patients.

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Abbreviations

SCM:

Sternocleidomastoid; flex and laterally flex the neck

SPL:

Splenius capitis; extend and laterally flex the neck

SSC:

Semispinalis capitis; extend and laterally flex the neck

LLB:

Left lateral bending; from right end to left end position

RLB:

Right lateral bending; from left end to right end position

NAIEMG:

Normalized average integration of electromyographic activity

CCR:

Co-contraction ratio

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Acknowledgments

Funding of this research was partially supported by the National Science Council, Taiwan (NSC 94-2320-B-002-035) and National Health Research Institute, Taiwan (NHRI-EX95-9425EI). We appreciate the technical support from the Consulting Center for Statistics and Bioinformatics, NTU. Suggestions and advices from Dr. Shwu-Fen Wang, Dr. Jer-Junn Luh, and physiotherapist Ya-wen Kuo were also highly appreciated.

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Authors and Affiliations

  1. Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, #1, Sec 1, Jen-Ai Road, Taipei, 10016, Taiwan, Republic of China

    Chih-Hsiu Cheng & Jaw-Lin Wang

  2. School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan, Republic of China

    Kwan-Hwa Lin

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  1. Chih-Hsiu Cheng
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  2. Kwan-Hwa Lin
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Correspondence to Jaw-Lin Wang.

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Cheng, CH., Lin, KH. & Wang, JL. Co-contraction of cervical muscles during sagittal and coronal neck motions at different movement speeds. Eur J Appl Physiol 103, 647–654 (2008). https://doi.org/10.1007/s00421-008-0760-4

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