Dynamic head-neck stabilization and modulation with perturbation bandwidth investigated using a multisegment neuromuscular model

JOURNAL OF BIOMECHANICS

卷:58

Article

Happee, Riender¹  de Bruijn, Edo¹  Forbes, Patrick A.^1,3  van der Helm, Frans C. T.^1,2 

[1] Delft Univ Technol, Dept Biomech Engn, Delft, Netherlands

[2] Univ Twente, Lab Biomech Engn, Enschede, Netherlands

[3] Erasmus MC, Dept Neurosci, Rotterdam, Netherlands

关键词: Postural control;    Musculoskeletal model;    Neck;    Feedback;    Vestibular;    VCR;    CCR;    Co-contraction;   

DOI  :  10.1016/j.jbiomech.2017.05.005

来源: Elsevier

【 摘 要 】

The human head-neck system requires continuous stabilization in the presence of gravity and trunk motion. We investigated contributions of the vestibulocollic reflex (VCR), the cervicocollic reflex (CCR), and neck muscle co-contraction to head-in-space and head-on-trunk stabilization, and investigated modulation of the stabilization strategy with the frequency content of trunk perturbations and the presence of visual feedback. We developed a multisegment cervical spine model where reflex gains (VCR and CCR) and neck muscle co-contraction were estimated by fitting the model to the response of young healthy subjects, seated and exposed to anterior-posterior trunk motion, with frequency content from 0.3 up to 1, 2, 4 and 8 Hz, with and without visual feedback. The VCR contributed to head-in-space stabilization with a strong reduction of head rotation (< 8 Hz) and a moderate reduction of head translation (> 1 Hz). The CCR contributed to head-on-trunk stabilization with a reduction of head rotation and head translation relative to the trunk (< 2 Hz). The CCR also proved essential to stabilize the individual intervertebral joints and prevent neck buckling. Co-contraction was estimated to be of minor relevance. Control strategies employed during low bandwidth perturbations most effectively reduced head rotation and head relative displacement up to 3 Hz while control strategies employed during high bandwidth perturbations reduced head global translation between 1 and 4 Hz. This indicates a shift from minimizing head-on-trunk rotation and translation during low bandwidth perturbations to minimizing head-in-space translation during high bandwidth perturbations. Presence of visual feedback had limited effects suggesting increased usage of vestibular feedback. (C) 2017 The Author(s). Published by Elsevier Ltd.

【 授权许可】

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