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evaluation des proprietes mecaniques des muscles cervicaux : analyse du comportement dynamique du segment tete-cou lors de l'application de detentes rapides

Abstract : Evaluation of the cervical muscles mechanical properties: analysis of the dynamical behaviour of the head-neck segment through application of quick releases. Head stabilization is a capital task: it determines corporal balance, sensitive information processing, and protection of the central nervous system. It is greatly determined by the mechanical properties of cervical muscles which were never investigated, in our knowledge, on multi-linked corporal segments. In addition, quick-release method elaborated in order to assess musculo-tendinous stiffness of joints was never applied on multi-joints corporal segments. The aims of this study are to adapt quick-release method on the head-neck segment in order to its musculo-tendinous stiffness, to model the head-neck segment as a single-joint corporal segment, and to investigate the effects of fatigue located on cervical muscles on the head-neck segment musculo-tendinous stiffness. Kinematics analysis of the head during quick-releases with an accelerometer shows a positive and reproducible relationship between angular displacement and exertion level. Results do not show any relationship between head-neck segment musculo-tendinous stiffness and exertion level. Kinematics analysis of the head-neck segment through an optimization procedure shows a significant increase of the head-neck musculo-tendinous stiffness and exertion level. Results show also that geometrical changes generated by structural specificities of the head-neck segment were partly responsible on increase of head-neck segment musculo-tendinous stiffness according to exertion level. Optimization procedure used here shows that fatigue generated on cervical muscles did not produce significant changes on head-neck musculo-tendinous stiffness. Results obtained in these works shows that quick-release perturbations, associated to a model of the head-neck segment as a single-joint system, seems to provide a reliable evaluation of the head-neck segment musculo-tendinous stiffness.
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Submitted on : Tuesday, November 8, 2011 - 5:39:29 PM
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  • HAL Id : tel-00639328, version 1

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Raphael Portero. evaluation des proprietes mecaniques des muscles cervicaux : analyse du comportement dynamique du segment tete-cou lors de l'application de detentes rapides. Biomécanique [physics.med-ph]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨tel-00639328⟩

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