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首页> 外文期刊>Journal of Biomechanics >Computation of trunk stability in forward perturbations-Effects of preload, perturbation load, initial flexion and abdominal preactivation
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Computation of trunk stability in forward perturbations-Effects of preload, perturbation load, initial flexion and abdominal preactivation

机译：前向摄动中躯干稳定性的计算-预负荷，摄动负荷，初始屈曲和腹部预激活的影响

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Spine stability demand influences active-passive coordination of the trunk response, especially during sudden perturbations. The objective of this study was to look at the role of passive, stationary active and reflexive subsystems on spinal stability. Spine stability was evaluated here during pre- and post-perturbation phases by computing the minimum (i.e., critical) muscle stiffness coefficient required to maintain stability. The effects of pre-perturbation conditions (preloading, initial posture and abdominal antagonistic coactivation) as well as perturbation magnitude were studied. Results revealed that higher preload, initially flexed trunk posture and abdominal pre-activation enhanced pre-perturbation stiffness and stability. In contrast to the preload, however, larger sudden load, initial flexion and abdominal preactivation significantly increased post-perturbation stability margin. As a result, much lower critical muscle stiffness coefficient was required post-perturbation. Compared to the pre-perturbation phase, the trunk stiffness and stability substantially increased post-perturbation demanding thus a much lower critical muscle stiffness coefficient. Overall, these findings highlight the crucial role of the ligamentous spine and muscles (in both passive and active states) in augmenting the trunk stiffness and hence stability during pre- and post-perturbation phases; a role much evident in the presence of initial trunk flexion. (C) 2015 Elsevier Ltd. All rights reserved.
机译：脊柱稳定性需求会影响躯干反应的主动-被动协调，特别是在突然的扰动期间。这项研究的目的是研究被动，固定主动和反射子系统对脊柱稳定性的作用。在此之前和之后的摄动阶段，通过计算维持稳定性所需的最小（即临界）肌肉僵硬系数来评估脊柱的稳定性。研究了预摄动条件（预紧力，初始姿势和腹部拮抗共激活）以及摄动幅度的影响。结果显示，较高的预紧力，最初弯曲的躯干姿势和腹部预激活可增强预摄动的刚度和稳定性。与预负荷相反，较大的突然负荷，初始屈曲和腹部预激活显着增加了摄动后的稳定性余量。结果，摄动后需要低得多的临界肌肉刚度系数。与摄动前阶段相比，躯干的刚度和稳定性大大提高了摄动后的要求，因此临界肌肉的刚度系数要低得多。总体而言，这些发现突出了韧带脊柱和肌肉（在被动和主动状态下）在增加躯干刚度以及因此在摄动前后阶段的稳定性方面的关键作用;在最初的躯干弯曲中，这一作用非常明显。 （C）2015 Elsevier Ltd.保留所有权利。

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