An effective balancing response to lateral perturbations at pelvis level during slow walking requires control in all three planes of motion
An effective balancing response to lateral perturbations at pelvis level during slow walking requires control in all three planes of motion
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DOI：
10.1016/j.jbiomech.2017.06.020
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发表时间：
2017-07-26
影响因子：
2.4
通讯作者：
Olensek, Andrej
中科院分区：
文献类型：
--
作者：
Matjacic, Zlatko;Zadravec, Matjaz;Olensek, Andrej
在这项研究中，我们研究了平衡反应的横向扰动在缓慢行走（0.85米/秒）。一组7名健康人在装有仪器的跑步机上行走，同时在左脚跟向外和向内的横向方向上在腰部水平处受到扰动。测量重心（COM）、压力中心（COP）、骨盆绕垂直轴旋转、步长、步宽和步频。结果表明，在横向扰动开始后，除了控制横向COP外，适当的步长有利于控制矢状方向COP，减缓COM的运动。与未受干扰的行走相比，COM的SRL分量在向内（4.32 +/- 1.29 cm）和向外（9.75 +/- 2.17 cm）扰动下均显著延迟。这是必要的，因为在向内扰动第一步长度之后，（0.29 +/- 0.04 m，相比之下，无干扰行走时为0.52 +/- 0.02 m）和步行时间（0.45 +/- 0.05 s，相比之下，无扰动行走中的0.61 +/- 0.04 s）缩短，而在向外扰动后，前两个步长（0.36 +/- 0.05 m和0.32 +/- 0.11 m，相比之下，无干扰行走时为0.52 +/- 0.03 m）缩短，需要通过矢状面中COP的所述调节进行调节。此外，骨盆明显的旋转有助于将摆动腿带到新的位置。这项研究的结果表明，抵消在缓慢行走的横向扰动需要在所有三个平面的运动有足够的反应。(C)2017爱思唯尔有限公司版权所有
In this study we investigated balancing responses to lateral perturbations during slow walking (0.85 m/s). A group of seven healthy individuals walked on an instrumented treadmill while being perturbed at the level of waist at left heel strike in outward and inward lateral directions. Centre of mass (COM) and centre of pressure (COP), rotation of pelvis around vertical axis, step lengths, step widths and step times were assessed. The results have shown that beside control of COP in lateral direction, facilitated by adequate step widths, control of COP in sagittal direction, slowing down movement of COM was present after commencement of lateral perturbations. Sagittal component of COM was significantly retarded as compared to unperturbed walking for both inward (4.32 +/- 1.29 cm) and outward (9.75 +/- 2.17 cm) perturbations. This was necessary since after an inward perturbation first step length (0.29 +/- 0.04 m compared to 0.52 +/- 0.02 m in unperturbed walking) and step time (0.45 +/- 0.05 s compared to 0.61 +/- 0.04 s in unperturbed walking) were shortened while after an outward perturbation first two step lengths (0.36 +/- 0.05 m and 0.32 +/- 0.11 m compared to 0.52 +/- 0.03 m in unperturbed walking) were shortened that needed to be accommodated by the described modulation of COP in sagittal plane. In addition pronounced pelvis rotation assisted in bringing swing leg to new location. The results of this study show that counteracting lateral perturbations at slow walking requires adequate response in all three planes of motion. (C) 2017 Elsevier Ltd. All rights reserved.