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首页> 外文期刊>Journal of Biomechanics >Simultaneous Postural Adjustments (SPA) scrutinized using the Lissajous method
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Simultaneous Postural Adjustments (SPA) scrutinized using the Lissajous method

机译：使用Lissajous方法仔细检查同时姿势调整（SPA）

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The goal of this research was to study the postural adjustments that occur during the course of a voluntary movement (Simultaneous Postural Adjustments: SPA). A pointing task performed at maximal velocity was considered and upper limb kinematics and body kinetics were recorded. A 2-DOF model was elaborated that distinguishes between the body segments that are mobilized in order to perform the pointing movement. These segments are the right upper limb (termed the "focal" component) and the rest of the body (termed the "postural" component). This model allowed for the calculation of both subsystems' kinetics and a comparison of the resultant reaction (RoSh) with the corresponding action (AoSh) at the shoulder level. The analysis was based on the ellipsoidal shape of their relationship. The ellipse computation ("Lissajous ellipse") allowed the time lag to be estimated. The results showed that the kinetics of the postural component preceded that of the focal ones and that the time lag during the SPA was not statistically different from the APA duration (dAPA). In addition, the kinetics of the postural component were found to be opposed to the perturbation induced by the pointing movement, but only during part of the SPA time interval. It was concluded that the postural component plays a dual role during the movement, which consists of postural stabilization and propulsive action, with one prevailing over the other depending on the time-instant of movement evolution. This new evidence in healthy subjects is helpful to further specify differences associated with motor impairments. (C) 2014 Elsevier Ltd. All rights reserved.
机译：这项研究的目的是研究在自愿运动过程中发生的姿势调整（同时姿势调整：SPA）。考虑以最大速度执行的指向任务，并记录上肢运动学和身体动力学。精心设计了一种2-DOF模型，该模型可以区分为了执行指向运动而动员的身体部分。这些部分是右上肢（称为“焦点”部分）和身体的其余部分（称为“姿势”部分）。该模型可以计算两个子系统的动力学，并可以在肩部水平比较反应结果（RoSh）和相应的作用（AoSh）。分析基于它们之间的椭圆关系。椭圆计算（“李沙育椭圆”）可以估计时间滞后。结果表明，姿势成分的动力学先于局部成分的动力学，SPA期间的时滞与APA持续时间（dAPA）在统计学上没有差异。此外，发现姿势部分的动力学与指向运动引起的扰动相反，但仅在SPA时间间隔的一部分时间内。结论是，姿势成分在运动过程中起着双重作用，它由姿势稳定和推进作用组成，其中一个取决于运动演变的时间，而另一个则占主导。健康受试者的这一新证据有助于进一步明确与运动障碍相关的差异。 （C）2014 Elsevier Ltd.保留所有权利。

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