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首页> 外文期刊>Journal of Biomechanics >Inverse dynamic investigation of voluntary leg lateral movements in weightlessness: a new microgravity-specific strategy
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Inverse dynamic investigation of voluntary leg lateral movements in weightlessness: a new microgravity-specific strategy

机译：失重中自愿腿部横向运动的逆动态研究：一种新的微重力特定策略

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This study deals with the quantitative assessment of exchanged forces and torques at the restraint point during whole body posture perturbation movements in long-term microgravity. The work was based on the results of a previous study focused on trunk bending protocol, which suggested that the minimization of the torques exchanged at the restraint point could be a strategy for movement planning in microgravity (J. Biomech. 36(11) (2003) 1691). Torques minimization would lead to the optimization of muscles activity, to the minimization of energy expenditure and, ultimately, to higher movement control capabilities. Here, we focus on leg lateral abduction from anchored stance. The analysis was based on inverse dynamic modelling, leading to the estimation of the total angular momentum at the supporting ankle joint. Results agree with those obtained for trunk bending movements and point out a consistent minimization of the torques exchanged at the restraint point in weightlessness. Given the kinematic features of the examined motor task, this strategy was interpreted as a way to master the rotational dynamic effects on the frontal plane produced by leg lateral abduction. This postural stabilizing effects was the result of a multi-segmental compensation strategy, consisting of the counter rotation of the supporting limb and trunk accompanying the leg raising. The observed consistency of movement-posture co-ordination patterns among lateral leg raising and trunk bending is put forward as a novel interpretative issue of the adaptation mechanisms of the motor system to sustained microgravity, especially if one considers the completely different kinematics of the centre of mass, which was observed in weightlessness for these two motor tasks. (c) 2004 Elsevier Ltd. All rights reserved.
机译：这项研究涉及定量评估长期微重力下全身姿势扰动运动中约束点处的交换力和扭矩。这项工作基于先前针对躯干弯曲协议的研究结果，该研究表明在约束点交换最小的扭矩可能是微重力运动计划的一种策略（J. Biomech。36（11）（2003。 ）（1691）。扭矩最小化将导致肌肉活动的优化，能量消耗的最小化，并最终导致更高的运动控制能力。在这里，我们主要关注固定姿势下的腿外侧外展。该分析基于逆动力学建模，从而可以估算支撑踝关节处的总角动量。结果与躯干弯曲运动获得的结果一致，并指出了在失重约束点处交换的扭矩始终保持最小。考虑到所检查的运动任务的运动学特征，该策略被解释为一种控制腿外侧外展对前平面产生旋转动力影响的方法。这种姿势稳定效果是多段补偿策略的结果，该策略包括支撑腿和躯干随腿抬高而反向旋转。提出了在侧腿抬高和躯干弯曲之间观察到的运动姿势协调模式的一致性，作为对运动系统对持续微重力的适应机制的一种新颖的解释性问题，特别是如果考虑到运动中心的运动学完全不同的话质量，这是在这两项运动任务的失重状态下观察到的。 （c）2004 Elsevier Ltd.保留所有权利。

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