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首页> 外文期刊>Journal of Biomechanics >Influence of an asymmetrical body weight distribution on the control of undisturbed upright stance
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Influence of an asymmetrical body weight distribution on the control of undisturbed upright stance

机译：体重分布不对称对直立姿势控制的影响

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Postural asymmetry in humans is generally associated with different pathologies. However, its specific influence on undisturbed upright stance is poorly understood. To evaluate its separate effects on each support, the centre of pressure (CP) displacements were recorded through two force platforms. In a second step, the complex resultant centre of pressure trajectories (CPRes) were computed and decomposed into two elementary components: the horizontal displacements of the centre of gravity (CG(h)) and the difference in the plane of support between the vertical projection of CG(h), and CPRes, (CP-CG(v)) These motions were then processed through a frequency analysis and modelled as fractional Brownian motion to gain some additional insight into their spatio-temporal organisation. Ten healthy adults were tested in three conditions consisting of various weight distributions. The quality of the mechanism involved in the control of the unloaded support CP motions appears to decrease as the asymmetry becomes more pronounced. To be precise, larger increases of the CP displacements are observed for the unloaded support compared to the loaded one. As a result, the CPRes motions are themselves augmented in the ML direction, inducing in turn larger CG(h), and CP-CG(y) motions. Postural asymmetry thus constitutes an important constraint on the control of upright undisturbed stance by generating changes in the control of both supports and by reducing the efficiency of the hip load/unload mechanisms. On the other hand, by inducing larger body sways, postural asymmetry necessitates higher energy expenditure and the setting of particular control mechanisms. (c) 2004 Elsevier Ltd. All rights reserved.
机译：人的姿势不对称通常与不同的病理学有关。但是，人们对它对直立姿势的特定影响了解甚少。为了评估其对每个支撑的单独影响，通过两个受力平台记录了压力中心（CP）的位移。第二步，计算复杂的压力轨迹合成中心（CPRes），并将其分解为两个基本成分：重心的水平位移（CG（h））和垂直投影之间的支撑平面差异CG（h）和CPRes（CP-CG（v）），然后通过频率分析处理这些运动，并将其建模为分数布朗运动，以进一步了解其时空组织。在由各种体重分布组成的三种条件下对十名健康成年人进行了测试。随着不对称性变得更加明显，参与控制空载的支撑CP运动的机构的质量似乎下降。确切地说，与已加载的支撑相比，未加载的支撑的CP位移观察到更大的增加。结果，CPRes运动本身在ML方向上增强了，从而又引起了更大的CG（h）和CP-CG（y）运动。因此，姿势不对称通过在两个支撑件的控制中产生变化并通过降低髋部加载/卸载机制的效率，构成了对直立不受干扰姿势的控制的重要约束。另一方面，通过引起更大的身体摇摆，姿势的不对称需要更高的能量消耗和特定控制机制的设置。 （c）2004 Elsevier Ltd.保留所有权利。

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