Effects of external loads on balance control during upright stance: experimental results and model-based predictions.
Effects of external loads on balance control during upright stance: experimental results and model-based predictions.
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直立站立期间外部负载对平衡控制的影响：实验结果和基于模型的预测。
DOI：
10.1016/j.gaitpost.2008.05.014
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发表时间：
2009
期刊：
影响因子：
2.4
通讯作者：
Nussbaum,MauryA
中科院分区：
文献类型：
--
作者：
Qu,Xingda;Nussbaum,MauryA
本研究的目的是确定直立站立时外部负载对平衡控制的影响，并检查新的平衡控制模型预测这些影响的能力。对 12 名年轻、健康的参与者施加外部负荷，并通过基于压力中心 (COP) 的测量来表征对平衡控制的影响。研究了几种负载条件，包括负载质量（个人体重的 10% 和 20%）和高度（高于全身 COM 的身高或 15%）的组合。基于最优控制策略的平衡控制模型被用来预测COP时间序列。假设给定的个体在不同的外部负载条件下会采用相同的神经最优控制机制，在空载条件下确定。随着外部载荷的施加，前后方向的 COP 平均速度和内外方向的 RMS 距离分别增加了 8.1% 和 10.4%。预测的 COP 平均速度和前后方向的 RMS 距离也随着外部载荷的增加而分别增加 11.1% 和 2.9%。实验性 COP 数据和基于模型的预测都提供了相同的一般结论，即应用较大的外部负载和优于全身质心的负载会导致姿势控制效果较差，并且可能会增加失去平衡或跌倒的风险。因此，可以得出结论，关于控制机制一致性的假设得到了部分支持，并且主要影响平衡控制的是外部负载引起的机械变化。
The purpose of this study was to identify the effects of external loads on balance control during upright stance, and to examine the ability of a new balance control model to predict these effects. External loads were applied to 12 young, healthy participants, and effects on balance control were characterized by center-of-pressure (COP) based measures. Several loading conditions were studied, involving combinations of load mass (10% and 20% of individual body mass) and height (at or 15% of stature above the whole-body COM). A balance control model based on an optimal control strategy was used to predict COP time series. It was assumed that a given individual would adopt the same neural optimal control mechanisms, identified in a no-load condition, under diverse external loading conditions. With the application of external loads, COP mean velocity in the anterior–posterior direction and RMS distance in the medial–lateral direction increased 8.1% and 10.4%, respectively. Predicted COP mean velocity and RMS distance in the anterior–posterior direction also increased with external loading, by 11.1% and 2.9%, respectively. Both experimental COP data and model-based predictions provided the same general conclusion, that application of larger external loads and loads more superior to the whole body center of mass lead to less effective postural control and perhaps a greater risk of loss of balance or falls. Thus, it can be concluded that the assumption about consistency in control mechanisms was partially supported, and it is the mechanical changes induced by external loads that primarily affect balance control.
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影响因子：
2.4
作者：
Qu,Xingda;Nussbaum,MauryA;Madigan,MichaelL
通讯作者：
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DOI：
--
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