Investigation of the relationship between steps required to stop and propulsive force using simple walking models
Investigation of the relationship between steps required to stop and propulsive force using simple walking models
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DOI：
10.1016/j.jbiomech.2022.111071
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发表时间：
2022-04-01
影响因子：
2.4
通讯作者：
Hase, Kazunori
中科院分区：
文献类型：
--
作者：
Ohtsu, Hajime;Haraguchi, Naoto;Hase, Kazunori
为了预防老年人的福尔斯跌倒，有必要评估他们的步态稳定性，并找出负面影响它的因素，虽然其中一个可能的因素是步行推进力的减少，但力和步态稳定性之间的关系还没有完全澄清。为此，使用两个简单的行走模型来研究推进力和停止所需的步数（记为N）之间的关系。N被计算为无轮缘车轮停止所需的步数，并被视为一个变量，这是一个间接的稳定性指标。较低的N对应于步态更接近停止状态。在步进过渡期间，使用施加到最简单步行模型的推离脉冲计算推进力。考虑到人类行走中的双支撑阶段的影响，重力脉冲，这是身体重量（重力）在双支撑时间上的积分，被施加到模型的一步到一步的过渡方程。模型显示，推进力减少了两个因素：减少步长和减少步行速度。前者N增加，后者N减少。前者是与以前的实验结果一致的人的步态，而后者还没有实验研究。这些结果对阐明人体步态稳定性与推进力之间的关系具有重要意义。
To prevent falls in the elderly, it is essential to evaluate their gait stability and identify factors that negatively affect it. Although one of the probable factors is a decrease in propulsive force of walking, the relationship between the force and the gait stability has not been fully clarified. To this end, two simple walking models were used to investigate the relationship between the propulsive force and the number of steps required to stop, denoted N. N was calculated as the number of steps required for the rimless wheel to stop and was treated as a variable which is an indirect indicator of stability. A lower N corresponds to the gait being closer to a stopped state. The propulsive force was calculated using the push-off impulse applied to the simplest walking model during the step-to-step transition. To account for the effects of the double support phase in human walking, the gravitational impulse, which is the integral of the body weight (gravitational force) over the double support time, was applied to the step-to-step transition equation of the models. The models revealed that the propulsive force is reduced by two factors: the reduction in step length and the reduction in walking speed. In the former, N in-creases; in the latter, N decreases. The former is consistent with previous experimental results on human gait, whereas the latter has not been experimentally investigated. These results may provide important insights in clarifying the relationship between the stability and the propulsive force in human gait.