Foot displacement but not velocity predicts the outcome of a slip induced in young subjects while walking
Foot displacement but not velocity predicts the outcome of a slip induced in young subjects while walking
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DOI：
10.1016/s0021-9290(00)00037-3
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发表时间：
2000-07-01
影响因子：
2.4
通讯作者：
Grabiner, MD
中科院分区：
文献类型：
--
作者：
Brady, RA;Pavol, MJ;Grabiner, MD
本研究的目的是在健康受试者中诱导滑倒，作为一种手段，以确定在滑倒脚的位移和速度分别超过普遍接受的10 cm和50 cm/s的限制的条件下，是否有可能从诱导的滑倒中恢复，并确定是否有步态相关的变量使个体在滑倒后容易跌倒。33名年轻的赤脚成年人，由仪表安全带保护，在一系列不受干扰的步行试验后进行了一次滑倒试验。当赤脚接触涂有矿物油的乙烯基片材时，引起滑动。下肢运动学采集使用基于视频的运动捕捉系统。分别有14例和12例受试者明确归类为跌倒或恢复。四个变量表现出显著的组间差异，两个变量用于使用逻辑回归计算滑倒结果的概率。变量是脚的位移在滑动和小腿相对于地面的角度在地面接触的瞬间就在滑动之前。使用每个变量的单独单变量logistic回归是显著的，并且正确分类了约70%的滑倒结果。结果表明，先前公布的值的位移和速度的滑动脚，10厘米和50厘米/秒，分别，可能无法准确地代表上限，超过恢复是不可能的。结果还表明，脚跟着地角，反映步幅，施加一个显着的影响结果的一个滑。(C)2000爱思唯尔科技有限公司版权所有。
The purpose of the present study was to induce slips in healthy subjects as a means to determine if recovery from an induced slip is possible under conditions in which the displacements and velocities of the slipping foot exceed the generally accepted limits of 10 cm and 50 cm/s, respectively, and to determine if there are gait-related variables that predispose an individual to falling after a slip. Thirty-three young and barefoot adults, protected by an instrumented safety harness, were subjected to a single slipping trial following a series of unperturbed walking trials. The slip was induced when the bare foot contacted a vinyl sheet coated with mineral oil. Lower extremity kinematics were acquired using a video-based motion capture system. Fourteen and 12 subjects could be unambiguously categorized as having fallen or recovered, respectively. Four variables demonstrated significant between-group differences and two were used to compute the probability of the slip outcome using logistic regression. The variables were the displacement of the foot during the slip and the angle of the shank relative to the ground at the instant of ground contact just prior to the slip. Separate univariate logistic regressions using each variable were significant and correctly classified about 70% of the slip outcomes. The results demonstrated that previously published values for the displacement and velocity of the slipping foot, 10 cm and 50 cm/s, respectively, may not accurately represent the upper limits beyond which recovery is not possible. The results also demonstrated that heel-strike angle, reflective of stride length, exerts a significant influence on the outcome of a slip. (C) 2000 Elsevier Science Ltd. All rights reserved.