Toe clearance variability during walking in young and elderly men
Toe clearance variability during walking in young and elderly men
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DOI：
10.1016/j.gaitpost.2007.10.006
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发表时间：
2008-07-01
期刊：
影响因子：
2.4
通讯作者：
Morrison, Steven
中科院分区：
文献类型：
--
作者：
Mills, Peter M.;Barrett, Rod S.;Morrison, Steven
行走时跌倒是老年人受伤和死亡的主要原因。从跌倒的角度来看，一个关键的步态事件是最小的脚趾间隙（MTC），因为没有达到脚-地间隙会导致绊倒和潜在的跌倒。MTC表现出跨步间的可变性，必须将其最小化，以避免脚尖与地面接触事件的发生。从10名年轻人和9名老年人在跑步机上连续行走1000步中获得步态运动学。摆趾被建模为21自由度运动链的端点。比较青年和老年人MTC的集中趋势和分散、MTC发生时的站立足角、站立和摆动腿关节角（time(MTC)）。关节角度变异性和MTC变异性之间的关系也在两个年龄组中进行了研究。中位MTC未发现与年龄相关的差异，但受试者内MTC的变异性在老年人中大于年轻人。与年轻人相比，老年人在timeMTC时表现出更少的站立性髋关节伸展，更大的摆动性髋关节屈曲和更少的站立性髋关节内收。没有发现与年龄相关的立场、脚或关节角度变异的差异。MTC变异性与年轻人的摆动踝关节跖背屈曲变异性和老年人的站立踝关节内收外展变异性相关性最强。总之，老年男性比年轻男性表现出更大的MTC变异性，在没有与年龄相关的中位数MTC增加的情况下，这可能会增加老年人绊倒的风险。(C) 2007 Elsevier B.V.版权所有
Falls during walking are a major cause of injury and death in the elderly. From a falls perspective, a critical gait event is minimum toe clearance (MTC), as failure to achieve foot-ground clearance results in a trip and potentially a fall. MTC exhibits stride-to-stride variability, which must be minimised to avoid the occurrence of toe-ground contact events. Gait kinematics were acquired from 10 young and nine elderly men for 1000 sequential strides during treadmill walking. The swing toe was modelled as the endpoint of a 21 degree-of-freedom kinematic chain. Central tendency and dispersion of MTC, stance foot angles and stance and swing leg joint angles at the time of MTC (time(MTC)) were compared between the young and elderly. The relationship between joint angle variability and MTC variability was also examined in both age groups. No age-related differences in median MTC were identified, however within-subject variability of MTC was greater for the elderly than the young. The elderly also displayed less stance hip extension, greater swing hip flexion and less stance hip adduction at timeMTC than the young. No age-related differences in stance foot or joint angle variability were identified. MTC variability was most strongly correlated with swing ankle plantar-dorsiflexion variability for the young group and stance ankle adduction-abduction variability for the elderly. In conclusion, elderly men exhibit greater MTC variability than young men, which in the absence of an age-related increase in median MTC, may increase the risk of tripping in the elderly. (C) 2007 Elsevier B.V. All rights reserved.