Medio-lateral motion of the center of mass during obstacle crossing distinguishes elderly individuals with imbalance
Medio-lateral motion of the center of mass during obstacle crossing distinguishes elderly individuals with imbalance
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DOI：
10.1016/s0966-6362(02)00067-x
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发表时间：
2003-12-01
期刊：
影响因子：
2.4
通讯作者：
Brey, RH
中科院分区：
文献类型：
--
作者：
Chou, LS;Kaufman, KR;Brey, RH
本研究旨在探讨是否可以通过比较在跨越障碍物过程中的中-外侧（M-L）方向上的全身质心（COM）运动来区分患有不平衡的老年患者和健康老年受试者。招募了9名健康的老年人和6名在行走过程中主诉“头晕”或“不稳定”的老年患者（3名患有双侧/单侧前庭无力，3名诊断不明确），以进行通畅的水平行走和穿越障碍物，障碍物设置为每个受试者身高的2.5%、5%、10%和15%。使用13节段生物力学模型的加权和平均值计算COM的运动。在所有测试条件下，时间-距离步态参数无显著组间差异。然而，老年患者的平衡障碍表现出显着更大和更快的横向运动的COM时，跨越障碍。这些测量值将失衡的老年患者与健康的老年受试者区分开来。此外，增加的M-L运动的COM在跨越障碍显示出正相关性增加的M-L运动范围的摆动脚轨迹。M-L运动的这种增加表明摆动脚轨迹的补偿性调整，以将摆动脚降落在适当的位置，这将建立新的支撑基础以对抗额状面中的平衡干扰。(C)2003 Elsevier Science B. V.保留所有权利。
This study was performed to investigate whether elderly patients with imbalance can be distinguished from healthy elderly subjects by comparing their whole body center of mass (COM) motion in the medio-lateral (M-L) direction during obstacle crossing. Nine healthy elderly adults and six elderly patients having complaints of 'dizziness' or 'unsteadiness' during walking (three with bilateral/unilateral vestibular weakness and three with unclear diagnosis) were recruited to perform unobstructed level walking and crossing of obstacles set to 2.5, 5, 10 and 15% of each subject's height. Kinematics of the COM was calculated using a weighted sum average of a 13-segment biomechanical model. There were no significant group differences for the temporal-distance gait parameters during all testing conditions. However, elderly patients with balance disorders demonstrated significantly greater and faster lateral motion of the COM when crossing over obstacles. These measurements distinguish elderly patients with imbalance from healthy elderly subjects. Furthermore, the increased M-L motion of the COM during obstacle crossing showed a positive correlation with an increased M-L range of motion of the swing foot trajectory. This increase in M-L motion indicates a compensatory adjustment in the swing foot trajectory to land the swing foot at an appropriate location that would establish a new base of support to counter the balance disturbance in the frontal plane. (C) 2003 Elsevier Science B.V. All rights reserved.