Impact of aging on visual reweighting during locomotion
Impact of aging on visual reweighting during locomotion
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DOI：
10.1016/j.clinph.2011.11.081
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发表时间：
2012-07-01
影响因子：
4.7
通讯作者：
Lamontagne, Anouk
中科院分区：
文献类型：
--
作者：
Berard, Jessica;Fung, Joyce;Lamontagne, Anouk
目的：本研究的目的是调查年轻和老年受试者在正常和快速行走时重新衡量视觉线索的能力。方法：要求10名年轻人（23.49 +/- 4.72）和10名老年人（76.22 +/- 3.11）在无视觉干扰、空白（无视觉输入）和视觉干扰三种情况下，在头戴式显示器（HMD）单元中观看虚拟场景时身体直走。受试者以两种速度完成任务：首选的自我速度和快速速度。计算的变量包括轨迹、航向角和体段方向。结果：在摄动条件下，老年人行走时分割度较高，身体重心偏离较多。只有年轻受试者受到步行速度的影响，步行速度越快，表现越好。结论：老年会影响视觉信息的重新加权能力以及实时调整姿势或运动的能力。年轻人在快速条件下的较低误差表明，随着速度的增加，大脑皮层对运动的控制减弱。意义：实时呈现的视觉信息会影响老年人的平衡和活动能力，因此在评估和干预时应予以认真考虑。(C) 2011年国际临床神经生理学联合会。爱思唯尔爱尔兰有限公司出版。版权所有。
Objectives: The purpose of this study was to investigate the ability of young and old subjects to reweight visual cues while walking at normal and fast speeds.Methods: Ten young (23.49 +/- 4.72) and ten older adults (age 76.22 +/- 3.11) were asked to physically walk straight while viewing a virtual scene in a head-mounted display (HMD) unit under three conditions: no visual perturbation, blank (no visual input), and visual perturbation. Subjects performed the tasks walking at two speeds: preferred self-pace and fast. Variables calculated included trajectory, heading angle, and body segment orientations.Results: In the perturbation condition, the older adults walked with higher segmentation and more deviations of the body's centre of mass. Only the young subjects were affected by the walking speed, with an improved performance when walking fast.Conclusions: Old age affects the ability to re-weight visual information and make postural or locomotor adjustments in real time. The lower errors of the young adults in the fast conditions suggest decreased cortical control of locomotion with increasing speeds.Significance: Visual information presented in real time can impact on balance and mobility in older adults, and thus should be given serious consideration for the purpose of evaluation and intervention. (C) 2011 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.