Age-related changes in prefrontal activity during walking in dual-task situations: A fNIRS study
Age-related changes in prefrontal activity during walking in dual-task situations: A fNIRS study
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DOI：
10.1016/j.ijpsycho.2014.03.005
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发表时间：
2014-06-01
影响因子：
3
通讯作者：
Bock, Otmar
中科院分区：
文献类型：
--
作者：
Beurskens, Rainer;Helmich, Ingo;Bock, Otmar
背景资料：以前的研究表明，人类的步态是控制下的高阶认知过程，位于额叶，这样的年龄相关的认知能力的退化有一个负面的影响gait.Methods：使用功能近红外光谱（fNIRS），我们调查的额皮质血流动力学相关的双任务行走在两种情况下。15名年轻人和10名老年人在跑步机上行走，同时完成视觉（检查）或语言记忆（字母回忆）要求的并发任务。我们比较了受试者的运动表现，以及他们在单任务和双任务walking.Results的前额叶活动：我们的行为数据部分证实了先前的帐户较高的双任务成本在步进参数（即，减少的步持续时间），特别是具有视觉任务和负的双重任务成本（即，在年轻人的口头任务中提高表现）。功能成像数据显示，年轻人从单任务到双任务行走的前额叶激活变化不大。然而，在老年人中，前额叶激活大幅下降，在双任务步行与一个复杂的visual task.Conclusion：我们解释这些研究结果的证据，从前额叶皮层的处理资源转移到其他大脑区域时，老年人面临的挑战，步行，同时执行一个视觉要求很高的任务。(C)2014爱思唯尔有限公司版权所有。
Background: Previous studies suggest that the human gait is under control of higher-order cognitive processes, located in the frontal lobes, such that an age-related degradation of cognitive capabilities has a negative impact on gait.Methods: Using functional Near-Infrared-Spectroscopy (fNIRS) we investigate the frontocortical hemodynamic correlates of dual-task walking in two conditions. 15 young and 10 older individuals walked on a treadmill while completing concurrent tasks that had either visual (checking) or verbal-memory (alphabet recall) demands. We compared subjects' motor performance, as well as their prefrontal activity in single- and dual-task walking.Results: Our behavioral data partly confirm previous accounts on higher dual-task costs in stepping parameters (i.e., decreased step duration) in old age, particularly with a visual task and negative dual-task cost (i.e., improved performance) during the verbal task in young adults. Functional imaging data revealed little change of prefrontal activation from single- to dual-task walking in young individuals. In the elderly, however, prefrontal activation substantially decreased during dual-task walking with a complex visual task.Conclusion: We interpret these findings as evidence for a shift of processing resources from the prefrontal cortex to other brain regions when seniors face the challenge of walking and concurrently executing a visually demanding task. (C) 2014 Elsevier B.V. All rights reserved.