Lee Jihye, Park Seungha
Department of Kinesiology and Sports Studies, Ewha Womans University, Seoul, Korea.
J Exerc Rehabil. 2018 Dec 27;14(6):993-997. doi: 10.12965/jer.1836402.201. eCollection 2018 Dec.
The purpose of this study to investigate how gait velocity and variability were affected by dual task prioritization in older adults with normal cognitive function and older adults with mild cognitive impairment (MCI). Eight older adults with MCI and eight cognitively normal older adults performed a walking task under usual walking with no dual task (usual gait), walk while counting backward from 100 by ones with no priority on task (no priority), walk and count while instructed to prioritize gait task (gait priority), and walk and count while instructed to prioritize the cognitive task (cognitive priority). The MCI group showed significantly slower walking speed than the normal group in the no priority condition, but no difference between both group in the usual gait condition, and they almost 3 times greater gait variability in the no priority condition than the normal group. For the effect of priority instructions, MCI group showed a dual-task cost to gait velocity almost 2 times higher than that of the normal group in the no priority condition, but the cost was almost three times higher in both gait and cognitive priority conditions. Although there was no interaction effect for gait variability, MCI group tended to be more influenced by dual task prioritization than the normal group. Our findings confirmed that the priority-based dual task paradigm is a valid way to assess gait characteristics of people with cognitive problems.
本研究旨在调查双重任务优先级如何影响认知功能正常的老年人和轻度认知障碍（MCI）老年人的步态速度和变异性。八名患有MCI的老年人和八名认知正常的老年人在无双重任务的正常行走（正常步态）、倒着从100开始逐个计数且对任务无优先级要求（无优先级）、在被指示优先考虑步态任务时行走并计数（步态优先）以及在被指示优先考虑认知任务时行走并计数（认知优先）的情况下执行行走任务。MCI组在无优先级条件下的行走速度明显慢于正常组，但在正常步态条件下两组之间无差异，且在无优先级条件下其步态变异性几乎是正常组的3倍。对于优先级指示的影响，MCI组在无优先级条件下对步态速度的双重任务成本几乎是正常组的2倍，但在步态和认知优先条件下成本几乎高出3倍。尽管步态变异性没有交互作用效应，但MCI组比正常组更容易受到双重任务优先级的影响。我们的研究结果证实，基于优先级的双重任务范式是评估认知问题患者步态特征的有效方法。
