Wajda Douglas A, Roeing Kathleen L, McAuley Edward, Motl Robert W, Sosnoff Jacob J
a Department of Kinesiology and Community Health , University of Illinois at Urbana-Champaign.
J Mot Behav. 2016;48(1):66-71. doi: 10.1080/00222895.2015.1040110. Epub 2015 May 19.
Gait and cognitive impairments are compounded when performed simultaneously in individuals with multiple sclerosis (MS), and this is termed cognitive-motor interference (CMI). The authors examined whether CMI is related to balance confidence in individuals with MS. They hypothesized that individuals with low balance confidence would exhibit greater CMI possibly indicating a behavioral modification during dual task conditions. Thirty-four individuals with MS completed Activity-specific Balance Confidence (ABC) scale and a cognitive assessment as well as single and dual task walking trials at a comfortable pace. CMI was calculated as the percent change in walking velocity and cognitive task performance from single- to dual-task conditions and termed dual-task cost (DTC). A correlation analysis was performed to determine the relationships between DTCs of gait and cognitive performance and ABC scores. The correlation analysis revealed no significant association between ABC and DTC of walking velocity (p > .05). A significant relationship between balance confidence and DTCs of cognition was observed. The observed relationships suggest individuals with MS tend to alter their cognitive performance rather than manipulating their gait when confronted with a dual task. Overall, the findings partially support a behavioral explanation of CMI in individuals with MS.
对于患有多发性硬化症（MS）的个体而言，步态和认知障碍在同时出现时会相互加剧，这被称为认知运动干扰（CMI）。作者研究了CMI是否与MS患者的平衡信心有关。他们假设平衡信心低的个体表现出更大的CMI，这可能表明在双重任务条件下行为发生了改变。34名MS患者以舒适的步伐完成了特定活动平衡信心（ABC）量表、认知评估以及单任务和双任务步行试验。CMI计算为从单任务到双任务条件下步行速度和认知任务表现的百分比变化，并称为双任务成本（DTC）。进行了相关性分析以确定步态和认知表现的DTC与ABC分数之间的关系。相关性分析显示ABC与步行速度的DTC之间无显著关联（p>.05）。观察到平衡信心与认知的DTC之间存在显著关系。观察到的关系表明，MS患者在面对双重任务时倾向于改变其认知表现而非操控其步态。总体而言，研究结果部分支持了对MS患者CMI的行为学解释。
