University of Illinois at Urbana-Champaign, Department of Kinesiology and Community Health, 301 Freer Hall, 906 South Goodwin Ave, Urbana, IL 61801, United States.
University of Illinois at Urbana-Champaign, Department of Kinesiology and Community Health, 301 Freer Hall, 906 South Goodwin Ave, Urbana, IL 61801, United States.
Gait Posture. 2014 Jul;40(3):352-6. doi: 10.1016/j.gaitpost.2014.04.209. Epub 2014 May 9.
Cognitive and balance dysfunction are common symptoms in individuals with multiple sclerosis (MS). Although traditionally seen as separate impairments, performing a concurrent cognitive task while maintaining an upright posture results in individuals with MS increasing their postural sway (i.e. dual task cost (DTC) of balance). However, the factors relating to this phenomenon are not clear. This investigation examined the demographic, clinical and cognitive correlates of DTC of balance in individuals with MS. Sixty-two persons with MS completed both quiet standing and dual task balance trials on a force platform. Additionally, they provided demographic information and performed clinical tests of balance, spasticity, fall risk and cognitive processing speed. Dual task cost was calculated as the percentage change in sway area from the baseline to dual task force platform conditions. Overall, there were no significant correlations between DTC of balance and any of the outcome measures in the entire sample. In contrast, postural sway in the baseline and dual task condition were found to correlate with disability, fall risk, balance performance, fatigue, cognitive processing speed and age. Secondary analysis revealed different correlates of DTC of balance in those with low versus high baseline sway. The results suggest that the change in standing balance with the simultaneous performance of cognitive task may only be informative in individuals with minimal balance dysfunction.
认知和平衡功能障碍是多发性硬化症（MS）患者的常见症状。尽管传统上被视为独立的损伤，但在保持直立姿势的同时执行认知任务会导致 MS 患者增加姿势摆动（即平衡的双重任务成本（DTC））。然而，与这种现象相关的因素尚不清楚。本研究调查了多发性硬化症患者平衡双重任务成本的人口统计学、临床和认知相关性。62 名多发性硬化症患者在力平台上完成了安静站立和双重任务平衡测试。此外，他们提供了人口统计学信息，并进行了平衡、痉挛、跌倒风险和认知处理速度的临床测试。双重任务成本的计算方法是从基线到双重任务力平台条件下摆动面积的百分比变化。总体而言，在整个样本中，平衡双重任务成本与任何结果测量值之间均无显著相关性。相比之下，在基线和双重任务条件下的姿势摆动与残疾、跌倒风险、平衡表现、疲劳、认知处理速度和年龄相关。二次分析显示，在低基线摆动和高基线摆动的个体中，平衡双重任务成本的相关性不同。结果表明，在同时执行认知任务时站立平衡的变化可能仅在平衡功能障碍最小的个体中具有信息性。
