PDF(Pubmed)
Abstract：
Gait speed and timed-up-and-go (TUG) predict cognitive decline, falls, and mortality. Dual-tasks may be useful in cognitive screening among people living with dementia (PWD), but more evidence is needed. This cross-sectional study aimed to compare single- and dual-task performance and determine the influence of dementia severity on dual-task performance and interference. Thirty PWD in two residential care facilities (Age: 81.3 ± 7.1 years; Montreal Cognitive Assessment: 10.4 ± 6.0 points) completed two trials of single- (feet apart) and dual-task posture (feet apart while counting backward), single- (walk 4 m) and dual-task gait (walk 4m while naming words), and single- (timed-up-and-go (TUG)), and dual-task functional mobility (TUG while completing a category task) with APDM inertial sensors. Dual-tasks resulted in greater sway frequency, jerk, and sway area; slower gait speed; greater double limb support; shorter stride length; reduced mid-swing elevation; longer TUG duration; reduced turn angle; and slower turn velocity than single-tasks (ps < 0.05). Dual-task performance was impacted (reduced double limb support, greater mid-swing elevation), and dual-task interference (greater jerk, faster gait speed) was related to moderate-to-severe compared to mild PWD. Moderate-to-severe PWD had poorer dynamic stability and a reduced ability to appropriately select a cautious gait during dual-tasks than those with mild PWD, indicating the usefulness of dual-tasks for cognitive screening.
摘要：
步态速度和定时上升（TUG）预测认知能力下降，falls,和死亡率。双重任务可能在痴呆症患者（PWD）的认知筛查中有用，但需要更多的证据.这项横断面研究旨在比较单任务和双任务表现，并确定痴呆严重程度对双任务表现和干扰的影响。在两个住宅护理设施中的30名PWD（年龄：81.3±7.1岁；蒙特利尔认知评估：10.4±6.0分）完成了两项单任务姿势（双脚分开）和双任务姿势（向后计数时双脚分开）的试验，单（步行4m）和双任务步态（在命名单词时步行4m），和单-(定时上行(TUG))，以及带有APDM惯性传感器的双任务功能移动性（完成类别任务时的TUG）。双重任务导致更大的摇摆频率，混蛋,和摇摆区域；步态速度较慢；双肢支撑较大；步幅较短；中摆高度降低；TUG持续时间较长；转弯角度减小；转弯速度比单任务慢（ps<0.05）。双任务表现受到影响(双肢支撑减少，更大的中间摆动高程)，和双重任务干扰(更大的冲击，与轻度PWD相比，更快的步态速度）与中度至重度相关。与轻度PWD相比，中度至重度PWD的动态稳定性较差，并且在双重任务中适当选择谨慎步态的能力降低，表明双重任务对认知筛查的有用性。
