Daily stair activities have become increasingly challenging for older adults with deterioration in physical and cognitive capabilities. However, the dynamic stability of older adults during stair descent under a concurrent dual-task condition remains undetermined. The gait and dynamic stability variables of 40 healthy older adults were measured under single- and dual-task conditions during stair descent. The step length, step width, and single support time did not significantly increase (p > .05) under the dual-task condition during stair descent. The medial-lateral center of mass velocity significantly increased (p < .003), whereas the medial-lateral margin of dynamic stability value significantly decreased (p < .006) at the landing and initial single support under the dual-task condition during stair descent. The self-regulatory ability of healthy older adults under the dual-task condition during stair descent was underestimated. Dual tasking displayed a positive impact on the anterior-posterior dynamic stability of healthy older adults.

中文翻译：

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双重任务范式下的老年人在楼梯下降过程中的动态稳定性。

随着身体和认知能力的下降，老年人的日常楼梯活动变得越来越具有挑战性。但是，并发双工情况下，老年人在下降楼梯时的动态稳定性仍未确定。在楼梯下降过程中，在单任务和双任务条件下测量了40名健康老年人的步态和动态稳定性变量。在双下降状态下，双工状态下步长，步长和单支撑时间没有显着增加（p> .05）。在楼梯上的双工情况下，着陆和初始单支撑时，内侧质量中心速度明显增加（p <.003），而内侧动态稳定性值的内部边界明显降低（p <.006）下降。在楼梯下降过程中双任务情况下健康老年人的自我调节能力被低估了。双重任务对健康老年人的前后动态稳定性表现出积极影响。