Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
Aging Clin Exp Res. 2012 Apr;24(2):152-6. doi: 10.1007/BF03325161.
The purpose of this study was to examine the center of pressure (COP) trajectory at gait initiation in single- and dualtask conditions between elderly Fallers and Non-fallers.
Seventy-one community-dwelling elderly people (mean age 80.5 ± 7.6 years) voluntarily participated in this study. Participants were categorized as Fallers or Non-fallers on the basis of previous fall experience. In single- and dual-task conditions, participants performed gait initiation trials from a starting position on a force platform while COP data were collected. Steady-state walking time on a 10-m straight walkway in single- and dual-task conditions was also measured. In the dual-task condition, participants performed individual tests with simultaneous backward counting. Maximum COP displacements and velocities were calculated in the anteroposterior and mediolateral directions.
In the dual-task condition, Fallers had significantly smaller backward displacements and slower backward velocities of COP than Non-fallers, although there was no significant difference in these values in the single-task condition between groups. Steadystate walking time was also not significantly different in both single- and dual-task conditions between groups.
Gait-initiation performance in dual-task conditions may be a good discriminator between Fallers and Non-fallers.
本研究旨在比较单任务和双任务条件下老年人跌倒者和非跌倒者在起始步态时的压力中心（COP）轨迹。
71 名居住在社区的老年人（平均年龄 80.5±7.6 岁）自愿参加了这项研究。根据既往跌倒史，将参与者分为跌倒者和非跌倒者。在单任务和双任务条件下，参与者从力台上的起始位置开始进行起始步态试验，同时采集 COP 数据。还测量了单任务和双任务条件下 10 米直线行走的稳态行走时间。在双任务条件下，参与者同时进行个体测试和向后计数。计算了前向后和内外向 COP 最大位移和速度。
在双任务条件下，跌倒者的 COP 向后位移和向后速度明显小于非跌倒者，尽管在单任务条件下两组间无显著差异。在单任务和双任务条件下，两组的稳态行走时间也无显著差异。
双任务条件下的起始步态表现可能是跌倒者和非跌倒者的一个很好的区分指标。
