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Walking stability during cell phone use in healthy adults

机译：健康成年人使用手机时的行走稳定性

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The number of falls and/or accidental injuries associated with cellular phone use during walking is growing rapidly. Understanding the effects of concurrent cell phone use on human gait may help develop safety guidelines for pedestrians. It was shown previously that older adults had more pronounced dual-task interferences than younger adults when concurrent cognitive task required visual information processing. Thus, cell phone use might have greater impact on walking stability in older than in younger adults. This study examined gait stability and variability during a cell phone dialing task (phone) and two classic cognitive tasks, the Paced Auditory Serial Addition Test (PASAT) and Symbol Digit Modalities Test (SDMT). Nine older and seven younger healthy adults walked on a treadmill at four different conditions: walking only, PASAT, phone, and SDMT. We computed short-term local divergence exponent (LDE) of the trunk motion (local stability), dynamic margins of stability (MOS), step spatiotemporal measures, and kinematic variability. Older and younger adults had similar values of short-term LDE during all conditions, indicating that local stability was not affected by the dual-task. Compared to walking only, older and younger adults walked with significantly greater average mediolateral MOS during phone and SDMT conditions but significantly less ankle angle variability during all dual-tasks and less knee angle variability during PASAT. The current findings demonstrate that healthy adults may try to control foot placement and joint kinematics during cell phone use or another cognitive task with a visual component to ensure sufficient dynamic margins of stability and maintain local stability. (C) 2015 Elsevier B.V. All rights reserved.
机译：与步行过程中使用手机相关的跌倒和/或意外伤害的数量正在迅速增加。了解同时使用手机对步态的影响可能有助于制定行人安全指南。以前的研究表明，当同时进行的认知任务需要视觉信息处理时，老年人比年轻人具有更明显的双重任务干扰。因此，与年轻人相比，使用手机对老年人的步行稳定性可能会产生更大的影响。这项研究检查了手机拨号任务（电话）和两个经典的认知任务（步态听觉串行加法测试（PASAT）和符号数字模态测试（SDMT））期间的步态稳定性和变异性。九名年龄较大的健康成年人和七名较年轻的健康成年人在四种不同条件下在跑步机上行走：仅行走，PASAT，电话和SDMT。我们计算了躯干运动的短期局部发散指数（LDE）（局部稳定性），动态稳定性（MOS），步幅时空量度和运动学变异性。在所有条件下，老年人和年轻人的短期LDE值均相似，这表明双重任务不会影响局部稳定性。与仅走路相比，在电话和SDMT情况下，老年人和年轻人的平均中外侧MOS行走较大，而在所有双重任务期间，踝关节角度的变异性明显较小，而在PASAT期间膝关节角度的变异性较小。当前的研究结果表明，健康的成年人可能会尝试在使用手机或其他具有视觉组件的认知任务期间控制脚的放置和关节运动，以确保足够的动态稳定性并保持局部稳定性。 （C）2015 Elsevier B.V.保留所有权利。

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