Choice stepping response and transfer times: Effects of age, fall risk, and secondary tasks
Choice stepping response and transfer times: Effects of age, fall risk, and secondary tasks
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DOI：
10.1093/gerona/62.5.537
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发表时间：
2007-05-01
影响因子：
5.1
通讯作者：
Lord, Stephen R.
中科院分区：
文献类型：
--
作者：
St George, Rebecca J.;Fitzpatrick, Richard C.;Lord, Stephen R.
背景随着年龄的增长，平衡控制的生理成分的恶化增加了跌倒的风险。避免跌倒也可能需要更高水平的认知处理来选择正确的运动和步进反应。在这里，我们调查如何竞争的认知任务和障碍，以步进影响启动和执行阶段的选择步进反应时间在年轻人和老年人。研究了三组：年轻人（年轻人：23-40岁，n = 20）、福尔斯风险低的老年人（OLR：75-86岁，n = 18）和福尔斯风险高的老年人（OHR：78-88岁，n = 22）。检查了四个条件：选择踏步、选择踏步+障碍、选择踏步+工作记忆任务、选择踏步+工作记忆任务+障碍。测量了每种条件下的步反应和转移时间，除了犹豫的脚步，与障碍物的接触和记忆测试中的错误。老年参与者组的反应和转移时间明显长于年轻组，OHR组的反应和转移时间明显长于OLR组。第X组次级任务对反应时有显著的交互作用（F-2，F-21.5 = 12.6，p
Background. Deterioration with age of physiological components of balance control increases fall risk. Avoiding a fall can also require higher level cognitive processing to select correct motor and stepping responses. Here we investigate how a competing cognitive task and an obstacle to stepping affect the initiation and execution phases of choice stepping reaction times in young and older people.Methods. Three groups were studied: young persons (YOUNG: 23-40 years, n = 20), older persons with a low risk of falls (OLR: 75-86 years, n = 18), and older persons with a high risk of falls (OHR: 78-88 years, n = 22). Four conditions were examined: choice stepping, choice stepping + obstacle, choice stepping + working memory task, and choice stepping + working memory task + obstacle. Step response and transfer times were measured for each condition, in addition to hesitant stepping, contacts with the obstacle and errors made in the memory test.Results. Older participant groups had significantly longer response and transfer times than the young group had, and the OHR group had significantly longer response and transfer times than the OLR group had. There was a significant Group X Secondary task interaction for response time (F-2,F-21.5 = 12.6, p