Heller B W, Datta D, Howitt J
Medical Physics and Clinical Engineering, Central Sheffield University Hospitals, UK.
Clin Rehabil. 2000 Oct;14(5):518-22. doi: 10.1191/0269215500cr345oa.
To compare the cognitive demand of walking when using a conventional prosthesis with that using a microprocessor-controlled prosthesis.
Ten unilateral transfemoral amputees wearing conventional pneumatic swing phase control (conventional prosthesis) prostheses walked on a treadmill which enforced a pattern of constantly varying speeds. The subjects simultaneously performed a simple or a complex distracting task. Following a period of accustomization, the subjects performed the same test wearing a prosthesis with microprocessor control of swing phase damping (the Intelligent Prosthesis).
The three-dimensional trajectory (sway) of a retroreflective marker attached to the forehead was measured by a video-based motion analysis system, and used as a measure of gait quality. The ratio of the sway for the complex task over the simple task (the 'automation index') was used as a measure of the degree of automation of gait.
No significant differences were found in the automation index between the two devices. However, the total sway for the conventional prosthesis was significantly higher. Sway during the complex distracting task was significantly higher than during the simple task.
The microprocessor-controlled prosthesis was not found to be less cognitively demanding than a conventional prosthesis.
比较使用传统假肢与使用微处理器控制假肢行走时的认知需求。
10名单侧股骨截肢者穿着传统的气动摆动期控制（传统假肢）假肢在跑步机上行走，跑步机设定不断变化的速度模式。受试者同时执行简单或复杂的分心任务。经过一段时间的适应后，受试者佩戴具有微处理器控制摆动期阻尼功能的假肢（智能假肢）进行相同测试。
通过基于视频的运动分析系统测量附着在前额的反光标记的三维轨迹（摆动），并将其用作步态质量的指标。复杂任务的摆动与简单任务的摆动之比（“自动化指数”）用作步态自动化程度的指标。
两种装置的自动化指数无显著差异。然而，传统假肢的总摆动明显更高。复杂分心任务期间的摆动明显高于简单任务期间。
未发现微处理器控制的假肢在认知需求上低于传统假肢。
