Saremi Kaveh, Marehbian Jon, Yan Xiaohong, Regnaux Jean-Philippe, Elashoff Robert, Bussel Bernard, Dobkin Bruce H
Neurologic Rehabilitation and Research Program, Department of Neurology, Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA.
Neurorehabil Neural Repair. 2006 Jun;20(2):297-305. doi: 10.1177/1545968306287171.
Measures of walking ability in large clinical trials are usually limited to a timed short-distance walk and the distance walked in a fixed time. A new integrated system of 5 accelerometers was tested for reliability and compared to a footswitch system to determine if the accelerometers offered a practical option for the acquisition of spatiotemporal gait parameters.
Leg accelerations and decelerations were defined in relation to simultaneous kinematic and electromyographic data acquired from a healthy subject. Eight healthy adults and 6 independent ambulators with hemiparetic stroke walked 15 m at 2 different speeds wearing both the accelerometers and footswitches. Twelve healthy subjects walked at 5 different speeds repeated 3 times on each of 2 days wearing the accelerometers. Walking speed, cadence, stride length, and single- and double-limb support, swing, and stance times were calculated.
No differences (t test, P > 0.2) were found between footswitch and accelerometer variables when comparing all left or right legs in healthy subjects and all paretic or unaffected legs in stroke subjects. A 2-way nested ANOVA model (speed, left and right legs, trial, and session) with the accelerometers at walking speeds from 0.5 to 1.8 m/s revealed high reproducibility of all measures.
The accelerometry system provided reliable and valid spatiotemporal measures of gait for the upper range of speeds likely to be targeted for rehabilitation interventions in ambulatory subjects.
大型临床试验中步行能力的测量通常局限于定时短距离步行以及在固定时间内行走的距离。对一种新的由5个加速度计组成的集成系统进行了可靠性测试，并与脚踏开关系统进行比较，以确定加速度计是否为获取时空步态参数提供了一种实用的选择。
根据从一名健康受试者采集的同步运动学和肌电图数据来定义腿部的加速和减速。8名健康成年人以及6名患有偏瘫性中风的独立行走者佩戴加速度计和脚踏开关，以2种不同速度行走15米。12名健康受试者佩戴加速度计，在2天中的每一天以5种不同速度重复行走3次。计算步行速度、步频、步长以及单腿和双腿支撑、摆动和站立时间。
在比较健康受试者的所有左腿或右腿以及中风受试者的所有患侧或未患侧腿时，脚踏开关和加速度计变量之间未发现差异（t检验，P>0.2）。使用加速度计在0.5至1.8米/秒的步行速度下进行的双向嵌套方差分析模型（速度、左腿和右腿、试验和时段）显示所有测量值具有高度可重复性。
加速度测量系统为非卧床受试者康复干预可能针对的较高速度范围提供了可靠且有效的步态时空测量。
