van Vliet Paulette M, Sheridan Martin R
University of Birmingham, Egbaston, UK.
Arch Phys Med Rehabil. 2007 Oct;88(10):1325-31. doi: 10.1016/j.apmr.2007.06.769.
To investigate the coordination of reach-to-grasp components in hemiparetic and healthy subjects.
Split-plot repeated-measures design with 3 factors (group, object size, movement speed).
Movement laboratory.
Twelve hemiparetic and 12 age-matched healthy subjects.
Not applicable.
We used motion analysis to collect information on the kinematic variables of movement duration, peak velocity, peak deceleration, and maximum aperture, and the time of peak velocity, peak deceleration, and maximum aperture expressed as a percentage of movement duration during 32 reaching movements by each subject. We examined the coordination between the 2 components in 2 ways. First, we investigated the correlation between time of hand opening and start of hand transport, and between time of maximum aperture and time of peak deceleration. Second, we compared movements at preferred and fast speeds (manipulation of transport component) and to 2 different-sized cups (manipulation of grasp component).
Both groups demonstrated a temporal coupling between grasp and transport components at the start of the reach and at the time of maximum aperture. Both groups increased the aperture of grasp for larger cups and increased the maximum grip aperture, and had a shorter deceleration phase for faster movements. The deceleration phase of the hemiparetic patients was longer than that of the healthy subjects, however, and the components were not as tightly coupled.
The hemiparetic patients, who had a moderate amount of functional recovery, were similar to healthy subjects in their ability to control reach-to-grasp components. Their performance was not as skilled, however.
研究偏瘫患者和健康受试者抓握动作各组成部分之间的协调性。
采用含3个因素（组别、物体大小、运动速度）的裂区重复测量设计。
运动实验室。
12名偏瘫患者和12名年龄匹配的健康受试者。
不适用。
我们使用运动分析来收集每个受试者在32次伸手动作过程中运动持续时间、峰值速度、峰值减速度、最大孔径等运动学变量的信息，以及峰值速度、峰值减速度和最大孔径出现时间占运动持续时间的百分比。我们通过两种方式检查两个组成部分之间的协调性。首先，我们研究手张开时间与手开始移动时间之间，以及最大孔径时间与峰值减速度时间之间的相关性。其次，我们比较了以偏好速度和快速速度进行的动作（对移动组成部分的操控）以及对两种不同大小杯子的动作（对抓握组成部分的操控）。
两组在伸手动作开始时和最大孔径出现时，抓握和移动组成部分之间均表现出时间耦合。两组对于较大杯子抓握时均增大了孔径并增大了最大抓握孔径，并在较快动作时减速阶段更短。然而，偏瘫患者的减速阶段比健康受试者更长，且各组成部分之间的耦合没有那么紧密。
功能恢复程度中等的偏瘫患者在控制抓握动作组成部分的能力方面与健康受试者相似。然而，他们的表现不够熟练。
