Aiming movements of the upper limbs can be classified either as discrete, or reciprocal, or cyclic. The control of these movements after a stroke can be affected. The aim of this experimental, cross-sectional study was to characterize the performance of these movements after the right and left hemisphere chronic stroke. Thirty-six individuals aged between 40 and 70 years, right-handed, were allocated into three groups (control, right stroke, and left stroke). Participants were asked to perform aiming movements on a tablet. Individuals after stroke performed the tasks only with their ipsilesional limb, while the control group performed movements with both limbs. The reaction and movement times, peak velocity, and the variability and error of the endpoint were analyzed. Individuals after stroke presented a worse performance in all movement classes as expected, but differently depending on the damaged hemisphere. Participants with right hemisphere damage showed larger endpoint errors, while those with left hemisphere damage had longer reaction and movement times. Both differences were seen consistently in discrete and reciprocal, but not in cyclic movements. Cyclic movements presented shorter latencies, were faster, and showed greater endpoint errors when compared to discrete and reciprocal movements. These results suggest that stroke affects differently the performance of discrete and reciprocal movements according to the hemisphere lesion side, but not in cyclic movements. Different levels of motor control among the three classes of movements by the nervous system may justify these results.

上肢的瞄准运动可以分为离散的、交互的或循环的。中风后这些运动的控制可能会受到影响。这项实验性横断面研究的目的是表征左右半球慢性中风后这些运动的表现。36 名年龄在 40 至 70 岁之间的右利手被分为三组（对照组、右撇子和左撇子）。参与者被要求在平板电脑上执行瞄准动作。中风后的个体仅用同侧肢体执行任务，而对照组则用双肢执行任务。分析了反应和运动时间、峰值速度以及终点的变异性和误差。正如预期的那样，中风后的个体在所有运动类别中的表现都较差，但根据受损的半球而有所不同。右半球受损的参与者表现出更大的终点误差，而左半球受损的参与者的反应和运动时间更长。这两种差异在离散和相互运动中一致出现，但在循环运动中则不然。与离散和往复运动相比，循环运动的延迟更短，速度更快，并且端点误差更大。这些结果表明，根据半球病变侧，中风对离散运动和往复运动的表现有不同的影响，但对循环运动没有影响。神经系统对三类运动的不同水平的运动控制可能证明这些结果是合理的。