Programa de Pós-Graduação em Fisioterapia, Universidade Cidade de São Paulo, São Paulo, SP, Brazil.
Neurosci Lett. 2012 Mar 28;513(1):6-11. doi: 10.1016/j.neulet.2012.01.053. Epub 2012 Feb 9.
The present study aimed to investigate whether stroke survivals are able to use the additional somatosensory information provided by the light touch to reduce their postural sway during the upright stance. Eight individuals, naturally right-handed pre-stroke, and eight healthy age-matched adults stood as quiet as possible on a force plate during 35s. Participants performed two trials for each visual condition (eyes open and closed) and somatosensory condition (with and without the right or left index fingertip touching an instrumented rigid and fixed bar). When participants touched the bar, they were asked to apply less than 1N of vertical force. The postural sway was assessed by the center of pressure (COP) displacement area, mean amplitude and velocity. In addition, the mean and standard deviation of the force vertically applied on the bar during the trials with touch were assessed. The averaged values of COP area, amplitude and velocity were greater for stroke individuals compared to healthy adults during all visual and somatosensory conditions. For both groups, the values of all variables increased when participants stood with eyes closed and reduced when they touched the bar regardless of the side of the touch. Overall, the results suggested that, as healthy individuals, persons with post-stroke hemiparesis are able to use the additional somatosensory information provided by the light touch to reduce the postural sway.
本研究旨在探讨脑卒中幸存者是否能够利用轻触提供的额外躯体感觉信息来减少直立位时的姿势摆动。8 名自然右利手的脑卒中幸存者和 8 名健康的年龄匹配的成年人在测力板上尽可能安静地站立 35 秒。参与者在每种视觉条件（睁眼和闭眼）和躯体感觉条件（左右食指指尖触摸仪器化刚性固定杆和不触摸）下各进行两次试验。当参与者触摸杆时，他们被要求施加小于 1N 的垂直力。姿势摆动通过压力中心（COP）位移面积、平均幅度和速度来评估。此外，还评估了在触摸试验中垂直施加在杆上的力的平均值和标准差。与健康成年人相比，在所有视觉和躯体感觉条件下，脑卒中个体的 COP 面积、幅度和速度的平均值更大。对于两组参与者，当他们闭眼站立时，所有变量的值都会增加，而当他们触摸杆时，无论触摸的是哪一侧，这些值都会减小。总的来说，研究结果表明，作为健康个体，脑卒中后偏瘫患者能够利用轻触提供的额外躯体感觉信息来减少姿势摆动。
