Lee S, Yao J, Acosta A M, Dewald J A
Northwestern University, Chicago, IL 60611, USA.
Annu Int Conf IEEE Eng Med Biol Soc. 2009;2009:1581-4. doi: 10.1109/IEMBS.2009.5334127.
Previous studies and clinical observations reveal that stroke survivors show the resurgence of the asymmetric tonic neck reflex (ATNR) both in static and dynamic conditions during maximal efforts. This observation may imply more reliance on the brainstem pathways following stroke. However, the effect of ATNR during a dynamic condition that represents more natural movement, such as reaching, has not been studied before. During reaching movements, the application of a robot controlled haptic environment is important to quantify the effect of ATNR following stroke. Therefore, this paper reports the use of a novel setup using the ACT(3D) robotic device to investigate and quantify this reflexive behavior. Our preliminary results demonstrate that the effect of ATNR is significant in the stroke population when abducting the shoulder at 25% of maximum ability. These results show that the ATNR affects reaching distance especially when shoulder loading in abduction is required. In conclusion, these preliminary results provide evidence that the effect of ATNR in stroke subjects during reaching task can be quantified by using a novel 3-D robotic setup.
先前的研究和临床观察表明，中风幸存者在最大努力的静态和动态条件下都会出现非对称紧张性颈反射（ATNR）的复苏。这一观察结果可能意味着中风后对脑干通路的更多依赖。然而，ATNR在代表更自然运动（如伸手）的动态条件下的作用此前尚未得到研究。在伸手动作过程中，应用机器人控制的触觉环境对于量化中风后ATNR的作用很重要。因此，本文报告了使用一种新颖的设置，即利用ACT(3D)机器人设备来研究和量化这种反射行为。我们的初步结果表明，当中风患者以最大能力的25%外展肩部时，ATNR的作用显著。这些结果表明，ATNR会影响伸手距离，尤其是在需要外展肩部负重时。总之，这些初步结果提供了证据，表明在伸手任务期间，中风患者中ATNR的作用可以通过使用一种新颖的三维机器人设置来量化。
