Bishop B
Phys Ther. 1975 Jan;55(1):28-34. doi: 10.1093/ptj/55.1.28.
Phasic neural mechanisms are heavily involved in volitional movements, where as tonic mechanisms support postural adjustments. Yet, the two systems are so intimately related that any disturbance in one will exert profound effects on the other. Whether one system or the other is involved preferentially in different neural disorders is not known; hence, tests are needed to evaluate phasic and tonic functions independently. In this article, the classical applications of the tendon jerk reflex and H-response for assessing phasic mechanisms are first reviewed. Following this review, the tonic stretch reflex and tonic vibration reflex (TVR) are analyzed and compared. The effects of experimentally ablating or stimulating precise brain regions are described as a means of revealing the role of supraspinal mechanisms in the TVR. Finally, the responses to vibratory stimulation in specific motor disorders are examined and discussed as to their usefulness in prognosis and diagnosis.
相位性神经机制在随意运动中起重要作用,而紧张性机制则支持姿势调整。然而,这两个系统联系紧密,以至于其中一个系统的任何干扰都会对另一个系统产生深远影响。尚不清楚这两个系统中哪一个在不同的神经疾病中更优先涉及;因此,需要进行测试以独立评估相位性和紧张性功能。在本文中,首先回顾了用于评估相位性机制的腱反射和H反射的经典应用。在此回顾之后,对紧张性牵张反射和紧张性振动反射(TVR)进行了分析和比较。描述了通过实验性切除或刺激精确脑区的效果,以此作为揭示脊髓上机制在TVR中的作用的一种手段。最后,研究并讨论了特定运动障碍中对振动刺激的反应在预后和诊断方面的有用性。