Smith L E, Besio W G, Tarjan P P, Asfour S S
St. Thomas University, Miami, USA.
Percept Mot Skills. 1998 Jun;86(3 Pt 1):955-64. doi: 10.2466/pms.1998.86.3.955.
Ten hemiplegic subjects completed 20 rapid dorsiflexions of their afflicted and nonafflicted limbs. Electrodes were attached to the tibialis anterior and the gastrocnemius muscles and electromyograms were recorded for their premotor time, motor time, and simple reaction time during ankle dorsiflexion and plantar flexion of their lower limbs. The fractionated components of reaction time, namely, premotor time and motor time, of both legs were statistically compared. It was found that the premotor time of the subject's stroke-affected limb was significantly slower than the premotor time of the nonaffected limb (control), with no differences between their associated mean motor times. These results supported the hypothesis that a stroke has a deleterious affect upon the central, premotor time processing centers and has no disruptive influence upon the peripheral motor time. Comparing the fractionated components of reaction time (premotor time and motor time), with simple reaction time, the former provided a more sensitive and valid method to detect possible injurious side effects of a stroke upon the brain's neuromotor transmission centers and subcenters, and their peripheral, stimulus, response network.
十名偏瘫患者对其患侧和未患侧肢体进行了20次快速背屈动作。电极连接到胫前肌和腓肠肌，并记录了他们下肢在踝关节背屈和跖屈过程中的运动前时间、运动时间和简单反应时间的肌电图。对双腿反应时间的细分成分，即运动前时间和运动时间进行了统计学比较。结果发现，受试者中风患侧肢体的运动前时间明显慢于未患侧肢体（对照组），而它们相关的平均运动时间没有差异。这些结果支持了以下假设：中风对中枢运动前时间处理中心有有害影响，而对周围运动时间没有干扰作用。将反应时间的细分成分（运动前时间和运动时间）与简单反应时间进行比较，前者提供了一种更敏感、有效的方法来检测中风对大脑神经运动传递中心及其子中心以及它们的外周刺激-反应网络可能产生的有害副作用。
