A, B: In comparison to control naive animals (A), rats with spinal ischemic injury, which showed increase in stretch reflex activity, had significantly increased H-wave response after electrical stimulation of the tibial nerve (see Table 1 for details).
C: In animals with spinal ischemic injury, systemic administration of tizanidine (1 mg kg-1; i.p.) effectively suppressed otherwise increased H-wave response (Table 1).
D, E: In animals with spinal ischemic injury but without tizanidine treatment isoflurane anesthesia (2%) lead to a potent reduction in H-reflex amplitude (Table 1).