ABSTRACT
Objective To compare the differences between electronic lesion of pyramidal tract and internal capsule hemorrhage in establishing spastic rat models.Methods Experimental animals were randomly assigned into three groups:electronic lesion group (EL),internal capsule hemorrhage group (ICH) and control group (CON,n=28).Seven,14,21 and 28 d after each treatment,the general conditions of the rats and behavioral tests on them were recorded; and the gastrocnemius Hoffman reflex (H reflex) was detected; and the percentage of type Ⅰ muscle fiber in quadriceps femoris were examined by skeletal muscle myosin ATP staining.Results Rats in EL group and ICH group showed significant differences in behavioral tests as compared with CON group (P＜0.05); the duration of symptoms of neurological deficit was significantly longer in EL group than the other two groups (P＜0.05).In contrast to CON group,the amplitude of gastrocnemius H reflex in EL group and ICH group was increased and the latency of H reflex was decreased with significant difference (P＜0.05),which could be observed till 28 d and 14 d,respectively,after each treatment.The percentage of type Ⅰ muscle fiber in quadriceps femoris EL and ICH groups was obviously increased as compared with that in CON group (P＜0.05),which persisted to 21 and 14 d,respectively,after each treatment.Meanwhile,rats in EL group showed significant differences in behavioral test,gastrocnemius H reflex and percentage of type] muscle fiber in quadriceps femoris as compared with ICH rats (P＜0.05).Conclusion The muscle tone of EL rats is higher,and lasts longer than that ofICH rats.