后肢制动对肌梭传入放电活动的影响  

Changes in muscle spindle afferent discharge activities in rat soleus following hindlimb immobilization

作　　者：赵雪红[1] 张文静[1] 周茜[1] 高艳[1] 樊小力[2] 刘广斌[3] 

机构地区：[1]湖北文理学院医学院机能学部,湖北襄阳441053 [2]西安交通大学医学院生理教研室,陕西西安710061 [3]南昆士兰大学生物和物理科学系,澳大利亚昆士兰图文巴

出　　处：《南方医科大学学报》2015年第2期252-255,共4页Journal of Southern Medical University

基　　金：国家自然科学基金(31300981);湖北省自然科学基金(2012FFC05601);湖北文理学院科研项目(2012ya006)~~

摘　　要：目的观察后肢制动不同时期单一肌梭感觉末梢放电活动的改变。方法石膏固定建立大鼠后肢制动模型,雌性大鼠随机分为后肢制动3 d组、7 d组、14 d组及对照组。用空气隔绝法,观察制动不同时期单一肌梭的自发放电、0.05 mg/ml琥珀酰胆碱灌流及牵拉至伸长位后肌梭放电活动的改变。结果后肢制动3 d肌梭的自发放电活动和对琥珀酰胆碱灌流的反应明显降低(分别为P<0.01和P<0.05),制动14 d后伸长位肌梭的传入放电频率降低(P<0.01)。单个动作电位时程也随着制动时间的延长而显著延长(P<0.01)。结论后肢制动可致肌梭的传入放电活动减少,这可能与肌梭自身收缩特性的改变有关。Objective To investigate the changes in the afferent discharge activities of the sensory nerve endings in muscle spindles of rats with hindlimb immobilization. Methods Piaster cast was used immobilize the hindUimbs of rats. Using air-gap technique, the spontaneous discharge of the muscle spindles and its responses to perfusion with succinylcholine （0.05 mg/ml） and suspension in an extended position were observed in isolated muscle spindles from rats with hindlimb immobilization for 3, 7, and 14 days. Results The muscle spindles of rat soleus showed a sharp decrease in spontaneous discharge frequency （P〈 0.01） and response to succinylcholine perfusion after 3 days of hindlimb immobilization （P〈0.05）. Significant changes of the firing rate in an extended position was observed in rats after a 14-day immobilization （P〈0.01）. The duration of individual spikes was significantly prolonged following hindlimb immobilization （P〈0.01）. Conclusion Muscle spindle discharges decrease significantly in rats following hindlimb immobilization, which might be related to reduced contractile properties of the muscle spindle.

关 键 词：肌梭 梭内肌纤维 后肢脱负荷 制动 放电 

分 类 号：R336[医药卫生—人体生理学]