中国科学院心理研究所机构知识库

腹腔注射不同剂量吗啡（8，4，2，1mg／kg／day），观察各组大鼠在给药后不同时间内的活动性（locomotoractivity，LA）。连续给药8天，每天给药后95min内，每间隔15min，记录大鼠5min内在限定空间中所走格数。结果表明：随吗啡给药剂量或次数增加，LA呈升高趋势；使大鼠LA明显兴奋的适宜低剂量为4mg／kg／day，该剂量下每天给药后15－20minLA为峰值，而且此时段LA逐日升高，至第8日出现下降趋势。此结果在一定程度上动态地揭示了吗啡剂量、作用时间及其运动效应之间的相互关系。

The locomotor achvities (LA) of rats were tested every 15 mins for 95 mins after morphine injected intraperitoneally with 8, 4, 2, 1mg/kg/day respectively once a day during the 8-day experiment,and the number of squares (10 X 10 cm2) which the rats passed by in 5 mins were recorded. Results showed that there were significant differences between the groups treared with 8 or 4mg/ kg / day of morphine and normal saline on day2-8, and between the groups with 2mg/kg/day of morphine and the control group on day2,...