摘要
目的探讨冲突性心理应激对大鼠睡眠时相和睡眠节律的影响。方法将20只Wistar雄性大鼠按照体质量大小分成若干个小组后编号,然后查找随机数列表,按照体质量区域化随机分为2组,即空白组和模型组,每组10只,采用Vogel饮水冲突实验的改良方法,造成大鼠冲突性心理应激模型,检测造模1周后大鼠体质量和血清中皮质酮(CORT)浓度的变化,以确定造模标准。8只Wistar大鼠埋置脑电和肌电电极,在造模1周后通过16道生理记录仪描记大鼠12h的脑电和肌电图,进而探究该方法造成的冲突性心理应激对大鼠睡眠结构的影响。结果在造模1周后,与空白组相比模型组大鼠体质量显著下降(t=2.87,P〈0.05),血清皮质酮浓度显著升高(t=5.19,P〈0.05)。造模1周后,与空白组比较,模型组大鼠睡眠总时间、浅睡眠、慢波睡眠和快动眼睡眠睡眠时间[空白组:(337.8±84.2)min,(169±49.2)min,(136.9±40.8)min、(33.1±10.1)min;模型组:(155.4±16.7)min、(111.6±16.4)min、(30.6±4.9)min、(12.6±3.3)min]均显著减少(t=6.75,2.43,5.51,5.78,P〈0.05),其中与空白组相比,浅睡眠占睡眠总时间的百分比[(49.6±3.4)%、(71.7±5.4)%]显著增加(t=6.90,P〈0.05),慢波睡眠所占百分比[(40.3±10.9)%、(19.8±3.2)%]显著下降(t=6.74,P〈0.05),REM所占比重无明显变化(t=1.57,P〉0.05);由大鼠睡眠觉醒节律图可看出,睡眠持续时间缩短,觉醒次数增加,睡眠时相切换频繁,睡眠趋于零散化。结论冲突性心理应激使大鼠下丘脑一垂体一。肾上腺轴功能亢进,体质量下降,进而导致睡眠时相以及睡眠节律发生改变。
Objective To discuss the impact of conflict psychological stress on rats'sleep time and sheep phrase. Methods 20 Wistar male rats were randomly divided into vehicle group and model group, 10 in each group. The improved experiment of Vogel drinking water conflict was used to establish the model of conflict psy- chological stress in rats and monitoring the changes of rats'weight and concentration of corticosterone (CORT) in serum after a week. After one week,the 12 h EEG and EMG of rats were traced by the polygraph in order to clarify the effect of conflict psychological stress on rats'sleep time and sleep phrase. Results After one week,compared with vehicle group the weight of model group decreased significantly ( t = 2.87, P 〈 0.05 ) , the concentration of CORT in serum raised significantly( t = 5.19, P 〈 0.05 ). A week later, compared the vehicle group, total sleep time (TST), light sleep, slow wave sleep (SWS) and rapid eye movement sleep (REM) time in model group rats ( (337.8 ± 84.2) rain, ( 169 ±49.2) min, ( 136.9± 40.8 ) min, ( 33.1 ± 10.1 ) min for vehicle group ; ( 155.4 ±16.7 ) min, ( 111.6 ± 16.4 ) rain, ( 30.6 ± 4.9 ) min, ( 12.6 ±3.3 ) min for model group) were significantly reduced ( t = 6.75,2.43,5.51,5.78, P 〈 0.05 ), and the proportion of lightsleep increased ( (49.6 ± 3.4 ) %, ( 71.7 ± 5.4 ) % ) ( t = 6.90, P〈 0.05 ), the proportion of SWS decreased( (40.3 ± 10.9 ) %, ( 19.8 ± 3.2 ) % ) ( t = 6.74, P 〈 0.05 ) ; but no significant change in the proportion of REM ( t = 1.57, P 〉 0.05 ). Rats' sleep-wake rhythm figure indicated that the rats'sleep duration reduced and the number of awakening increased; sleep tended to be fragmentation. Conclusions Conflict psychological stress lead to hypothalamus-pituitary-adrenal axis hyperactivity, weight loss, and the rhythm of sleep and sleep phase change in rats.
出处
《中华行为医学与脑科学杂志》
CAS
CSCD
北大核心
2012年第2期105-107,共3页
Chinese Journal of Behavioral Medicine and Brain Science
基金
国家自然科学基金资助项目(81073077)
关键词
心理应激
血清皮质酮
睡眠时相
睡眠节律
Psychological stress
Corticosterone
Sleep phase
Sleep rhythm