大鼠下丘脑生长抑素对六周递增负荷运动的应答性和适应性变化

来源 :2010年中国运动生理生化学术会议 | 被引量 : 0次 | 上传用户:lgl5201314
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  目的:通过观察SD雄性大鼠6周递增负荷运动过程中SST和SSTR-1的变化,旨在探讨SST和SSTR-1对6周递增负荷运动的应答性和适应性变化特征及其可能的机理,为揭示运动性免疫抑制产生的机理等提供理论依据.方法:72只SD雄性大鼠随机分为实验组和对照组.实验组进行6周递增负荷运动,第一周负荷为10m/min,第二周为20 m/min,之后,每递增5m/min为下一周负荷,直至第6周.每次运动30min,1次/d,6d/W.负荷形式采用0坡度匀速跑台运动;对照组不参加运动.分别于第0、2、4、6周末完成同周相同定量负荷运动前、运动后即刻和运动后3小时经全身灌流固定后取脑及垂体.应用Leica石蜡轮转切片机对组织蜡块进行连续冠状切片,后经免疫组织化学染色后使用Image-Pro Plus6.0图像分析软件分析.结果:(1)各组大鼠下丘脑SST及垂体SSTR-1对6周递增负荷运动的适应性变化特征为:对照组大鼠SST在6周内无显著性变化,SSTR-1在2周时最低,其次为0、4、6周;实验组大鼠SST在2周安静状态时较0周明显增多,之后呈下降趋势;SSTR-1安静状态下4周最高,依次为6、2、0周.(2)实验组大鼠下丘脑SST及垂体SSTR-1对一次性运动的应答性变化特征为:0、4周运动后即刻SST的表达增多,2、6周减少;0、2、4周大鼠运动后3小时均可恢复至运动前安静状态,6周则不能恢复.S STR-1在运动即刻及恢复3小时后的变化规律与SST一致,但运动结束后3小时的恢复程度较SST低,有滞后现象.结论:(1)适宜运动可以减少安静状态SST的表达,有利于维持自身的免疫机能;(2)正常和接受适宜运动训练的个体运动后即刻表达增多,处于运动应激动员和衰竭阶段的个体运动后即刻表达减少,大鼠下丘脑SS对一次性运动表达的特征与HPA轴的兴奋有关;(3)运动后即刻及安静状态下,过度训练均引起大鼠下丘脑SST及垂体SSTR-1表达减少,对于对抗免疫抑制的发展具有重要意义,是机体防御抑制保护的表现.
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