低G锻炼对高G致大鼠记忆功能和平衡能力变化的影响

目的探讨低G锻炼对高G致大鼠记忆功能和平衡能力改变的影响。方法 32只雄性SD大鼠随机分为对照组、+ 1 0Gz/5min组、锻炼 3d组和锻炼 5d组 4组 ,每组 8只。锻炼组分别在 + 1 0Gz/5min暴露前进行 3d或 5d的 + 4Gz/3min锻炼 ( 1次 /d)。观察单次 + 1 0Gz/5min暴露后即刻、1d、2d、4d和 6d大鼠记忆功能和平衡能力的变化。结果 + 1 0Gz组大鼠在 +Gz暴露后各时间点正确率较对照组均显著降低 (P <0 .0 1 ) ,反应时均显著延长 (P <0 .0 1 ) ,平衡能力在暴露后即刻及 2d时显著变差(P <0 .0 1 )。 + 4Gz/3min锻炼 3d组正确率在暴露后 1d、2d和 6d较对照组显著降低 (P <0 .0 5 ) ,在2d、4d和 6d时较 + 1 0Gz组显著升高 (P <0 .0 1 ) ;反应时在暴露后各时间点较对照组均显著延长 (P<0 .0 5 ) ,在 1d、2d、4d和 6d时较 + 1 0Gz组显著缩短 (P <0 .0 1 ) ;平衡能力在暴露后即刻及 2d时较+ 1 0Gz组显著好转 (P <0 .0 1 )。 + 4Gz/3min锻炼 5d组正确率和反应时在暴露后各时间点较对照组均无显著差异 ;在暴露后 1d、2d、4d和 6d较 + 1 0Gz组显著改善 (P <0 .0 1 ) ;平衡能力在暴露后即刻及 2d时较 + 1 0Gz组显著好转 (P <0 .0 1 )。结论 + 4Gz/3min锻炼对高G致大鼠记忆功能损害和平衡能力具有一定的保护作用。

Effects of Repeated Lower G Exposures on High-G Induced Memory and Balance Changes in Rats

Objective To study the protective effects of repeated +4 Gz/3 min exposures on memory and balance changes induced by +10 Gz/5 min exposure in rats. Method 32 male SD rats were randomly divided into 4 groups: control group(C); +10 Gz/5 min group (10 Gz); 3 d training group (3 d); 5 d training (5 d) group (exposed to +4 Gz/3 min per day for 3 or 5 days before +10 Gz/5 min exposure). Changes of memory and balance in rats of all the 4 groups were observed after +10 Gz/5 min exposure. Result In +10 Gz group, the percentage of correct reaction (CR) decreased significantly at all times after +10 Gz exposure (P<0.01), and the reaction time (RT) lengthened significantly at all times after +10 Gz exposure (P<0.01); as compared with control group. In 3 d training group, CR decreased significantly at 1 d, 2 d and 6 d after +10 Gz exposure(P<0.05), RT lengthened significantly at all times after +10 Gz exposure(P<0.05); as compared with control group. CR increased significantly at 2 d, 4 d and 6 d after +10 Gz exposure (P< 0.01), RT shortened significantly at 1 d, 2 d, 4 d and 6 d after +10 Gz exposure (P<0.01) as compared with +10 Gz group. In 5 d training group, there were no apparent changes compared to control group; but CR increased significantly and RT shortened significantly at the time of 1 d, 2 d, 4 d and 6 d after +10 Gz exposure (P<0.01) as compared with +10 Gz group. Balancing function (BF) of +10 Gz group decreased significantly immediately and 2 d after +10 Gz exposure (P< 0.01) as compared with control group. BF in 3 d and 5 d training group improved significantly immediately and 2 d after +10 Gz exposure as compared with +10 Gz group (P<0.01). Conclusion It is suggested that repeated low +Gz exposures could provide protective effect on memory and balance changes induced by high +Gz exposure in rats.