游泳耐力训练对高脂饮食大鼠肝组织自由基代谢及肝细胞凋亡的影响

目的：通过对8-12周游泳耐力训练前后大鼠肝组织SOD、MDA、线粒体膜电位以及肝细胞凋亡率的测定及分析,考察长期耐力训练对于高脂饮食诱导大鼠肝细胞凋亡的影响与机制,为运动预防NASH提供新的切入点。方法：采用SD雄性大鼠44只,适应性喂养1周后,随机分为6组：8周对照组、8周高脂组、8周高脂运动组、12周对照组、12周高脂组和12周高脂运动组。对照组给予普通饲料喂养,高脂组和高脂运动组给予高脂饲料喂养;对照组和高脂组不施加运动干预,高脂运动组大鼠于每日上午8～9时进行无负重游泳运动,每周5次。运动负荷为第1周每次游泳30min,第2周60min,第3周90min,然后以此运动量一直保持到12周结束。用流式细胞仪法检测8周和12周耐力训练后肝细胞自由基代谢、线粒体膜电位和细胞凋亡变化。结果：8周高脂运动组的肝细胞凋亡率显著高于高脂组（P〈0.05）,12周高脂运动组则显著低于高脂组（P〈0.05）;8周高脂运动组肝脏SOD显著高于高脂组（P〈0.05）,12周也显著高于高脂组（P〈0.05）;8周高脂运动组MDA显著低于高脂组（P〈0.05）,12周组非常显著低于高脂组（P〈0.01）;8周高脂运动组线粒体膜电位显著高于高脂组（P〈0.05）,12周组非常显著高于高脂组（P〈0.01）。结论：长期有氧耐力训练可以通过降低脂质过氧化物的生成和加速过氧化物的清除,提高肝脏的抗氧化能力,使肝细胞线粒体产生适应性改变,膜电位升高,最终抑制高脂饮食诱导NASH大鼠肝细胞凋亡率的显著升高。

About the effects of swimming endurance training on the liver free radicals metabolism and heptocytes apoptosis of high-fat-diet rats

In order to provide a entry point for exercises to prevent NASH,this article comparatively analyses 6 groups of rats who were feed by different forages and swimming training through lasting different experience times,and gets the conclusion that the long term aerobic endurance training can develop the antioxidant ability of rats＇ liver through decreasing the lipid peroxide and accelerating the elimination of its products.