大鼠肠屏障功能变化与不同强度游泳运动的关系

背景:研究在运动应激状态下肠道屏障损伤发生机制及规律,将为运动应激肠道屏障保护剂的研制提供理论依据。目的:观察不同强度游泳运动后大鼠肠屏障的变化。设计:随机对照动物实验。单位:湖北大学运动人体科学实验室和武汉大学医学院基础实验室。材料:选取3周龄健康雄性SD大鼠36只,随机分为对照组10只、适度运动组12只和过度性运动组14只,3组大鼠饲养条件一致。方法:①对照组平时不运动。②适度运动组:进行无负重游泳,前3d适应性游30min,并在1周内逐渐延长至60min,然后每天游泳1次,每周6次,训练6周。③过度运动组:前3d适应性游30min,并在1周内延长时间至120min,训练1周后,进行过度游泳训练。然后每天游泳1次,每周6次,持续4周。最后2周,每天早、晚1次,每周6次。主要观察指标:①大鼠肠屏障参数:血浆内毒素,肠黏膜通透性,细菌移位率。②大鼠肠黏膜组织结构。结果:①大鼠肠屏障参数结果:大鼠过度运动后血浆内毒素增加2倍,肠黏膜通透性提高2.5倍,细菌移位率增加230%。②适度运动对大鼠肠黏膜组织结构无明显影响,过度运动使大鼠肠上皮细胞内高尔基复合体和粗面内质网扩张,上皮细胞高度水肿,炎细胞浸润。结论:适度运动可以改善机体肠功能;过度运动造成机体肠屏障损伤,导致消化系统出现病理性征候群。

Relationship between intestinal barrier function and swimming exercise of different intensities

BACKGROUND; Studying the pathogenesis and rule of intestinal barrier damage under exercise stress will provide theoretical evidence for preparing intestinal barrier protectant under this state.OBJECTIVE : To observe the changes in intestinal barrier of rats following different intensities of swimming exercise. DESIGN: Randomized controlled animal experiment.SETTING: Laboratory of Exercise Sciences & Sports Medicine, Huibei University; Basic Laboratory, Medical College, Wuhan University.MATERIALS: Thirty-six healthy male SD rats, aged 3 weeks, were involved and randomized into 3 groups: control group (n =10), proper exercise group (n =12) and excessive exercise group (n =14). The rats of three groups were raised in the same condition.METHODS:①Control group: Rats did not exercise normally. ②Proper exercise group: Rats swam without loading. In the first 3 days, they adaptatively swam for 30 minutes and gradually for 60 minutes within 1 week, then they swam once a day, 6 times a week, 6 weeks in total. ③Excessive exercise group: In the first 3 days, they adaptatively swam for 30 minutes and gradually for 120 minutes within 1 week. After trained for 1 week, they were given excessive swimming training. Then, they were forced to swan once a day, 6 times a week, within 4 weeks successively. Within later 2 weeks, the rats were forced to swan once in the morning and evening separately, 6 times a week.MAIN OUTCOME MEASURES:①Intestinal barrier parameter: intestinal mucosal permeability, plasma endotoxin, becterium shift rate.②Intestinal mucosal membrane structure.RESULTS: Thirty-six rats were involved in final analysis.①After excessive exercise, plasma endotoxin of rats was doubly increased, intestinal mucosal permeability was enhanced by 2.5 times, and bacterium shift rate was increased by 230%.②Proper exercise had no obvious influences on the structure of intestinal mucosal membrane tissue of rats, and excessive exercise expanded Golgi complex in the intestinal epithelial cells and rough endoplasmic reticulum of rats, caused severe edema of epithelial cells and infiltration of inflammatory cells.CONCLUSION: Proper exercise improves intestinal function of body; excessive exercise causes intestinal barrier injury of body and pathological syndrome of digestive system.