不同有氧运动时间对衰老大鼠骨质成分的影响

背景:实验表明,适宜运动可以延缓衰老,可以增加骨量的积累和减少骨量的丢失.目的:验证有氧运动对衰老大鼠骨质成分的影响.设计、时间及地点;随机对照动物实验,于2007-04/06在西安体育学院动物实验室完成.材料:清洁级离乳2月龄雄性SD大鼠64只,随机分为正常对照组、非模型运动组、衰老模型组和模型运动组,每组16只,分别在第6,9周各处死8只.方法:以D-galactose(D-半乳糖)建立衰老大鼠模型.①正常对照组和衰老模型组大鼠不进行任何训练.②非模型运动组和模型运动组大鼠进行6周和9周的游泳运动.主要观察指标:6,9周末检测各组大鼠血清碱性磷酸酶、骨钙素、Ⅰ型前胶后羧基端前肽、总钙、无机磷、镁含量,以及尿钙、尿无机磷、尿镁、尿羟赖氨酸糖甙含量.③光镜检查各组股骨组织骨小梁变化.结果:6,9周末,与正常对照组比较,衰老模型组血清碱性磷酸酶、Ⅰ型前胶后羧基端前肽、总钙、血清镁、尿钙、尿无机磷、尿羟脯氨酸水平降低,非模型运动组和模型运动组上述指标升高.6,9周末,与正常对照组比较,衰老模型组血清骨钙素、无机磷、尿镁、尿羟赖氨酸糖甙水平升高,非模型运动组和模型运动组上述指标下降.9周运动指标恢复效果好于6周.光镜检查衰老模型组大鼠骨小梁明显稀少,非模型运动组和模型运动组单位体积内的骨小梁增加.结论:有氧运动对衰老大鼠的股骨骨质成分的形态结构有着很大的影响,有延缓骨质疏松作用.

Effect of different time aerobic exercises on osseous composition in aging rats

BACKGROUND: Studies show that proper exercise has the effect of anti-aging, increasing bone mass accumulation and reducing bone mass loss. OBJECTIVE: To investigate the effect of aerobic exercises on osseous composition In aging rats. DESIGN, TIME AND SETTING: A randomized control animal experiment was completed in the Animal Experiment Laboratory of Xi'an Sports Institute from April to June in 2007. MATERIALS: A total of 64 clean male SD rats weaned for 2 months were randomly divided into a normal control group, a non-modeling exercise group, an aging model group and a modeling exercise group, with 16 ones in each group. Every 8 rats of each group were sacrificed at the 6th and 9th week respectively.exercise for 6 and 9 weeks. MAIN OUTCOME MEASURES: At the end of week 6 and 9, rats in each group were detected regarding to the following measures: serum alkaline phosphatase, bone gla protein, serum propeptide of type] procollagen, serum total calcium, serum inorganic phosphorus, serum magnesium, urinary calcium, urinary inorganic phosphorus, urinary magnesium, urinary hydroxylysine glycoside. Bone trabecula changes in femoral bone tissue were observed with light microscope. RESULTS: Compared with the normal control group, the aging model group got a decrease at the following indexes at both week 6 and week 9, namely, serum alkaline phosphatase, serum propeptide of type Ⅰ procellagen, serum total calcium, serum magnesium, urinary calcium, urinary inorganic phosphorus, urinary hydroxyproline. While in the non-modeling exercise group and the modeling exercise group, these above-mentioned indexes increased. Compared with the normal control group, the aging model group got an increase at the following indexes at both week 6 and week 9, namely, serum osteocalcin, inorganic phosphorus, adnary magnesium, urinary hydroxylysine glycoside. While in the non-modeling exercise group and the modeling exercise group, these above-mentioned indexes decreased. In Addition, exercise of 9 weeks led to a better recovery result than that of 6 weeks. The detection under light microscope showed an obvious few bone trabeculas in the aging model group and an increase of bone trabeculas per unit volume in the non-modeling exercise group and the modeling exercise group. CONCLUSION: Aerobic exercise has a great effect on the morphosis of femoral bone osseous composition in aging rats, and it can delay osteoporosis.