运动心脏结构可复性的研究

The Structural Reversibility in Athletic Heart

为了进一步探讨运动心脏结构与功能的可复性问题及其与病理心脏的本质差异，通过实验动物模拟运动心脏，观察了停止运动训练8周后心脏重量和某些超微结构的变化，并应用激光扫描共聚焦显微镜与新一代钙荧光指示剂fluo－3／AM负载方法对。心肌活细胞内具有生物活性的游离钙的动态变化进行了研究。结果显示，经过12周耐力训练后，心肌活细胞内游离钙浓度静息值无显著性改变，心肌收缩时其游离钙浓度峰值较对照组显著增高11％（P＜0．05）；心肌细胞内心房特殊颗粒的体密度、面密度及数密度分别显著增高41％、12％及5％；心肌细胞线粒体体密度及其与肌原纤维比值分别显著增高60％和61％，线粒体内膜和嵴体积密度显著增高18％；心肌毛细血管与肌纤维的比值显著增高78％；心肌毛细血管腔体密度和面密度分别显著增高28％和13％。停止训练8周后，心肌收缩时其胞内游离钙浓度峰值较训练时显著降低14％（＜0．05）；心肌细胞内心房特殊颗粒的体密度显著降低25％；心肌细胞线粒体体密度及其与肌原纤维比值分别显著降低25％和36％，线粒体内膜和嵴体积密度显著降低11％；心肌毛细血管与肌纤维的比值分别显著降低29％。心肌毛细血管腔体密度和面密度分别显著降低14％和12％，基本恢复到正常对照水平。研究结果表明?

In order to investigate the development and prognosis of exercise induced heed remodeling, the changes of the intracellular[ Ca2 + ]were determinedin single isolated ventricular myocyte under the laser scanning confocal microscopy; the myocardial ultrastructures were analzed by computer image system, 80 male SD rats were randomly divided into endurance running group ,decondi tioning group and their sedentary coneds. The results showed that, after training, there were no significant changes in myocardial[ Ca...