Optimization of different intensities of exercise preconditioning in protecting exhausted exercise induced heart injury in rats

作     者：Zheng Ping Weijia Qiu Mei Yang Xiaoli Zhang Dongying Wang Peng Xu Ziwen Wang Xuebin Cao 

作者机构：Department of Cardiology and NephrologyHospital of the 82nd Group Army of PLABaoding071000China 

出 版 物：《Sports Medicine and Health Science》 (运动医学与健康科学(英文))

年 卷 期：2021年第3卷第4期

页      面：218-227页

学科分类：0403[教育学-体育学] 1002[医学-临床医学] 10[医学] 

基　　金：supported by grants from the Hebei Province Natural Science Foundation of China(no.H2019104017)and Special Fund for Team of Sports Induced Heart Injury Prevention and Treatment in Military. 

主　　题：Exercise preconditioning Exhaustive exercise-induced cardiac injury Mitochondrial respiratory function 

摘      要：This study was to optimize the exercise preconditioning(EP)intensity in protecting from exhaustive exercise-induced cardiac injury(EECI).A total of 98 male Sprague-Dawley rats were divided into 7 groups(n=14):the control group(C),the exhaustive exercise group(EE)and the EP+EE groups,which include the V10(53.0%VO_(2max)),V15(58.4%VO_(2max)),V20(67.0%VO_(2max)),V26(74.0%VO_(2max))and V30(80.0%VO_(2max))groups.Except the C group,the other groups were subjected to treadmill running.The serum contents of N terminal pro B type natriuretic peptide(NT-proBNP)and cardiac troponin I(cTn-I)were detected by the enzyme-linked immunosorbent assay method,ECG was recorded,heart function was detected by pressure volume catheter and the activities of mitochondrial electron transfer pathway(ET pathway)complexesⅠ,ⅡandⅣwere measured by high-resolution respiration instrument.Compared to the EE group,the EP groups have shown decrease of NT-proBNP and cTn-I,improvement of mitochondrial respiratory function and car-diac function.Compared to other EP groups,the V26 group has shown significant decrease of myocardial enzymes and improvement of mitochondrial function.The correlation analysis showed the EP effect was proportional to EP intensity in the range of 53.0%VO_(2max)-74.0%VO_(2max).High intensity and long duration of exhaustive exercise caused cardiac injury and EP could decrease serum level of NT-proBNP and cTn-I,improve electrical derangement and the left ventricular function,and raise the activities of ET pathway complexesⅠ,ⅡandⅣ.The protection of EP on EECI was improved as the EP intensity was increased from 53.0%VO_(2max)to 74.0%VO_(2max)and when EP intensity was 74.0%VO_(2max),the effect was the most obvious among all the setting EP groups.