Studies On Affecting Factor Of Juvenile At Athletes Who Had Got Exercise Induced Cardiac Fatigue

Objective:Endurance exercise juvenile athletes were selected as subjects,to observe the effects of exercise intensity on EICF and the cumulative effects of consecutive repetitive exercise on EICF under the laboratory condition.Methods:Objects are 13 juvenile middle-distance race athletes.4 radical sports are demanded,which includes a GXT and 3 times of constant running speed exercise in treadmill.Aim of GXT is to determine personalized sports intensity of following 3 repeated sports.Initial invariable intensity sport(â… ) is personalized 80%of the ventilation anaerobic threshold intensity.At least 4 days after the initial sport,the 2nd (â…¡-1) and 3rd(â…¡-2)constant intensity exercise are conducted with the sports intensity maintained at the level of 100%the ventilation anaerobic threshold intensity.Time betweenâ…¡-1 andâ…¡-2 is at least 4 hours.Echo cardiograph is conducted immediately after constant running speed exercise in treadmill.Results:â‘ Significant depression of left ventricle systolic function after 3 constant running speed exercise,which manifests reduction of SV,EF and FS.Also after the first high-intensity sports,reduction is found in E/A,which reflect the left ventricular collective diastole function.â‘¡By comparingâ… andâ…¡-1 sports of different intensify, paired t test indicates in high intensify sports statistic significance of depression of E:A after sports as well as LVMWS elevation.For low intensify sports,no significance of the two indexes.â‘¢After combination of the two sports data,double factirial analysis of variance shows insignificant effect of sports intensify and sequenced repeated sports on cardiac function. Conclusion:1) Simulation of juvenile athletes routine exercise level can lead to EICF in the study objects,which indicates frequent EICF in the endurance sports juvenile athletes during routine sports exercise.2) High intensify sports is prone to deteriorate juvenile athletes EICF compared with low intensify ones.3) There is no collective effect of left ventricular function depression after sequenced repeated sports conducted in juvenile athletes...