【作者】 汶希；

【导师】 时庆德；

【作者基本信息】 北京体育大学 ， 运动人体科学， 2007， 硕士

【摘要】 目的:以少年耐力运动员为被试者,在实验室条件下,观察运动强度对EICF影响及相继重复运动对EICF积累效应。方法:被试者为13名二级少年男性中长跑运动员。实验要求被试者进行4次急性运动,包括一次递增负荷跑台运动测试(GXT)以及三次45min恒定跑速跑台运动。GXT的目的主要在于确定与随后的三次运动相对一致的个体化运动强度。首次恒定强度运动(Ⅰ)为个体80%通气无氧阈强度。首次运动后至少间隔4天,进行第二次(Ⅱ-1)及第三次(Ⅱ-2)恒定强度运动,运动强度为个体100%通气无氧阈强度,Ⅱ-1与Ⅱ-2间隔约4h。恒定强度跑台运动前以及运动后即刻利用超声心动仪进行心功能测定。结果:1)与运动前相比,三次恒定强度运动后左室收缩功能均显著下降,表现为每搏量(SV)、射血分数(EF)及左心室短轴缩短率(FS)降低,且在首次高强度运动后,反映左室整体舒张功能的左室早期和晚期充盈峰值速度比值(E:A)也显著下降;2)比较Ⅰ与Ⅱ-1两次强度不同运动发现,配对t检验分别统计两次运动发现,在高强度运动(Ⅱ-1),运动后较运动前E:A下降及左室经线室壁应力(LVMWS)升高具有统计学显著性。而对于低强度运动(Ⅰ),这两项指标并无显著性差异;3)进一步将两次运动数据全部合并,利用两个重复测量的双因素方差分析统计发现,运动强度及相继重复两次运动主效应对心功能无显著影响。结论:1)以模拟少年运动员日常训练运动应激水平的运动测试方案可导致少年运动员产生EICF。提示,少年耐力运动员在日常训练过程中可能经常出现EICF;2)相对于低强度耐力运动而言,青少年运动员高强度耐力运动倾向于使EICF程度加重;3)少年运动员相继重复两次运动未呈现出左室功能进一步下降的积累性效应。更多还原

【Abstract】 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(Ⅰ) is personalized 80%of the ventilation anaerobic threshold intensity.At least 4 days after the initial sport,the 2nd (Ⅱ-1) and 3rd(Ⅱ-2)constant intensity exercise are conducted with the sports intensity maintained at the level of 100%the ventilation anaerobic threshold intensity.Time betweenⅡ-1 andⅡ-2 is at least 4 hours.Echo cardiograph is conducted immediately after constant running speed exercise in treadmill.Results:①Significant 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.②By comparingⅠandⅡ-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.③After 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更多还原