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在不断提高训练负荷量和强度情况下的幼年化,是现代高水平体育运动的趋势特点。在安排少年运动员尤其是15—16岁少年运动员训练时,往往没有考虑到,正是这一时期具有心脏发育正在完善的特点。因此,研究少年运动员心脏活动能力——心肌的收缩与放松机能——在年内周期训练中的变化是特别必要的。应该指出,如果说对运动员的心脏收缩机能的研究已经相当完善,那么对心肌放松机能的研
In the continuous increase of training load and strength of the juvenile, is the trend of modern high-level sports characteristics. In arranging the training of juvenile athletes, especially 15-16 year old athletes, they often fail to consider that it is during this period that their heart development is being improved. Therefore, researching the juvenile athlete’s ability to move the heart - the contractile and relaxing function of the heart muscle - is particularly necessary during the annual cycle of training. It should be pointed out that if the research on the cardiac contractile function of athletes has been quite complete, then the research on myocardial relaxation function