Meerson F Z, Chashchina Z V
Kardiologiia. 1978 Sep;18(9):111-8.
Echocardiography was used to examine 20 highly trained athletes and 12 untrained persons at rest and during increasing physical load. It was established that in untrained persons the stroke volume in moderate and large physical loads increases mainly due to an increase in the diastolic output with the systolic output unchanged. In highly trained athletes the stroke volume with an equal load increases due both to growth in the diastolic output and to considerable decrease in the systolic output, i.e., due to the more complete ejection of blood from the cavity of the ventricle. As a result in trained patients a sufficient minute output in physical exertion is attained with less external work of the left ventricle and myocardial tension.
超声心动图用于检查20名训练有素的运动员和12名未经训练的人在静息状态以及体力负荷增加时的情况。结果发现，未经训练的人在中等和较大体力负荷时，每搏输出量增加主要是由于舒张期输出量增加而收缩期输出量不变。在训练有素的运动员中，同等负荷下每搏输出量增加是由于舒张期输出量增加以及收缩期输出量显著减少，即由于心室腔血液更完全地射出。因此，在训练有素的患者中，体力活动时只需左心室较少的外部功和心肌张力就能获得足够的心输出量。
