13岁男孩对递增运动的心血管反应和对训练的心血管适应

本研究的目的是用脉搏图法估测13岁男孩对递增负荷运动的心血管反应和评价心血管对运动训练的适应。结果表明,安静时和较小强度运动时,训练前和训练后的心血管动力学参数没有明显的差异（P>0.05）。但进行较大强度运动时,心率和平均动脉压明显较低（P<0.05）,而每搏输出量明显较大（P<0.05）,心输出量没有明显差异（P>0.05）。这些结论提示,训练前递增负荷运动时的心输出量的增加主要依赖于心率的提高,而训练后主要依赖于每搏输出量的增加。这是训练引起的心脏工作效率提高的一个有力证据。

THE CARDIOVASCULAR RESPONSES TO GRADED EXERCISES AND ADAPTATION TO TRAINING IN BOYS AGED 13

The object of this study is to estimate cardiovascular responses to graded exemses .and to evalute cardiovascular adaptation to training in boys aged 13 with agiography. The results show, there are not significantly different (P>0. 05) in cardiovascular dynamic parameters during rest and exercises at less intensity between posttraining and pretraining. However Comparing with pretraining, during exercises at greater intensity in posttraining, heart rate and mean artery pressure are significantly less (P<0. 05), while stroke volume is significantly greater (P<0. 05). Cardio output is not significantly different (P>0. 05). These suggest increased cardio output mainly depends on increased heart rate during exercises at greater intensity in pretraining and depends on increased stroke volume in post-training. This is a proof of increased heart work efficiecy for training.