心血管机能水平是田径运动员成绩好坏的决定性因素。因此,提高心血管机能水平的训练至关重要。长期以来,每周训练三次,每次20分钟跑似乎已成了公认的达此目的的运动训练准则。但最近美国的体育专家们指出,持续20分钟跑并非必需。 他们认为,10分钟训练跑可以达到理想的效果。两组10分钟跑和单一的20分钟跑其价值近乎相等;同样,两组15分钟跑和30分钟跑的作用也差不多。但超出30分钟,就不是这 Cardiovascular function is the decisive factor of track and field athletes’ grades. Therefore, training to improve cardiovascular performance is crucial. For a long time, training three times a week, every 20 minutes running seems to have become recognized as a sport training guidelines for this purpose. But recently American sports experts point out that running for 20 minutes is not necessary. They think that 10 minutes training run can achieve the desired effect. The two 10-minute runs and the single 20-minute run are nearly equal in value; similarly, the two groups of 15-minute runs and 30-minute runs have similar effects. But beyond 30 minutes, this is not the case