运动训练对坐位和卧位运动时心缩间期(STI)的影响

THE EFFECTS OF PHYSICAL TRAINING ON SYSTOLIC TIME INTERVALS IN SITTING AND SUPINE EXERCISE

用阻抗法测定了20名体育系男性大学生(实验组)和20名非体育系男性大学生(对照组)在坐位和卧位时,安静、负荷运动及恢复期三种状况下的心缩间期(STI)。结果表明,运动训练对安静PEP、QS_2、PEP/LVET无明显影响,有训练者具有较好的心泵功能、心肌收缩性能和心力储备,有较强的摄取和利用氧的能力和负荷承受力以及对心脏活动的调节力;负荷运动中的LVET、PEP/LVET比值可灵敏而准确地评定心功能的优劣。

Systolic time intervals(STI) were examined with electrical impedance at rest, during exercise and on recovery in sitting and supine body position. The subjects were divided into two groups. 20 physical education department students(trained group-TG) and 20 non-physical education department stu-dents(control group-CG). The results showed that (l)physical training had no apparent effect on PEP,QS2,PEP/LVET at rest. (2)The TG had a better cardiac pump performance, myocardial contractility and cardiac reserve capacity and had a stronger capacity of absorbing and using oxygen, exercising capacity and adjusting capacity of the heart to exercise. (3) During exercise, the LVET and the ratio of PEP/LVET can reflect the cardiac function more sensitively and exactly.