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运用心阻抗二阶微分图分析了９ 名体育系女生在心率为１３０ 次·ｍｉｎ － １ 时，运动４５ ｍｉｎ 的 Ｓ Ｔ Ｉ和 Ｄ Ｔ Ｉ的变化趋势．结果表明，运动中 Ｓ Ｖ、 Ｃ Ｏ 均有不同程度的升高，这是由于心肌收缩性和舒张期心脏顺应性提高的综合结果；但在运动中 Ｓ Ｖ、 Ｃ Ｏ 的变化幅度基本不变，提示这一负荷对经常从事运动的青年人心脏功能的锻炼效果有限
The change trend of S T I and D T I after exercise for 45 min at heart rate of 130 times · min -1 was analyzed using the second order differential graph of heart impedance. The results showed that S V and C O increased in varying degrees during exercise, which was due to the systolic and diastolic cardiac compliance. However, the changes of S V and C O did not change substantially during exercise , Suggesting that this load has limited effect on the heart function of young people who exercise regularly