变力性一词通常用来描述心肌收缩性的变化。
The term inotropic is commonly used in discussing changes in myocardial contractility.
结论：山参果汁总皂苷具有负性肌力和负性频率作用，即抑制心肌收缩和舒张功能，减慢心率、降低动脉血压。
Conclusion WGFS has the effects of negative frequency named restraining cardiac muscle contraction and stretch function, and reducing rhythum of the heart and blood pressure.
结论：XT通过阻滞豚鼠左房肌的电压依赖性和受体调控性钙通道而发挥抑制心肌收缩力的作用。
Conclusion: XT blocked not only the voltage dependent calcium channel, but also the receptor operated calcium channel in the isolated guinea pig atria.
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