There are several theories, but by far the most popular one is the MusclePump Theory.
有几种理论，但目前最流行的是肌肉运动的理论。
2
Whereas conventional motor-powered pumps tend to get clogged, the artificial musclepump has larger internal orifices, Walters said.
鉴于传统的电机驱动的泵往往堵塞，人造肌肉泵具有较大的内孔，沃尔特斯说。
3
Hypertrophic cardiomyopathy (HCM). This is a disease in which the heart muscle (myocardium) becomes abnormally thick, making it harder for the heart to pump blood.