航天员长期失重飞行后返回地面时,无一例外出现立位耐力降低。为了选拨心血管调节功能良好的航天员,美苏多采用单纯立位和下身负压方法。但由于前者下肢血液潴留较少,后者不存在静水压差对颈动脉窦压力感受器刺激,均未取得满意效果。考虑到长期失重后立位时,回心血量下降及对压力感受器的刺激量都大于飞行前,我们采用了立位加下身负压方法(简称负-立方法)模拟航天员返回地面后站立时心血管系统遇到的刺激量。经过几年实践,证明此 Astronauts returned to the ground after a long-term weightless flight, with no exception of reduced standing stamina. In order to elect the astronaut with good cardiovascular regulation, the United States, the Soviet Union and the United States use a simple stand-alone and lower body negative pressure method. However, due to the former lower limb blood retention less, the latter does not exist hydrostatic pressure on the carotid sinus baroreceptor stimulation, did not achieve satisfactory results. Taking into account the standing position after long-term weightlessness, the amount of blood returned to the heart and the baroreceptor stimulation are greater than before the flight, we use the legislation plus the body negative pressure method (referred to as negative - vertical method) to simulate the astronauts to return to the ground after standing The amount of stimulus the cardiovascular system encounters. After several years of practice, to prove this