失重可引起航天员心血管功能失调,表现为返回后立位时血压的降低和心率的异常升高及运动耐力下降。由于压力突然改变时压力感受器反射功能在调节血液动力学上起主要作用,因此,在研究失重心血管系统失调的起因时,必须了解失重对压力感受器反射功能的影响。本实验观察了7名SLS-1航天飞机飞行员在飞行前、中、后时压力感受器反射功能的变化。具体的测量时间是,飞行前第105、75、45、15天,飞行中第2、4、6、8天 Weightlessness can cause astronaut cardiovascular dysfunction, manifested as a decrease in blood pressure and an abnormal rise in heart rate and decreased exercise tolerance when standing back. Because baroreflex reflex plays a major role in the regulation of hemodynamics due to a sudden change in pressure, it is important to understand the effects of weightlessness on baroreflex reflectance when studying the causes of disorders in the weightless cardiovascular system. In this experiment, we observed the changes of baroreceptor reflex function in 7 SLS-1 pilots before, during and after flight. The specific measurement time is 105,75,45,15 days before flight, the first 2,4,6,8 days in flight