立位加下身负压时的心血管反应  

THE RESPONSES OF CARDIOVASCULAR DURING HEAD-UP TILT PLUS LOWER BODY NEGATIVE PRESSURE

作　　者：沈羡云[1] 李树春[1] 向求鲁[1] 孟京瑞[1] 阎晓霞[1] 孙亚志[1] 徐立华 范亚明 庄祥昌 

机构地区：[1]航天医学工程研究所

出　　处：《空间科学学报》1991年第3期226-234,共9页Chinese Journal of Space Science

摘　　要：本实验采用了立位加下身负压方法(负-立方法)模拟航天员返回地面后受到的重力刺激,检查了20名健康受试者在单纯立位和负-立时的心血管反应。按照受试者在负-立时的心率、外周阻力和耐受时间,将受试者分为四种不同的反应类型,其耐力和潜力是血管型>混合型>心脏型>欠调型。结果表明负-立方法是一种很好的心血管功能检查方法,可应用于航天员心血管功能选拔。A method of head-up tilt plus lower body negative pressure (LBNP-HUT) is used in simulating the stress of gravity upon crewman after returing to the earth from spaceflight, in order to study the regulatory function of cardiovascular system. The subjects are 20 healthy young men. The examination consisted of a simple head-up tilt (HUT, 75°) experiment for twice, each lasting 20 min and two times of LBNT-HUT, of the latter -5333 Pa LBNP is acted with subjects in supine position on a tilt table for 2 min then the subjects are turned to HUT (75°) for 20 min while the LBNP is maintained. Four types of regulation are found, according to the responses of the subjects in heart rate, perpheral resistance and tolerance time during LBNP-HUT, which are vessel-type (VT), mixture-type (MT), heart-type (HT) and under regulation-type (URT). The cardiovascular regulative capacity during LBNP-HUT is in the order of VT>MT>HT>URT. The results show that the method of LBNP-HUT is an effective approach to examine the regulatory function of cardiovascular system, as it con provide larger stress upon the subjects than the simple method does, when only HUT or LBNP alone is applied. It can be used in the selection of cardiovascular function of astronauts.

关 键 词：航天员 心血管功能 立位耐力 

分 类 号：R852.3[医药卫生—航空、航天与航海医学]