模拟失重下动脉血管反应性变化的实验研究
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摘要
航天飞行过程中,航天人员暴露于失重(微重力)环境将导致机体心血管功能状态的变化,称作“心血管脱锻练”,其主要表现为立位耐力不良。立位耐力的改变影响航天人员的工作能力。虽然经过几十年的大量工作,但飞行后立位耐力不良的机理目前仍不甚清楚,相应对抗措施的防护效果亦不理想。因此,探讨飞行后立位耐力不良发生的机理、发展新一代的对抗措施都是目前重力生理学的重要任务。
     已有的结果表明任何单一因素都不能圆满解释立位耐力不良的发生,因此目前认为其发生机理涉及多重机制。近来的一些工作提示,动脉系统功能的变化可能在飞行后立位耐力不良的发生中起着一定的作用。虽然已有工作提示交感缩血管反应减弱在立位耐力不良的发生中可能是一个重要因素,但是目前对于航天飞行后动脉系统自身的功能是否会发生变化,以及这些可能的变化是否在飞行后立位耐力不良的发生中起作用,均还知之甚少。此外,由于航天失重环境中流体静压作用消失,动脉系统各部分跨壁压分布与地面1G时不同,局部血流量也有改变,所以机体各部位动脉功能的改变可能也是不相同的。为此,我们进行了本工作,其目的在于阐明:动脉系统自身的功能在模拟失重下是否发生改变,不同部位动脉血管改变的特征如何,这些变化的发展时程又是怎样,变化是否可逆,以及变化的性质和机理。本工作的主要结果与发现如下:
Exposure to weightlessness / microgravity during space flight may lead to an altered state of cardiovascular function in crewmembers termed "cardiovascular deconditioning", manifested most clearly by their orthostatic intolerance. And the alterations in orthostatic stability can adversely affect performance of physical work of astronauts. Even after several decades of extensive research , the basic mechanism of postflight orthostatic intolerance has not been fully elucidated up to now, and the physiological effect of the countmeasures against orthostatic intolerance is limited. Understanding the nature of postflight orthostatic intolerance and development of new effective and efficient countermeasures against postflight orthostatic intolerance have therefore become the primary emphasis of the space life sciences research effort.
引文
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