摘要
航天后立位耐力降低普遍存在 ,其机理仍不清楚。一般认为血容量减少是航天后立位耐力降低的一个重要因素。现有对抗航天后立位耐力降低的措施均与血容量有关。微重力 ( μG)和模拟 μG时研究表明 :μG与现有模拟 μG模型时人体生理学变化的主要差异表现在低压区循环和体液、电解质代谢。细胞外体液主要受心肺反射调节。因此 ,采用适当的模拟 μG模型研究低压区循环、心肺反射变化的时间过程 ,对认识立位耐力降低机理和制定更有效的对抗立位耐力降低的措施具有重要意义。
Orthostatic intolerance commonly occurs after spaceflight, but its mechanisms remain to be clarified. It is believed that the reduction of blood volume might be one of the important factors. So the current countermeasures against orthostatic intolerance are aimed to control the changes of blood volume. The main differences between physiological effects of microgravity and simulated microgravity on humans appear in the circulation of the low pressure side and in humoral and electrolyte metabolism. Reflexes elicited from the low pressure side are very important for regulation of the extracellular fluids. The authors postulated that for a further understanding of mechanisms of orthostatic intolerance after spaceflight and to establish appropriate countermeasures against orthostatic intolerance, it is important to study the course of changes of the circulation in the low pressure side and the reflexes thus elicited with more appropriate method of simulation.
出处
《航天医学与医学工程》
CSCD
2000年第2期152-156,共5页
Space Medicine & Medical Engineering
关键词
微重力
立位耐力
血容量
心肺反射
航天
microgravity
orthostatic tolerance
blood volume
cardiopulmonary reflex
