Kalinichenko V V, Asiamolov B F, Zhernavkov A F
Kosm Biol Aviakosm Med. 1976 Sep-Oct;10(5):18-23.
Reactions of the circulation system of cosmonauts to the up and down body movements were studied after 30-day and 63-day flights. All the four cosmonauts showed a decline in the orthostatic tolerance. An improved system of countermeasures against unfavourable effects of weightlessness used in the 63-day flight helped to maintain a better orthostatic tolerance of the crewmembers than that of the 30-day cosmonauts. It is assumed that a rapid increase of orthostaic tolerance postflight indicates an adequate maintenance of functional capabilities of circulation and suggests possible stimulation of its antigravity mechanisms prior to reentry in order to prevent postflight orthostatic disorders. An exposure to weightlessness increased the capacity of circulation to counteract the blood redistribution in the cranial direction in the head-down position. This capacity became more pronounced and stable with an increase in the flight time.
对30天和63天飞行后的宇航员循环系统对身体上下移动的反应进行了研究。所有四名宇航员的直立耐力均有所下降。63天飞行中使用的改进的对抗失重不利影响的系统，有助于使机组人员保持比30天飞行的宇航员更好的直立耐力。据推测，飞行后直立耐力的快速增加表明循环功能能力得到了充分维持，并表明在重返大气层之前可能刺激了其抗重力机制，以预防飞行后直立性障碍。暴露于失重状态增加了循环系统在头低位时抵消血液向颅侧重新分布的能力。随着飞行时间的增加，这种能力变得更加明显和稳定。
