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  • A few problems of physiology of circulation during weightlessness

    Paper ID



    • R.M. Bayevsky
    • O.G. Gazenko


    USSR Academy of Sciences






    Experimental data obtained in spaceflights point to a definite succession in reactions of the cardiovascular system. At present, at least three phases may be distinguished: (1) Reactions associated with the transit from overloads in the powered stage to weightlessness, mainly due to the afteraction of previous stresses. (2) Reactions associated with the reconstruction of blood circulation regulation which take place in the first hours of the stay under conditions of weightlessness, (3) Reactions associated with the adaptation to the new level of the functioning of the cardiovascular system corresponding to new physical conditions and new regulatory interrelations in the organism. Data obtained in prolonged spaceflights indicate that the new level of the functioning of the cardiovascular system established on the first day of flight is preserved on the next days. These observations, however, need further experimental verification. Further investigations into the state of the cardiovascular system under weightless conditions and in transit periods are of great practical importance for maintaining astronauts’ working capacities, especially in prolonged spaceflights.