[Cardiovascular reactions in orthostatic tests and human resistence to vestibular stimuli]. / Serdechno-sosudistye reaktsii pri ortostaticheskikh probakh i rezistentnost' cheloveka k vestibuliarnym razdrazhiteliam.

The paper discusses the relationship between the vestibular stability of man and his cardiovascular regulation that develops during the recumbent-to-upright change of the body position. It describes specific parameters typical of the intermediate processes of the cardiovascular system that are prognostically important for the evaluation of the vestibular stability. The paper gives equations of multiple regression helping to predict the level of vestibular resistance with respect to the pattern of intermediate processes of the cardiovascular system during orthostatic tests.

[Prediction and analysis of pulse frequency in cosmonauts by the method of extrapolation modelling in the class of differential equations]. / Prignozirovanie i analiz chastoty pul'sa kosmonavtov metodom ékstrapoliatsionnogo modelirovaniia v klasse differentsial'nykh uravenii

The paper discusses the use of the methods of the theory of automatic control and identification for predicting and analyzing the cardiovascular function of crewmembers in long-duration space missions. On the basis of the inflight heart rate data models characterizing the cardiovascular function can be built. The models have the form of linear differential equations of the second order and are used to calculate values of the heart rate. With respect to the parameters of the equations, the characteristics of the quality and specificity of the cardiovascular regulation inflight are determined. The paper describes the practical application of the above methods to predict and analyze the cardiovascular function of the crewmembers of the Soviet Salyut-1 and Salyut-4 and US Skylab-3 space stations.