Preliminary results of medical investigations during piloted flights in the Salyut-6 program.

The changes observed during flight on the whole corresponded with the preflight prognosis and reflected the phase nature of the processes of adaptation. They were shown by blood redistribution symptoms, fluctuations in the main indices of hemodynamics at rest not going beyond the limits of the physiological norm, an increase in the pulse-filling of the head with blood, and a decrease in that of the shank. The reaction of the blood circulation to a physical load and the application of negative pressure varied, and in a number of investigations during flight it was more pronounced than on Earth.