[The effect of super-erythematous doses of UV-radiation on the general condition of the human body].

The effect of excessive UV-radiation with 2-4, 5-6, or 7-8 minimal erythematous doses (MED) on man's health condition was investigated, when the irradiated surface area made 20% or 50% of the body surface area. Before and 1 or 3 days after exposure the following parameters were measured: skin state, skin perspiration, body temperature, fluid consumption, diuresis, ECG, PCG, occlusion plethysmography. The observations allowed the conclusion that 5-8 MEDs were threshold doses inducing early intoxication in response to local irradiation (20% of the body surface area) and upper body irradiation (50% of the body surface area).

[Dynamics of changes in the fluids of the extremities in man in different body positions].

Anthropometric measurements and occlusion venous plethysmography were used to investigate fluid inflow and outflow in the limbs of human subjects who kept normal motor activity for 4 hrs, remained in recumbency or were in the head-down position at an angle of -12 degrees and -22 degrees (to simulate effects of zero G). During these exposures diuresis, heart rate and blood pressure according to Korotkoff were also measured. In the horizontal and, to a greater extent, head-down position, when motor activity was diminished, volume blood flow velocity in the limbs decreased, i.

[Vascular mechanisms of adaptation to head-down tilt body posture].

Using occlusion plethysmography and rheography, the state of peripheral circulation of 18 test subjects during 25 exposures to head-down tilt was investigated. The test subjects were subdivided into two groups: nine subjects actively changed their body position by 90 degrees and nine others were passively transferred to the head-down position at an angle of -12 degrees. It was found that regular training facilitated the development of vascular mechanisms which assisted adaptation to the head-down tilt: it decreased the tone of resistance vessels of the arms and legs and that of capacitance vessels of the legs; it increased the tone of cerebral resistance and capacitance vessels.