[Use of dispersion analysis in the evaluation of the effects of immersion and individual differences on the variability of orthostatic reactions].

With the use of dispersion analysis the variation of indices of central and peripheral hemodynamics in healthy volunteers stayed from 1 to 7 days under conditions of "dry" immersion (DI) was studied. Nine persons were investigated at rest, 5 individuals during orthostatic tests before and after dry immersion sessions. The central hemodynamic indices were calculated, the arterial pressure (AD) was measured by Korotkoff's method, indices of rheoencephalographic and rheoplethysmographic indices of lower leg were found.

[Stress and blood circulation in man].

This paper presents the results of studying stress effects on the heart, systemic circulation and cerebral circulation by various methods (ECG, Doppler technique, isotopes, etc). Patterns of circulation changes in response to mental stresses have been identified and variations in circulation regulation as a function of stress enhancement have been revealed. Cerebral circulation changes produced by heavy mental work under stressful conditions are described (increase of blood flow velocity in carotid arteries and of tone of cerebral arteries of large and medium caliber, change in reactivity of anastomoses between branches of the internal and external carotid arteries, patterns of increase and decrease of blood flow in the gray matter of the brain cortex).