[EFFECT OF VOLUNTARY BREATH-HOLDING AND COGNITIVE LOADS ON REGIONAL CEREBRAL BLOOD FLOW AND BIOELECTRIC ACTIVITY OF THE BRAIN].

Cerebral blood flow and bioelectric activity were studied in 10 normal volunteers in order to assess cerebrovascular reactivity during different types of functional testing. The transcranial Doppler was used to measure linear blood velocity (LBV) in the middle cerebral artery (MCA) during maximal voluntary breath-holding (apnea), controlled verbal association test and tactile memory test. Simultaneous electroencephalography (EEG) registered the bioelectric activity of the brain cortex.

[Behavioral characterictics of ISIAH rat strain].

This work was performed in hypertensive ISIAH and normotensive WAG rat strains. The latter was used as a control group. The general evaluation of behavior of the ISIAH and WAG rats tested in the open field, in the light-dark test, in the sound stress test, and in the fatigue test showed that the motor and exploratory activity provoked by an unfamiliar environment was much higher in the ISIAH rats as compared to the control WAG strain.

[Investigation of peripheral hemodynamics with the use of ultrasonic dopplerography under the conditions of 7-day immersion].

Ultrasonic dopplerograpy of peripheral, including transcranial, blood circulation was performed in 8 normal volunteers for 7-day dry immersion experiment. Linear blood velocity (LBV) was measured in main arteries and veins of the head and lower extremities. Investigations were conducted on days 2 and 5 of immersion and on day 2 of recovery.

Functional activity of the sympathoadrenal system in hypertensive NISAG rats.

NISAG rats with stress-induced arterial hypertension are characterized by hyperactivity of the sympathoadrenal system under rest conditions and during stress exposure.