[Correcting influence of music on the students' functional state].

The influence of listening to classical music on integral indices of the activity of the regulatory mechanisms of the heart rhythm in students after teaching load was tested with the method of variational pulsometry accordingly to R.M Baevsky procedure. Registration and analysis of ECG was realized on Pentium 4 in three experimental situations: before the start of lessons (norm), after lessons, after listening to the music. Two types of response of students 'functional state to the teaching load: sympathetic and parasympathetic have been established. After teaching load music therapy session was found to led to the shift of levels of all examined indices of heart rhythm toward the original data (norm), most expressed in students with a sympathetic response type.

[Antitoxic influence of taurine].

The investigation of single injection of taurine on Lebetina viper' venom-induced shifts of morpho-functional indices of rats' peripheral blood was carried out. It was revealed that taurine eliminates negative effects of influence of venom. The results of investigation allow us to assume that taurine trigger adaptive and compensatory mechanisms of organism in conditions of toxins influence.

[Morphofunctional parameters as criteria for assessing the students' adaptation to graded physical exercise].

Short-term physical exercise (Roufie test) was studied for its impact on the physiometric and functional parameters of first-year students engaged in a basic physical training group. According to the reaction to exercise and gender, the authors formed 3 groups: (1) girls with excellent performance after Roufie-Dixon; (2) girls and boys with good performance; (3) girls and boys with satisfactory performance. The changes in the study parameters indicated that the Roufie exercise test was adequate for Group I girls and Group 2 boys, in whom the adaptive potential after exercise was in the range of adaptive changes. In the other groups, short-term physical exercise led to adaptive potential transition toward the tension area. The changes of other study parameters were adequate to those in the adaptive potential during an exercise test.

[Impact of exercise on cardiac hemodynamic parameters in students].

Functional changes were studied in first-year students performing exercises. Analyzing the findings indicated that a 500-m race caused unidirectional varying changes in young women and young men. The functional systems of the first-year students responded to strenuous exercises due to the tension of cardiac rhythm regulatory mechanisms, which manifested itself as almost 4.5-fold increase in the activity of the sympathetic regulatory circuit. Excessive tension that was a result of long-term inactivity may be further a cause of disproportionally developed cardiac chambers, leading to myocardial hypertrophy, cardiac arrhythmia, weakened valvular apparatus.

[Changes of morphological indicators of blood from vibration and liquorice effect].

The effect of long-term exposure of vibration and feeding rabbits with liquorice (Glycyrrhiza glabra L) on peripheral blood indicators was studied. It was found that biological active substances of licorice accelerate metabolism processes of the marrow stem cells, enlarge organism compensatory abilities, in that way providing organism resistance to vibration.

[Cardiac rhythm in pupils during tests].

Variation pulsometry was used to study changes in the activity of cardiac rhythm regulating mechanisms in third-form pupils from a comprehensive school (a control group) and a gymnasium (a study group) under mental stress caused by the performance of mathematical tests. Two types of responses of the studied parameters: sympathetic (in the study group) and parasympathetic (in the control group), which were determined by the richness and intensity of an academic load and by the readiness of both categories of school-children, were identified.

[Change of cardiodynamic parameters and the heart rhythm in students under influence of the academic load].

Dynamics psychological and cadriohemodynamical parameters and activity regulators mechanisms of a rhythm of heart of students in current of academic year is studied. It is shown, that process of adaptation of students to an academic load is accompanied by the periods of recession and a pressure parameters of hemodynamic, activity regulators mechanisms of a rhythm of heart and parameters of state of health, activity and mood. The periods of the highest pressure of physiological systems of an organism of students are the beginning of the first semester and the examination period. The adaptive changes of investigated parameters occurred in the course the academic year.

[Influence of cognitive and psychoemotional loads on the cardiac hemodynamic parameters of enrolling students]. / Vliianie umstvennykh i psikhoémotsional'nykh nagruzok na kardiogemodinamicheskie pokazateli abiturientov.

Psychophysiological and cardiac hemodynamic changes were studied by computer registration and an analysis in tenth formers-entrants having a higher mental and emotional load during a school year. The changes in the above parameters were also studied when the formers were taking their school-leaving and entrance examinations.

[The influence of examination stress on psychophysiological characteristics and heart rate in students]. / Vliianie ékzamenatsionnogo stressa na psikhofiziologicheskie pokazateli i ritm serdtsa studentov.

With the aim to assess the influence of pre-examination psychoemotional stress on the level of centralization of the heart rate control, mathematical analysis of ECG of students was performed in normal condition (a common day of academic semester), before, and after an examination. The ECG was recorded and processed with the help of IBM-486 PC. R-R cardiointevalograms were processed by the method of variational pulsometry after Baevsky. Common quantitative heart rate indices were studied. The level of anxiety of students was assessed by Spilberger, and subjective estimations of general condition, activity and mood were obtained from the respective questionnaire. Three types of heart rate reactions on the examination stress were revealed. The reactions depended on the individual typological characteristics and the state of autonomic nervous system.

[Changes in psychophysiological variables in students during examinations]. / Izmeneniia nekotorykh psikhofiziologicheskikh pokazatelei studentov v period ékzaminatsionnoi sessii.

Current psychological tests and classic methods for recording and calculating autonomic correlates were used to study changes in students' psychophysiological indices during examinations. During this period, the students were found to develop emotional stress characterized by a complex of psychophysiological and autonomic changes. The nature and direction of the latter were determined by the individual and typological properties the examinees, by the significance of the emotional and stress situation of the autonomic nervous system and its responsiveness.

[The role of the thalamic ventrolateral nucleus in the cortical effect on the activity of vestibular neurons]. / Rol' ventrolateral'nogo iadra talamusa v realizatsii kortikofugal'nogo vliianiia na aktivnost' vestibuliarnykh neironov.

Electrocoagulation of lateral vestibular nucleus (NVL) reduces inhibitory effect of the motor and somatosensory areas and enhances the inhibitory effect of limbic, vestibular, and orbital cortical areas. Facilitating effect was enhanced by electrostimulation of the motor area and reduced by the stimulation of other cortical areas. Following the coagulation of the NVL, the ascending afferent flow to the cortex seems to be reduced. This results in diminishing of the cortical neurones tone and readjusts the descending influences upon the NVL neurones activity.

[The hypothalamic regulation of the activity of vestibular neurons during exposure to vibration]. / Gipotalamicheskaia reguliatsiia aktivnosti vestibuliarnykh neironov pri vozdeistvii vibratsii.

In acute experiments in rabbits the influence of stimulation of the ventromedial hypothalamic nucleus on the activity of neurons of vestibular Deiters' nucleus was studied under conditions of 15-day exposure to vibration (60 Hz, 0.8 mm, 3 h daily). The mechanisms are discussed which underlie the observed phenomena.

[The effect of stimulation of the amygdala basolateral nuclei on the neuron activity of Deiters vestibular nuclei in rabbits]. / Vliianie stimuliatsii bazolateral'nykh iader mindalevidnogo kompleksa na aktivnost' neironov vestibuliarnogo iadra Deitersa u krolikov.

A modulating character of the amygdala basolateral nuclei effect upon the vestibular sensory system was determined in rabbits [correction of rats]. A mechanism of the descending effect of the amygdaloid complex on the activity of the Deiters nucleus neurons, is discussed.

[Limbic mechanisms regulating vestibular neuron reactions in vibration]. / Limbicheskie mekhanizmy reguliatsii vestibuliarnykh neironnykh reaktsii pri vibratsii.

Acute experiment on rabbits (extracellular registration) studied influence of limbic cortex on neuron activity of Deuters nucleus before and after exposure to low-frequency vibration (5 Hz, 30 minutes). The authors discuss mechanisms underlying changes in activity and response of vestibular neutrons to electric simulation (5 and 60 Hz) of limbic cortex before and after vibration.

[Response of the hypothalamic neurons to stimulation of the vestibular nerve and lateral vestibular nucleus in rabbits]. / Reaktsii neironov gipotalamusa na stimuliatsiiu vestibuliarnogo nerva i lateral'nogo vestibuliarnogo iadra u krolika.

Effects of single, double, and rhythmic stimulation upon hypothalamic neurons responding to the 1st excitatory phase of lateral vestibular nucleus stimulation, were studied. The data obtained show that activation of some hypothalamic neurons following stimulation of the lateral vestibular nucleus has a monosynaptic character. The findings suggest that ascending afferents from the lateral vestibular nucleus to the hypothalamus pass via oligo- as well as polysynaptic pathways.

[Cortical mechanisms of regulation of neuron activity of Deiters vestibular nucleus during vibration]. / Korkovye mekhanizmy reguliatsii aktivnosti neironov vestibuliarnogo iadra Deitersa pri vibratsii.

The peculiarities of the effect of vestibular, somatosensory, motor and limbic areas of brain cortex on the activity of neurons of lateral vestibular nucleus (LVN) are studied in the nembutal and chloralose anesthetized rabbits by the extracellular lead method before and after vibration exposure. It is found that the responses of neurons of Deiters's nucleus at all frequency ranges to stimulation of different areas of the cortex were predominantly of inhibitory type, being more pronounced during stimulation of the vestibular and motor areas. The facilitating corticofugal effect was noted in 20-30 % of cells and more pronounced influence was during stimulation of somatosensory and limbic areas of the cortex. During vibration there was a multidirectional effect of cortical areas on the neuronal activity of LVN. The vibration stimulus decreases an inhibitory effect and increases stimulating influence of vestibular cortex on the activity of Deiters's nucleus. The noted effect was more pronounced in neurons with low frequency of initial activity. On stimulation of other areas of the cortex an increase of inhibitory and suppression of facilitating descending effects were noted. The greatest amount of inhibited neurons was recorded during stimulation of motor cortex. The peculiarities and functional significance of the observed effects are discussed.

[The effect of stimulation of the vestibular area of the cortex on the neuronal activity of the lateral vestibular nucleus during vibration]. / Vliianie razdrazheniia vestibuliarnoi oblasti kory na aktivnost' neironov lateral'nogo vestibuliarnogo iadra pri vibratsii.

In rabbits, the effect of stimulation of cortical vestibular area upon neuronal activity in the lateral vestibular nucleus following vibration, was studied. The long-term vibration weakened the inhibitory and increased the activating effects of corticofugal influence upon neuronal activity in the lateral vestibular nucleus.

[The role of specific and nonspecific afferent systems in the mechanism of the changes in cortical evoked responses during vibration]. / Rol' spetsificheskikh i nespetsificheskikh afferentnykh sistem v mekhanizme izmenenii vyzvannykh otvetov kory pri vibratsii.

The correlation in activity of specific and unspecific afferent systems was measured in mechanisms changing electrical activity of the cortex during vibration. The character of postvibration shifts of vestibulo-, reticulo-cortical EPs was studied by means of isolated and combined exclusion of specific (vestibular) and unspecific afferent systems of the brain. The vestibular afferents seem to play a significant role in the mechanisms of postvibration shifts of vestibulo-cortical EPs. Impulses originating from the unspecific afferent systems, as well as proprioceptive, somatic and visceral afferents play similar role for the reticulo-cortical system.