[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.

[Effects of medicinal plant species on gymnasium pupils' cardiac performance under exam stress].

The use of antistress tea from the medicinal herb species "Treasure of Nature" as a dietary supplement (DS) by pupils in the exam period causes positive changes in their psychophysiological status, reduces the magnitude of sympathoadrenal system tension, and exerts an optimizing effect on the mechanisms responsible for regulation of the cardiovascular system. In this connection, in addition to other DSs, the above species may be recommended for use as a non-specific adaptogen under stress.

[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.

[Change in salivary nitric oxide levels in students in the examinational period].

The influence of examination-induced psychoemotional stress on hemodynamic parameters and salivary nitric oxide (NO) levels was studied in students. Before examinations, the examinees with a sympathotonic response (75.0%) were observed to have diminished salivary NO excretion that was retained within 24-hours after an exam. There was a significant negative correlation between the amount of NO and the values of blood pressure. The examinees with a parasympathetic response (25%) were found to have elevated salivary NO levels with lowered blood pressures in the pre- and postexaminational periods.

[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.

[Hemodynamic parameters in schoolchildren under examination stress].

During examinations, cardiovascular and mental changes were studied in schoolchildren studying in middle (5-7) forms with a differentiated form of teaching. Cardiac hemodynamic values were calculated and a psychological testing for anxiety was performed in the examinees. During an examination session, the schoolchildren were ascertained to develop emotional stress characterized by a complex of psychophysiological and autonomic nervous changes.

[The functional status of students carrying a mental load].

The paper shows psychological and cardiac hemodynamic changes in students performing an hour mental test of a program on a computer. There are synchronous reductions in the magnitude of cardiac hemodynamic indices and in the activity of the sympathetic pattern of cardiac rhythm regulation in the examinees.

[Influence of mental and emotional stress on the levels of electrolytes in the saliva of senior schoolchildren]. / Vliianie umstvenno-émotsial'nogo napriazheniia na soderzhanie élektrolitov v sliune starsheklassnikov.

Salivary Na+,K+-excretory function was studied in senior schoolchildren-entrants during an academic year and entrance examinations. The time course of changes in the salivary levels of Na+ and K+ in entrants during an academic year was undulating. In late October that is coincident with the beginning of lessons given by tutors, the salivary content of Na+ reduced while that of K+ increased. The second peak of decreased excretion rates for Na+ and increased excretion rates for K+ and that of less Na+/K+ ratios was observed in May on the eve of entrance examinations. On the eve of the examinations, 70% were observed to have tachycardia, elevated levels of integral parameters of cardiac rhythm regulation, a considerable reduction in the concentration of Na+, and an increase in the level of K+ with less Na+/K+ ratios. The pattern of the observed changes also retained in the postexamination period. On the eve of the examinations, 30% were found to have lowered levels of integral parameters of cardiac rhythm regulation and elevated levels of Na+. After an examination, there was a reduction in Na+ excretion which did not yet achieve the initial level. The mechanisms responsible for ionic shifts in the composition of saliva during psychoemotional stress are discussed.

[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.

[Effects of hydrocortisone and insulin on the electrokinetic potential of hepatocyte nuclei]. / Elektrokineticheskii potentsial iader gepatotsitov pri vozdeistvii gidrokortizona i insulina.

The electrokinetic potential of liver cell nuclei of rats after the in vivo separate and joint injection of hydrocortisone and insulin was determined. It was shown that the steroid induces a significant elevation of the value of electrokinetic potential while insulin does not change this parameter. An insignificant elevation of the potential by the joint action of the hormones was found, which apparently is indicative of the antagonism between hydrocortisone and insulin.

[Shifts in phospholipid composition of the nuclear matrix in rat liver cells exposed to insulin]. / Sdvigi v sostave fosfolipidov iadernogo matriksa kletok pecheni krys pri vozdeistvii insulina.

It was shown that the total content of phospholipids of rat liver nuclear matrix increased after in vivo action of insulin (2 units per 100 g of animal weight). At the same time the sphyngomyelin content was increased and the content of phosphatydilcholine and phoshpatydilinositol was decreased significantly under the hormone action. The decreasing of monophosphoinositides amount was accompanied by the increasing of triphosphoinositides content which indicates the redistribution among the phosphoinositides fractions under the hormone action and may be the result of insulin initiation of phosphoinositide pathway in nuclear membrances.