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Biomedical subjects

N N Vasilevskiĭ

Publications and source records attributed to N N Vasilevskiĭ.

At least 19 recordsLinked to original sources
PubMed1994

[The physiological problems of biofeedback control by the heart rate].

The data on voluntary regulation of the heart rate in humans is given in respect to individual-typological differences of adaptive abilities, ecological specifics of ambient environment and labour, health condition (neuroses, vegetative-vascular dystonias etc.). A major role of training of the rhythmic regulatory processes for the biological feedback control, is corroborated.

Antarctic Regions↗
PubMed1991

[Surgical treatment of habitual dislocation of the shoulder].

In the article is presented the analysis of treatment of 32 patients with shoulder joint instability. There have been studied the outcomes of treatment after the arm "suspension" operations, interventions at the anterior region of an articulation, derotational osteotomies of an arm. There have been considered the problems of etiopathogenesis of shoulder joint instability. There have been analyzed the peculiarities of the tactical approach to the treatment of patients with shoulder joint instability. There is presented the principled position of the authors' approach to the selection of pathogenetically substantiated method of the habitual shoulder slip operative treatment.

Adolescent↗
PubMed1990

[Various prerequisites for performing the Sach-Weber operation in anterior instability of the shoulder joint].

The authors present a preliminary analysis of the treatment of the patients with anterior instability of the shoulder joint who were given surgical treatment consisting in subcapital rotation osteotomy of the humerus and tendinous-capsular plasty of the anterior portion of the shoulder joint. The surgical technique and the indications for the operation are presented.

Adolescent↗
PubMed1990

[Systematic analysis of the state of man exposed to radio wave irradiation for a long time].

A complex examination was made of 72 men--short-wave (3-30 MHz) radio equipment controllers. Two parallel control groups of 70 people all in all were examined. No regular changes in the dynamics of amplitude-frequency characteristics of electroencephalogram, associated with the length of service, were observed. The number of subjective complaints from people in contact with radiofrequencies increased with an increase in the length of service. The role of certain clinico-physiological parameters of the organism in the process of adaptation to electromagnetic radiation was quantitatively assessed with the use of status-metry technique; in particular, a decrease in the functional activity of the right hemisphere brain structures, aggravating with the length of service, was observed.

Adult↗
PubMed1989

[Experimental analysis of biological effects of microwaves: their systemic, ultrastructural and neuronal mechanisms].

For 200 hours the cats were exposed to microwaves of 2375 mHz, the energy current density being 500 mWt/cm2. 6 diversions of the electrocorticogram and multi-cellular activity were registered by coal electrodes. After the exposure an electro-microscopic study of the lateral hypothalamic brain field was carried out. Under the radiation effect synchronization of slow bioelectric activity over the range of 6-10 to 12-16 took place. The analysis of the conditional probability matrix of series generation of action potential in the studied structures demonstrated their functional separation according to multi-cellular activity parameters in proportion to exposure growth. Damage of axodendritic synapses which provided morphologic links between brain structures was considered its morphologic substrate.

Action Potentials↗
PubMed1989

[The biorhythmological mechanisms of the adaptive self-regulation of functions: the connectedness and cyclicity of intercomponent and intersystem interactions].

The paper summarizes studies carried out in the Dept. of Ecological Physiology of the Inst. Exptl. Med. and stemming from the D.A. Biriukov works. Biorhythmological basis of the mechanisms of adaptive self-regulation of functions is revealed. This enables to evolve new approaches to estimation of individual human adaptive features and of the ways of functional nonpharmacological correction of functions by means of the feedback biocontrol of neural, vegetative and somatic functions. The results of the studies have advanced human psychophysiology and found some practical application in medicine.

Adaptation, Physiological↗
PubMed1989

[Cyclic interactions in the processes of adaptation regulation].

Human adaptation is characterised by essential changes of functional systems biorhythms which appears in the changes of their components' sequence and in the dynamics of biorhythmological cycles. These objective laws, having been described for human EEG, allow to discern clearly the individual-typological peculiarities in man with different stages of adaptation, the same as the adaptive shifts during long-term influence of external factors. The cyclic course of adaptative processes is regarded as a measure of adaptability. With the help of biorhythmic multitude the memory is constantly satiated from the brain by discrete portions of adaptogenic information, which prevents the natural processes of the memory disintegration.

Adaptation, Physiological↗
PubMed1984

[The comprehensive approach in ecological physiological research (on the 80th birthday of D. A. Biriukov)].

Some aspects of complex studies of human ecological physiology started by D. A. Biriukov, are presented. Further development of these studies involved investigation into both the general physiological regularities of adaptation and its individual-typological differences in humans. These works were performed with the aid of analysis of bio-rhythmological structure of neural and vegetative processes and connection among separate components of the bio-rhythms of these processes which made it possible to define stages of adaptation and individual features of human organism's adaptation. D. A. Biriukov's idea of the ecological adequacy of signals (the system of ambient factors) is elucidated. Prospects of further investigations are determined.

Adaptation, Physiological↗
PubMed1984

[Systems approach to the stability and plasticity of neurophysiological processes during the adaptive activity of the brain].

The problem of stability and plasticity of regulatory processes is presented from the standpoint of N. P. Bechtereva's theory of stable pathological state, rigid and versatile links in regulating systems, and the necessity of probabilistic approach is emphasized. Data on connection among separate components of biorhythms in physiological systems and on stability of their frequency-amplitude parameters, are reviewed. The data obtained reveal advantages of using functional bioregulatory feedback methods in clinic.

Adaptation, Physiological↗
PubMed1984

[Effect of microwaves on work capacity and impedance of the brain structures of rats].

Adaptive processes occurring in white rats in response to microwave irradiation with non-thermogenic density, were studied as well as the maximal working ability of the animals, the impedance of their sensomotor cortex, hypothalamic nuclei and cerebral tissues, skeletal muscles and liver. Probable physiological mechanism of the observed effects is discussed.

Adaptation, Physiological↗
PubMed1981

[Interaction of brain structures regulating the vocal and respiratory systems].

Unit activity data revealed an obvious interrelationship between the brain vocal and respiratory systems. Modification of evoked reaction of the vocal system depends on stimulated central nuclei and parameters of stimulating electric current. The threshold of evoked vocal reaction is higher than the threshold sufficient for modification of respiration and neuronal activity. The data obtained suggest that not all the structures related to the respiratory regulation bear control over the generation of species specific cries.

Animals↗
PubMed1981

[Cyclic interaction of brain structures in different states and different types of activity].

Special method of multichannel EEG analysis with the aid of the matrix of consistent zero-crossing points distribution within the multichannel EEG registration calculated for the different functional states and behaviour revealed the cyclic forms of bilateral interrelationship between the brain structures. The variety of consistent connections increases in EEG-biofeedback food behaviour and visual stimulation, but the cycles prolongation decreases. The combination of zero-crossing points consistently distributed for different brain structures is typical for each functional state.

Animals↗