


Том 49, № 2 (2023)
Articles
Search for Functional Markers of the Hippocampus Including in the Pathological Process
Аннотация
We studied the features of EEG and visual memory processes in 27 patients with a mediobasal regions extracerebral tumor of right and left hemispheres. According to neuroimaging (MRI) and morphometry, the degree of hippocampus involvement in pathological process was assessed. The predominant concentration of irritative-epileptiform signs in the affected hemisphere, as well as the presence of atypical alpha-rhythm episodes in the tumor projection zone, were classified as EEG markers of tumor compressive effect on the hippocampus. Signs of non-identical involvement of the right and left hippocampi in the pathological process were found in the form of a predominance of irritative signs in the left hemisphere throughout the group as a whole. Equivalent dipole sources (EDS) of atypical alpha rhythm are more confined to hippocampal structures than irritative EEG patterns. Neuropsychological testing of visual memory did not reveal significant disturbances in memory processes at this stage of the disease.



Neurophysiological Parameters in Patients after Coronary Bypass Grafing Depending on the Success of Rehabilitation Using the Dual Task Method
Аннотация
The impact of cognitive rehabilitation using the method of dual tasks on the neurophysiological parameters of patients with postoperative cognitive dysfunction (POCD) in the early postoperative period of coronary artery bypass grafting (CABG) under cardiopulmonary bypass was analyzed. The study included 96 male CABG patients. All the patients underwent a detailed neuropsychological and electroencephalographic study before and after CABG. At 2–3 days after surgery, POCD was diagnosed all patients, and they were randomly divided into two groups: with training (n = 54) and without training (n = 42). Starting from 3–4 days of the postoperative period, a daily course of cognitive training was carried out using a dual task (simultaneous performance of the cognitive and physical components). The POCD diagnosis was repeated at the end of the training course (8–11 days). It was found that patients who successfully completed the training (with no POCD at 8–11 days) demonstrated a decrease of the theta-1 power, while in all patients with POCD these indicators increased compared to preoperative data. The topographic features of theta1 rhythm changes were found in the left parietal areas of the cortex, which may indicate impaired perfusion in these regions of the brain.



Dynamics of Changes in Muscle Architecture, Force, Strength-Velocity Properties of the Muscles of Lower Limbs in Humans under the Influence of a Three Week Unloading
Аннотация
The present study examined the hypothesis that significant alterations in antigravity muscle architecture would occur with dry water immersion (DI) and that some structural changes may be seen in postural muscles because of the overall decrease in physical activity. Ten men (age (mean ± SE) – 24.5 ± 3.9 years, height – 176.1 ± 1.2 m, mass – 71.1 ± 3.4 kg) volunteered for the study. The healthy men underwent of DI for 21 days. All subjects did not use physical training during the exposure. The contractile properties of the muscle ankle extensors and flexors (maximal voluntary contraction (MVC) and strength-velocity relationship) were evaluated using an isokinetic dynamometer. The internal architecture of the triceps surae muscle of its two heads (medial (MG) and lateral (LG) gastrocnemius muscles) was determined by in vivo ultrasound (US) at ankle angles of –15° (dorsiflexion), 0° (neutral anatomical position), and +30° (plantarflexion) with an angle in the knee joint of 0°. In each position, longitudinal US of MG and LG were obtained at the proximal levels 30% (MG and LG) of the distance between the popliteal crease and the center of the lateral malleolus. US images were detected at rest for each ankle position, and the fiber length (Lf) and pennation angle (Θf) relative to the aponeurosis were determined. After DI the MVC muscle ankle extensors decreased from 122.6 ± 43.1 to 99.5 ± 22.7 N (19%). Although there was a significant no change in dorsiflexion. After DI with the ankle angle increasing from –15° to +30°, Lf changes from 43 ± 1 to 32 ± 2 mm (25.6%, p < 0.01) for MG and from 45 ± 2 to 34 ± 1 mm (24.4%, p < 0.01) for LG, and Θf increased from 21° ± 1° to 26° ± 2° (23.8%) for MG and from 14° ± 1° to 18° ± 2° (28.6%) for LG. Collectively, the present data suggest that the architecture and contractile capacity of human pennate muscle are interrelated, in vivo. The finding that amongst the antigravity muscles, the MG deteriorated to a greater extent than the LG is possibly related to the differences in relative load that this muscle possibly experiences during daily loading. Different Lf and Θf, and their changes by after unloading, might be related to differences in force-producing capabilities of the muscles and elastic characteristics of tendons and aponeuroses. Structural muscle changes can be considered as an adaptive process, in response to disuse.



Eight-Week Aerobic Training Activates Extracellular Matrix Biogenesis in Human Skeletal Muscle
Аннотация
We aimed to investigate the effect of 8 weeks of moderate endurance training without considerable mechanical stress on the activation of extracellular matrix (ECM) gene expression in human skeletal muscle. Mechanical stress activates ECM biogenesis in the skeletal muscles, therefore only aerobic exercise on a cycling ergometer with concentric muscle contractions was used in the study. Skeletal muscle samples from m. vastus lateralis were taken from seven young untrained males before and after 8 weeks of aerobic training. Changes in the transcriptome (RNA sequencing) and proteome (shotgun quantitative proteomics analysis) were assessed in the samples; ECM-associated proteins (or matrisome) were determined using the Matrisome DB database. After training period, a change (mainly an increase) in the content of 14 ECM proteins and 134 mRNAs of ECM proteins was found. The largest increase in protein content was found for collagens 1 and 3 (1.7 and 2.2 times, respectively) – the main proteins of the human skeletal muscle’s ECM, which was consistent with an increase in the corresponding mRNA by 10–20 times. In addition, an increase in the expression of more than a hundred mRNAs of collagens, glycoproteins, proteoglycans, and enzymatic regulators of ECM was found, which occurs simultaneously with of an increase in the expression of genes of growth factors (IGF1, PDGFs, TGFB1, MDK, etc.) playing an important role in ECM biogenesis regulation. In conclusion, 8-week aerobic exercise training without considerable mechanical stress is a powerful stimulus for the activation of ECM biogenesis in skeletal muscle.



Effect of Simulated Hypomagnetic Conditions on Some Physiological Paremeters at 8-Hour Exposure. Experement “Arfa–19”
Аннотация
The proposal is a complex experiment that had a design – a double-blind randomized placebo-controlled study. An effective measurement of the parameters of the human body was examined on 8 apparently healthy subjects during an exposure of 8 hours in altered magnetic conditions. The results of the experiment did not reveal significant risks for the functional state of the human body with a decrease in the multiplicity of about 1000 times.



Features of the Influence of the Autonomic Nervous System on the Regulatory and Metabolic Parameters of Lymphocytes in Healthy Children and Children with Special Health Abilities
Аннотация
The aim of the study was to study the content of biogenic monoamines (catecholamins and serotonin) and metabolic parameters (activities of succinate dehydrogenase and acid phosphatase) of lymphocytes in normal children and in children with special health abilities, depending on the type of autonomic regulation. The survey involved 168 children of primary school age, of these, 114 relatively healthy children and 54 children with intellectual disabilities (mild (F70) and moderate (F71) degree of mental retardation). The groups were comparable in terms of gender and age. In both studied groups, an increase in the parameters of succinate dehydrogenase and catecholamines from vagotonic to hypersympathicotonic types of the initial vegetative tone was recorded. Also, in the group of children with special health abilities, a decrease in the activity of acid phosphatase was found as the activity of the sympathetic division of the autonomic nervous system increased. In general, in healthy children, against the background of the prevailing eutonic type of autonomic regulation, the optimal regulatory and metabolic parameters of the cell are fixed, which determines sufficient adaptive responses in this group. In the group of children with disabilities, the dominant activity of the sympathetic division of the autonomic nervous system manifests itself at the cellular level as hypercatecholaminemia, reduced levels of serotonin and acid phosphatase activity.



Comparative Determination of Immuno-Biochemical Indicators in Patients with Cardiovascular Diseases
Аннотация
The development of new diagnostic methods for the prediction, treatment and prevention of cardiovascular diseases is an urgent task. The purpose of this study was to compare specific immunological and clinical-biochemical markers in patients with cardiovascular diseases. In accordance with the established diagnosis, three groups of participants were examined – a total of 139 people, including the control group. The first group was patients with hypertension, the second group – with a diagnosis of hypertension and coronary heart disease. In these patients, biochemical parameters of blood and antibodies to β-endorphin, bradykinin, histamine, dopamine, and serotonin, traditionally used in diagnostic practice, were compared. Deviations of 38–65% in the content of antibodies to dopamine and serotonin were found for patients of the first and second groups compared with the control. A correlation of immunological parameters with biochemical and hematological parameters was found. A direct relationship was found for the level of antibodies to dopamine and AST activity (r = 0.4, p < 0.05), to histamine and ESR concentration (r = 0.6, p < 0.05). Thus, the practical significance of the combined use of tests for assessing the violation of the immunological and biochemical homeostasis of the body of patients with heart disease has been established. Monitoring of additional immunological indicators to assess the development of the disease increases the degree of prognosis of the severity of the pathology.



КРАТКИЕ СООБЩЕНИЯ
Relationship between Dehydroepiandrosterone-Sulfate, Testosterone, Thyroid Hormones, Insulin and Cortisol in Indigenous Men and Women among Representatives of the Indigenous and Newcomer Population of the Yamalo-Nenets Autonomous Okrug
Аннотация
Using Spearman’s rank correlation we studied the correlations between the serum dehydroepiandrosterone-sulfate (DHEA-S) concenttration and the concentration of testosterone, thyroid-stimulating hormone, thyroxine, triiodothyronine, insulin and cortisol in the indigenous and alien populationof the Yamal-Nenets Autonomous Okrug. A positive correlation was found between the DHEA-S concenttration and testosterone in indigenous women and newcomers. A stronger correlation was found in the group of newcomer women. In indigenous men, DHEA-S was positively correlated with cortisol. The newcomer men showed a positive correlation between DHEA-S and thyroid-stimulating hormone. No correlations were found between the concenttration of DHEA-S with insulin, thyroxine and triiodothyronine in any of the examined groups.



ОБЗОРЫ
Cognitive Functions of the Brain: a Review of Research in Weightlessness
Аннотация
The review is devoted to the role of gravity in the implementation of human cognitive functions. The influence of weightlessness on various aspects of cognitive activity is considered, such as the choice of a vertical, the formation of a reference system, including the time coordinate, the recognition of the symmetry of complex shapes, the processes of memorizing and recognizing images, and orientation in three-dimensional labyrinths. It is described how the EEG activity of the brain in response to visual stimuli changes in weightlessness. It is shown that in weightlessness there are not only changes in the work of reflex mechanisms, but also restructuring at the level of the cognitive system, in particular, “reprogramming” of sensorimotor systems, and the development of new skills for the functioning of the brain in changed conditions.



Integration of Vestibular, Visual and Proprioceptive Inputs in the Cerebral Cortex during Movement Control
Аннотация
The review of the literature data is devoted to the integration of vestibular, visual and proprioceptive inputs in various areas of the cerebral cortex in humans and monkeys during movement control. Despite the abundance of studies of numerous areas of the cortex with vestibular and sensorimotor inputs, their functions and connections are insufficiently studied and understood. The review provides a relatively detailed analysis of data from recent studies of three areas of the cortex involved in motion control: region 7a of the posterior parietal cortex, in which responses to a combined visual-vestibular stimulus tended to dominate the vestibular input over the visual one; the visual region of the cingulate sulcus, which presumably integrates not only visual and vestibular afferent signals, but also proprioceptive signals from the lower limbs, thereby providing interaction between the sensory and motor systems during locomotion; and the area of the superior parietal lobule, in which the visual and somatic inputs interact, allowing you to control behavior when reaching and grasping an object. It is concluded that it is necessary to combine complex natural tasks with normative behavioral models in future research in order to understand how the brain converts sensory input data into a behavioral format.



Mechanics of the Left Ventricle in Children Born Prematurely
Аннотация
An increase in the birth rate of premature and low birth weight children at the current level of medical development requires the development of fundamental ideas about the physiology of the cardiovascular system in a history of preterm birth from the point of view of pre- and postnatal ontogenesis. Practicing neonatologists, pediatricians, therapists, cardiologists, reproductologists, etc. it is necessary to improve the traditional ideas about the mechanisms of damage to the cardiovascular system in this category of patients. Because it is established that this clinical subgroup is characterized by increased risks of early onset of pathology of the heart and blood vessels, as well as a high mortality rate in adulthood. Pathological changes of the cardiovascular system in conditions of prematurity can occur at various levels of integration of the body (molecular, subcellular, cellular, organ, functional systems, organismal). The use of modern non-invasive technology “spot trace” makes it possible to study the features of segmental deformation and the variety of forms of LV torsion mechanics during postnatal growth and development in prematurely born children. Optimization of research and diagnostic processes in the field of mechanics of the infant heart in the prenatal and postnatal periods from the point of view of progressive data on anatomy, histology, clinical biochemistry allows us to study the nature of various contractile-rotational models, as well as reasonably assume the contribution of the fibrous skeleton of the infant heart to the formation of “childhood types” of left ventricular twisting. The search and development of informative criteria for the early diagnosis of latent subclinical heart dysfunction in childhood, taking into account the possibilities of non-invasive ultrasound technology “spot trace” (analysis of types of rotational movement, determination of areas of reduced longitudinal deformation of the left ventricle), based on the current provisions of evidence-based medicine, have become quite possible in modern conditions and are demonstrated by the authors in this review. The information offered to the readers will allow to expand the understanding of the physiology and pathophysiology of the infant heart with a history of premature birth, bearing in mind the fact that prematurity is considered a chronic condition.



Individual Lifestyle and Male Fertility
Аннотация
Over the past decades, there has been a significant decline in the birth rate in many countries raising the question of the role and degree of involvement of biological factors in this process. Up to 30% of couples of reproductive age have fertility problems, and in half of the cases, the cause is the male factor. However, up to 40% of cases of male infertility are idiopathic, i.e. with unexplained causes. More and more evidence suggests that environmental factors are the causes of growing male infertility and subfertility, among which the individual lifestyle seems to be the most significant. Many researchers believe that lifestyle factors make a significant contribution to the existing negative trend of global decline in male reproductive potential. The main factors of an individual lifestyle that cause a weakening of male reproductive health are considered to be obesity, nutrition, physical inactivity, smoking, excessive alcohol intake, psychological stress, low-level radio-frequency electromagnetic fields (mobile telephones and portable computers), aging and others. Many factors of an individual lifestyle can reduce the sperm production, mobility and normal morphology, increase damage to the DNA of spermatozoa, and have a negative impact on the endocrine control of reproductive function, which can lead to male subfertility and infertility. In recent years, a significant amount of data has been accumulated that allows us to create an exhaustive and multifaceted picture of the lifestyle effects on the male reproductive function. This review focuses on the negative impact of the most common factors: obesity, diet, sedentary lifestyle, smoking and alcohol consumption on spermatogenesis and the profile of reproductive hormones in men.


