Heart rate variability and cortisol levels in school-age children with different cognitive tests

Background. An urgent task of age-related physiology is to study the functional state of the body of school-age children in cognitive activity due to the large academic load and the use of information and computer technologies in the educational process to identify the characteristics of the reactivity of the body of students when performing cognitive load of various types, including on electronic devices, is necessary for the organization of the school educational environment.The aim. To assess the nature of vegetative, cardiovascular and hormonal reactivity in cognitive load of various types in school-age children.Materials and methods. By methods of heart rate variability analysis, electrocardiography, tonometry and enzyme immunoassay of cortisol in saliva, 117 school-age children were examined while performing cognitive load of various types.Results. There is a change in heart rate variability indicators while performing cognitive load. Oral counting causes an increase in sympathetic influences on the heart rate with a decrease in parasympathetic activity, as well as a shift in the vagosympathetic balance. Operation on the electronic devices causes a decrease in the total power density of the spectrum and an increase in the index of low-frequency and highfrequency vibrations ratio due to a decrease in parasympathetic activity. Two types of reaction were revealed: type I – an increase in the concentration of cortisol in saliva, an increase in sympathetic effects on Heart rate with a simultaneous decrease in parasympathetic activity (counting), a decrease in the total power of the spectrum density (laptop), a decrease in parasympathetic activity (tablet). Type II – a decrease in hormone levels and a decrease in very low-frequency vibrations and parasympathetic activity, regardless of the type of load presentedConclusion. The results obtained indicate that the nature of the reactivity of heart rate indicators and the stress hormone cortisol in students depends not so much on which electronic device it is performed on, but on the type of cognitive load

Effects of hydrodynamic impact on water from the viewpoint of cluster theory. Surface tension

Variation of surface tension coefficient ? of distilled water under high-energy impact (hydrodynamic cavitation) was studied by the ring separation method. Force impacts on surface tension of water have been studied experimentally. Conditions have been found under which the surface tension coefficient ? decreases to 20%. The paper explains the produced results on the basis of cluster theory of water structure. The experimentally produced relaxation time of the surface tension of cavitation-activated distilled water to initial value has been found to be 3.5 hour

Nonequilibrium carbon black suspensions used in synthesis of polymer composite material

Nowadays polymer matrix-based composite material with various carbon fillers are widely used to protect radioequipment from different interference, to improve characteristics of radar absorbing coatings. Current synthesis processes are sophisticated and rather costly. The challenge is to develop new methods of producing composite materials by efficient knowledge intensive technologies to reduce the cost of products. The paper studies possibility of producing composite material on the basis of elastic polyurethane foam with carbon fillers using polyurethane impregnation in nonequilibrium black carbon suspension. Suspension composition: running water and carbon-bearing powders of nanometer range: fullerene black carbon, Taunite (multi-layer carbon nano tube material), technical carbon T900, wood soot. Nonequilibrium suspension was produced by treatment in hydrodynamic generator of rotor type (cavitation mode). Angular rotation speed of the rotor ω = 10000 rpm

LEVETINOL IN COMPLEX TREATMENT OF FOCAL EPILEPSY (EXPERIENCE OF EPILEPTOLOGIST IN OUTPATIENT NETWORK, MOSCOW)

Abstract: prescription of Levetinol in regimen of integrated adjunctive therapy in 30 patients with symptomatic and cryptogenic focal forms of epilepsy with poorly controlled seizures, receiving the reference probe of antiepileptic drugs, was accompanied by the attainment of a higher therapeutic effect. Remission with an average effective dose of the drug 1437.5 mg/day was observed in 6, reduction of attacks by 75% – in 8 patients. Levetinol significantly affect the indicators of anxiety and depression in the reduction of symptoms of affective disorders

Синдром Дайка–Давыдова–Массона: описание клинического случая, комплексная диагностика с применением видео-ЭЭГ-мониторинга, МРТ, МР-трактографии и фМРТ

Dyke–Davidoff–Masson syndrome is a possible cause of several pathologies and has rare appearance in clinical practice. One of these causes is a perinatal stroke. The man 59‑year‑old applied to the Federal center of brain and neurotechnologies had this one. The patient had bilateral tonic‑clonic seizures with loss of consciousness, and remission was observed during the last 4 years with antiepileptic drugs treatment. Complex radiological and func‑ tional diagnostics were performed with electroencephalography, magnetic resonance imaging, magnetic resonance tractography, functional magnetic resonance imaging. As a result of research many signs of Dyke–Davidoff–Masson syndrome were found. On the example of damage in the perinatal period and subsequent adaptation of the brain, its plasticity with respect to speech function was shown.Синдром Дайка–Давыдова–Массона является возможным последствием ряда патологий и редко встречается в клинической практике. Одна из его причин – перинатальный инсульт, по поводу последствий которого в ФГБУ «Федеральный центр мозга и нейротехнологий» обратился мужчина 59 лет. У пациента отмечались билатеральные тонико‑клонические приступы с потерей сознания, на фоне лечения антиэпилептическими препаратами в течение последних 4 лет наблюдалась ремиссия. Было проведено комплексное лучевое и функциональное исследование с применением электроэнцефалографии, магнитно‑резонансной томографии, магнитно‑резонансной трактографии, функциональной магнитно‑резонансной томографии. По данным обследования были обнаружены признаки, характерные для синдрома Дайка–Давыдова–Массона. На примере повреждения в перинатальном периоде и последующей адаптации мозга была показана его пластичность в отношении речевой функции