Electromyographic rates to quantify inter-muscular interactions in athletes

В статье рассмотрены вопросы нейромышечной деятельности спортсменов-гребцов. Исследованы 48 спортсменов, занимающихся греблей академической. Регистрировались биоэлектрические потенциалы с моторных точек двуглавой и трехглавой мышц плеча у спортсмена-гребца с помощью поверхностной электромиографии при выполнении стандартизированной программы движений с дозированной нагрузкой на гребном тренажере Concept-II во время учебно-тренировочных сборов. Проанализированы электромиографические паттерны исследуемых мышц плеча при выполнении специфической работы на гребном тренажере. Выявлены закономерности и обоснован способ количественной электромиографической оценки согласованности сокращения и расслабления двуглавой и трехглавой мышц плеча. Разработанный метод позволяет объективизировать и количественно оценить согласованность работы двуглавой и трехглавой мышц плеча, что значительно повышает эффективность динамического контроля и коррекции учебно-тренировочных нагрузок, а также может быть использовано для решения экспертных вопросов и вопросов отбора на этапах спортивной карьеры. The article explores some matters of neuromuscular activity of rowers. Subject to the study were 48 athletes engaged in rowing. The study was designed to read bioelectric potentials in motor points of the musculus biceps brachii and musculus triceps brachii of the subject athletes, with the skin electromyography tests being applied to obtain the data profiles of the athletes performing the standard motor sequences with rated workloads on the Concept-II rowing simulator unit during the education-and-training sessions. Subject to the analyses were the electromyographic patterns of the above shoulder muscles under specific workloads on the rowing simulator. The study data gave the means to identify some regularities and offer a quantitative electromyographic rating method to profile the activation/ relaxation cycles of the musculus biceps brachii and musculus triceps brachii. The newly developed method makes it possible to obtain objective process rating data and assess the degree of harmonization of the musculus biceps brachii and musculus triceps brachii action/ relaxation cycles, the data being beneficial for efficiency improvement of the dynamic process control and the education/ training workload management and correction process; moreover, the process rating data may be beneficial for a variety of expert studies and sport selections in different stages of the athletic careers

Biorhythmologic aspects of seizure activity

Seasonal and circadian rhythms of neuronal and organism resistance to convulsive effect of strychnine and penicillin were studied in vivo on mice and rats and in vivo on cultured mouse cerebellar sections. Resistance was assessed by the latency of seizures in mice and neuronal response to convulsants in sections. In the night and morning time (0:00-9:00) seizure resistance in mice increased: it manifested in longer latency and lower mortality compared to those in the day and evening time (12:00-21:00). Seizure resistance was minimum in autumn and maximum in winter. Neurons in cerebellar section were most resistant to the convulsive effect of penicillin in autumn and winter and least resistant in spring and summer. Circadian rhythms of cerebellar neuron resistance to convulsants were opposite, which attests to reciprocal relations between epileptogenic and antiepileptic (cerebellar) cerebral structures

Biorhythmologic aspects of seizure activity

Seasonal and circadian rhythms of neuronal and organism resistance to convulsive effect of strychnine and penicillin were studied in vivo on mice and rats and in vivo on cultured mouse cerebellar sections. Resistance was assessed by the latency of seizures in mice and neuronal response to convulsants in sections. In the night and morning time (0:00-9:00) seizure resistance in mice increased: it manifested in longer latency and lower mortality compared to those in the day and evening time (12:00-21:00). Seizure resistance was minimum in autumn and maximum in winter. Neurons in cerebellar section were most resistant to the convulsive effect of penicillin in autumn and winter and least resistant in spring and summer. Circadian rhythms of cerebellar neuron resistance to convulsants were opposite, which attests to reciprocal relations between epileptogenic and antiepileptic (cerebellar) cerebral structures