Human PhysiologyHuman PhysiologyФизиология человека0131-16463034-6150The Russian Academy of Sciences66397810.31857/S0131164624010045ArticlesСтатьиResearch ArticleSpecific changes in contractive functions and skeletal muscle architecture in humans in response to the use of two protocols of unmodulated neuro-muscular electrostimulationСпецифические изменения сократительных функций и архитектуры скелетной мышцы у человека в ответ на использование двух протоколов немодулированной нервно-мышечной электростимуляцииKoryakYu. A.КорякЮ. А.
Russian Federation
yurikoryak@mail.ruInstitute of Biomedical Problems of the RASФГБУН ГНЦ РФ – Институт медико-биологических проблем РАН04062024501456325022025Copyright ©; 2024, Russian Academy of SciencesCopyright ©; 2024, Российская академия наук2024Russian Academy of SciencesРоссийская академия наукhttps://journals.eco-vector.com/0131-1646/article/view/663978

The purpose of this study was to study the effect of unmodulated low-frequency superficial of neuromuscular electrical stimulation (NMES) of 30 and 60 min/day for 7 weeks on the force, velocity-strength properties of the triceps surae muscle (TS) and architecture (lengths and angles of fascicles) of human the medial gastrocnemius muscle (MG). Many studies have examined the effect of training intensity (percentage of maximal voluntary isometric contraction — MVC) during NMES on muscle force response. However, no study has examined the effect of the number of NMES sessions per day over 7 weeks on changes in the TS strength. Ten healthy volunteers (23.2 ± 3.2 years; age range 18–28 years) volunteered for the study and were randomly assigned to group 1 (30 min NMES) and group 2 (60 min NMES) 5 times a day. NMES for a 7-week period, a total of 35 NMES workouts Isometric triceps calf strength was recorded with a Biodex isokinetic dynamometer. The longitudinal ultrasonic images of the MG was measured in vivo using the B-mode Edge ultrasound system. After a 7-week training period, MVC and voluntary maximal “explosive” strength differed significantly between groups. Based on electrical stimulation parameters and healthy subjects in this study, electrical training caused an increase in foot extensor muscle strength and a gradient in voluntary explosive strength when used for 5 training per week for 30 min for 7 weeks.

Целью данной работы было определить влияние немодулированной относительно низкочастотной поверхностной нервно-мышечной электростимуляции (ЭСТ) длительностью 30 и 60 мин/день на протяжении 7 нед. на сократительные функции мышц. Во многих исследованиях изучали влияние интенсивности ЭСТ-тренировки на показатель максимальной произвольной изометрической силы (МПС) мышц. Однако ни в одном из исследований не изучалось влияние длительности ЭСТ-тренировки в неделю и в один день на изменение функций мышц. В настоящем исследовании приняли участие 10 здоровых мужчин-добровольцев (23.2 ± 3.2 года), которые случайным образом были распределены в две группы. Первая группа испытуемых применяла ЭСТ-тренировку 5 раз в неделю на протяжении 30 мин, а вторая группа — 5 раз в неделю, но на протяжении 60 мин. Влияние ЭСТ-тренировки оценивали по изменению МПС и скоростно-силовых свойств мышц-разгибателей стопы, регистрируемых до “электрической” тренировки, а затем в начале каждой недели 7-недельного тренировочного периода для всех испытуемых. Сократительные свойства регистрировали с использованием изокинетического динамометра Biodex. После 7-недельного тренировочного периода показатели МПС и максимальной произвольной “взрывной” силы значительно отличались между группами. Основываясь на параметрах ЭСТ и здоровых испытуемых, участвующих в данном исследовании, “электрическая” тренировка 5 раз в неделю и в течение 30 мин на протяжении 7 нед. вызвала увеличение силы мышц-разгибателей стопы и градиента максимальной произвольной “взрывной” силы.

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