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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">sibmed</journal-id><journal-title-group><journal-title xml:lang="ru">Сибирский научный медицинский журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Сибирский научный медицинский журнал</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2410-2512</issn><issn pub-type="epub">2410-2520</issn><publisher><publisher-name>ИЦиГ СО РАН</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18699/SSMJ20250312</article-id><article-id custom-type="elpub" pub-id-type="custom">sibmed-2244</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МЕДИКО-БИОЛОГИЧЕСКИЕ НАУКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>BIOMEDICINE</subject></subj-group></article-categories><title-group><article-title>Биоэлектрический импеданс и морфометрия левого желудочка сердца крыс после физических нагрузок разной длительности</article-title><trans-title-group xml:lang="en"><trans-title>Bioelectrical impedance of the left ventricle of the rat heart during physical exercise of different durations</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7555-9306</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Коломеец</surname><given-names>Н. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Kolomeyets</surname><given-names>N. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Наталия Леонидовна Коломеец, к. ф.-м. н.</p><p>167982; ул. Коммунистическая, 24; Сыктывкар</p></bio><bio xml:lang="en"><p>Natalia L. Kolomeyets, candidate of physico-mathematical sciences</p><p>167982; Kommunisticheskaya st., 24; Syktyvkar</p></bio><email xlink:type="simple">kolomeec@frc.komisc.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6140-1252</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ивонин</surname><given-names>А. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Ivonin</surname><given-names>A. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алексей Геннадьевич Ивонин, к. б. н.</p><p>167982; ул. Коммунистическая, 24; Сыктывкар</p></bio><bio xml:lang="en"><p>Alexey G. Ivonin, candidate of biological sciences</p><p>167982; Kommunisticheskaya st., 24; Syktyvkar</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3517-4169</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гуляева</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Gulyaeva</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Анна Сергеевна Гуляева, к. б. н.</p><p>167982; ул. Коммунистическая, 24; Сыктывкар</p></bio><bio xml:lang="en"><p>Anna S. Gulyaeva, candidate of biological sciences</p><p>167982; Kommunisticheskaya st., 24; Syktyvkar</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6108-1444</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рощевская</surname><given-names>И. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Roshchevskaya</surname><given-names>I. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ирина Михайловна Рощевская, д. б. н., чл.-корр. РАН</p><p>167982; ул. Коммунистическая, 24; Сыктывкар</p></bio><bio xml:lang="en"><p>Irina M. Roshchevskaya, doctor of biological sciences, corresponding member of RAS</p><p>167982; Kommunisticheskaya st., 24; Syktyvkar</p></bio><email xlink:type="simple">compcard@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Коми научный центр УрО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Komi Science Centre of UrB RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>13</day><month>07</month><year>2025</year></pub-date><volume>45</volume><issue>3</issue><fpage>112</fpage><lpage>119</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Коломеец Н.Л., Ивонин А.Г., Гуляева А.С., Рощевская И.М., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Коломеец Н.Л., Ивонин А.Г., Гуляева А.С., Рощевская И.М.</copyright-holder><copyright-holder xml:lang="en">Kolomeyets N.L., Ivonin A.G., Gulyaeva A.S., Roshchevskaya I.M.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://sibmed.elpub.ru/jour/article/view/2244">https://sibmed.elpub.ru/jour/article/view/2244</self-uri><abstract><p>   Регулярные физические упражнения вызывают морфофункциональные изменения сердца в зависимости от нагрузки.</p><p>   Целью исследования было выявить изменения показателей биоимпедансной спектроскопии левого желудочка сердца у крыс после физических нагрузок (плавания) разной длительности.</p><sec><title>   Материал и методы</title><p>   Материал и методы. Выполнена морфологическая и биоимпедансная оценка левого желудочка сердца у самцов крыс, прошедших 12-недельный курс плавания, и у интактных животных. Плаванию (5 раз в неделю) подвергали две группы крыс: опытную (по 200 минут в день) и контрольную (по 5 минут в день).</p><p>   Результаты и их обсуждение. Гистологическими исследованиями показано увеличение диаметра кардиомиоцитов в левом желудочке сердца у животных опытной и контрольной групп в сравнении с интактными крысами. У животных, подвергавшихся длительной физической нагрузке, выявлено значимое увеличение реактивного сопротивления биоэлектрического импеданса левого желудочка сердца при частоте электрического тока 50 кГц по сравнению с плававшими по пять минут в день, указывающее на большие изменения объема мышечной ткани. Отмечено увеличение активного сопротивления биоэлектрического импеданса левого желудочка сердца наряду с меньшим объемом соединительной ткани у крыс опытной группы в сравнении с контрольными. Амплитуда биоэлектрического импеданса миокарда левого желудочка сердца у крыс опытной группы была больше, чем у животных контрольной (при 30 и 50 кГц) и интактной (при 100 кГц) групп, что указывает на различия в объеме межклеточного и внутриклеточного пространства.</p></sec><sec><title>   Заключение</title><p>   Заключение. У крыс под воздействием длительных физических нагрузок плаванием в течение 12 недель выявлены морфометрические и биоимпедансные изменения левого желудочка сердца, связанные с физиологическим ремоделированием миокарда.</p></sec></abstract><trans-abstract xml:lang="en"><p>   Regular physical exercise causes morphofunctional changes in the heart depending on the load.</p><p>   The aim of our study was to identify changes in the bioimpedance spectroscopy parameters of the left ventricle of the heart in rats after physical exercise (swimming) of different duration.</p><sec><title>   Material and methods</title><p>   Material and methods. Morphological and bioimpedance assessment of the left ventricle of the heart was performed in male rats that underwent a 12-week swimming course and in intact animals. Two groups of rats were subjected to swimming (5 times a week): the experimental (200 minutes a day) and the control (5 minutes a day).</p><p>   Results and discussion. Histological studies have shown an increase in the diameter of cardiomyocytes in the left ventricle of the heart in animals of the experimental and control groups compared to intact rats. In animals subjected to prolonged physical exercise, a significant increase in the reactance of the bioelectrical impedance of the left ventricle of the heart at an electric current frequency of 50 kHz was revealed compared to those swimming for five minutes a day, indicating greater changes in muscle tissue volume. An increase in the active resistance of the bioelectrical impedance of the left ventricle of the heart was noted along with a smaller volume of connective tissue in the rats of the experimental group compared to the control. The amplitude of the bioelectrical impedance of the myocardium of the left ventricle of the heart in rats of the experimental group was greater than in animals of the control (at 30 and 50 kHz) and intact (at 100 kHz) groups, which indicates differences in the volume of intercellular and intracellular space.</p></sec><sec><title>   Conclusions</title><p>   Conclusions. In rats under the influence of prolonged physical exercise by swimming for 12 weeks, morphometric and bioimpedance changes in the left ventricle of the heart associated with physiological remodeling of the myocardium were revealed.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>биоимпеданс миокарда</kwd><kwd>плавание</kwd><kwd>принудительные тренировки</kwd><kwd>ремоделирование левого желудочка сердца</kwd></kwd-group><kwd-group xml:lang="en"><kwd>myocard bioimpedance</kwd><kwd>swimming</kwd><kwd>forced training</kwd><kwd>left ventricular remodeling</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках Государственного задания по плану НИР № 125012300706-7</funding-statement><funding-statement xml:lang="en">The work was carried out within the framework of the State assignment according to the research plan No. 125012300706-7</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Bei Y., Wang L., Ding R., Che L., Fan Z., Gao W., Liang Q., Lin S., Liu S., Lu X., … Xiao J. 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