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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Human Physiology</journal-id><journal-title-group><journal-title xml:lang="en">Human Physiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Физиология человека</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0131-1646</issn><issn publication-format="electronic">3034-6150</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">664077</article-id><article-id pub-id-type="doi">10.31857/S013116462260104X</article-id><article-id pub-id-type="edn">YZRIHQ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Influence of Factors of 21-Day Head-Down Bed Rest on the Level of Myocardial Extensibility Biomarker ST2 in the Blood</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние факторов 21-суточной антиортостатической гипокинезии на уровень биомаркера “растяжения” миокарда st2 в крови</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pastushkova</surname><given-names>L. Kh.</given-names></name><name xml:lang="ru"><surname>Пастушкова</surname><given-names>Л. Х.</given-names></name></name-alternatives><email>daryakudryavtseva@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Goncharova</surname><given-names>A. G.</given-names></name><name xml:lang="ru"><surname>Гончарова</surname><given-names>А. Г.</given-names></name></name-alternatives><email>daryakudryavtseva@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kashirina</surname><given-names>D. N.</given-names></name><name xml:lang="ru"><surname>Каширина</surname><given-names>Д. Н.</given-names></name></name-alternatives><email>daryakudryavtseva@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Goncharov</surname><given-names>I. N.</given-names></name><name xml:lang="ru"><surname>Гончаров</surname><given-names>И. Н.</given-names></name></name-alternatives><email>daryakudryavtseva@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Larina</surname><given-names>I. M.</given-names></name><name xml:lang="ru"><surname>Ларина</surname><given-names>И. М.</given-names></name></name-alternatives><email>daryakudryavtseva@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Biomedical Problems of the RAS</institution></aff><aff><institution xml:lang="ru">ФГБУН ГНЦ РФ – Институт медико-биологических проблем РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-11-01" publication-format="electronic"><day>01</day><month>11</month><year>2023</year></pub-date><volume>49</volume><issue>6</issue><fpage>36</fpage><lpage>40</lpage><history><date date-type="received" iso-8601-date="2025-02-25"><day>25</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Л.Х. Пастушкова, А.Г. Гончарова, Д.Н. Каширина, И.Н. Гончаров, И.М. Ларина</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Л.Х. Пастушкова, А.Г. Гончарова, Д.Н. Каширина, И.Н. Гончаров, И.М. Ларина</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Л.Х. Пастушкова, А.Г. Гончарова, Д.Н. Каширина, И.Н. Гончаров, И.М. Ларина</copyright-holder><copyright-holder xml:lang="ru">Л.Х. Пастушкова, А.Г. Гончарова, Д.Н. Каширина, И.Н. Гончаров, И.М. Ларина</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0131-1646/article/view/664077">https://journals.eco-vector.com/0131-1646/article/view/664077</self-uri><abstract xml:lang="en"><p id="idm45257554521136">Head-down bed rest (HDBR) is one of the best known models of the effects of weightlessness. The responses of the cardiovascular system to thoracocranial blood redistribution continue to be studied in relation to changes in the volumes of the heart chambers and the structure of the heart muscle. The assessment of myocardial stretch, individual response of the heart muscle to HDBR and stratification of the risk of developing heart failure according to the dynamics of a cardiomarker, independent of the influence of such factors as gender, age, body weight, glomerular filtration rate, anemia and hypovolemia, is relevant. The aim of the work was to investigate the influence of factors of 21-day HDBR on the level of the ST2 myocardial stretch biomarker. The effect of 21-day HDBR on the level of ST2 cardiomyocyte stretch marker was studied for the first time. The level of ST2 significantly decreased by the end of HDBR. The data obtained are of practical importance in relation to the problems of medical selection of cosmonauts and test volunteers. Background levels, variability of indicators during HDBR and the recovery period indicate the absence of risks for the development of heart failure and cardiofibrosis in this sample of subjects in this study.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45257554519520">Антиортостатическая гипокинезия (АНОГ) является одной из наиболее известных моделей эффектов невесомости. Продолжают изучать ответы сердечно-сосудистой системы на торако-краниальное перераспределение крови, применительно к изменению объемов камер сердца и структуры сердечной мышцы. Актуальна оценка “растяжения” миокарда, индивидуальной реакции сердечной мышцы на АНОГ и стратификации риска развития сердечной недостаточности по динамике кардиомаркера, независимого от влияния таких факторов как пол, возраст, масса тела, скорость клубочковой фильтрации, анемия и гиповолемия. Целью работы было исследовать влияние факторов 21-суточной АНОГ на уровень биомаркера “растяжения” миокарда ST2. Впервые изучено влияние 21-суточной АНОГ на уровень маркера “растяжения” кардиомиоцитов ST2. Уровень ST2 достоверно снижался к концу АНОГ. Полученные данные имеют практическое значение применительно к проблемам медицинского отбора космонавтов и испытателей-добровольцев. Фоновые уровни, вариабельность показателей в течение АНОГ и периода восстановления свидетельствуют об отсутствии рисков развития сердечной недостаточности и кардиофиброза у данной выборки обследуемых в этом исследовании.</p></trans-abstract><kwd-group xml:lang="en"><kwd>21-day HDBR</kwd><kwd>ST2 cardiomarker</kwd><kwd>cardiomyocyte stretch</kwd><kwd>risk of heart failure.</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>21-суточная АНОГ</kwd><kwd>кардиомаркер ST2</kwd><kwd>“растяжение” кардиомиоцита</kwd><kwd>риск сердечной недостаточности.</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Lobachik V.I., Abrosimov S.V., Zhidkov V.V., Endeka D.K. 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