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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">664097</article-id><article-id pub-id-type="doi">10.31857/S0131164623600428</article-id><article-id pub-id-type="edn">ENEGQU</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 Gravitational Unloading on the Dynamics of Blood Redistribution During Orthostasis: The Study by Near-Infrared Spectroscopy</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние гравитационной разгрузки на динамику перераспределения крови при ортостазе: исследование методом ИК-спектроскопии</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zhedyaev</surname><given-names>R. Yu.</given-names></name><name xml:lang="ru"><surname>Жедяев</surname><given-names>Р. Ю.</given-names></name></name-alternatives><email>ost.msu@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tarasova</surname><given-names>O. S.</given-names></name><name xml:lang="ru"><surname>Тарасова</surname><given-names>О. С.</given-names></name></name-alternatives><email>ost.msu@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Puchkova</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Пучкова</surname><given-names>А. А.</given-names></name></name-alternatives><email>ost.msu@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shpakov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Шпаков</surname><given-names>А. В.</given-names></name></name-alternatives><email>ost.msu@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vinogradova</surname><given-names>O. L.</given-names></name><name xml:lang="ru"><surname>Виноградова</surname><given-names>О. Л.</given-names></name></name-alternatives><email>ost.msu@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Borovik</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Боровик</surname><given-names>А. С.</given-names></name></name-alternatives><email>ost.msu@gmail.com</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><aff-alternatives id="aff2"><aff><institution xml:lang="en">Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени М.В. Ломоносова</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>67</fpage><lpage>75</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, Р.Ю. Жедяев, О.С. Тарасова, А.А. Пучкова, А.В. Шпаков, О.Л. Виноградова, А.С. Боровик</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Р.Ю. Жедяев, О.С. Тарасова, А.А. Пучкова, А.В. Шпаков, О.Л. Виноградова, А.С. Боровик</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Р.Ю. Жедяев, О.С. Тарасова, А.А. Пучкова, А.В. Шпаков, О.Л. Виноградова, А.С. Боровик</copyright-holder><copyright-holder xml:lang="ru">Р.Ю. Жедяев, О.С. Тарасова, А.А. Пучкова, А.В. Шпаков, О.Л. Виноградова, А.С. Боровик</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0131-1646/article/view/664097">https://journals.eco-vector.com/0131-1646/article/view/664097</self-uri><abstract xml:lang="en"><p id="idm45257551679696">The effects of long-term anti-orthostatic hypokinesia (bed rest – BR, a model of gravitational unloading) on the dynamics of orthostasis-induced changes in the content of total (THb), deoxygenated (HHb), and oxygenated (OHb) hemoglobin in the calf at the level of the gastrocnemius muscle medial head were studied using the near-infrared spectroscopy. In seven young men, 2−4 days before and on the 19th day of BR, a passive head-up tilt test was performed (15 min in the supine position, then 15 min at 65°). After BR, there was an increase in heart rate and a decrease in stroke volume in the supine position, as well as more pronounced changes in these parameters during orthostasis. Blood pressure in the supine position and orthostasis did not change after BR. THb content increased gradually during orthostasis and reached a plateau by the end of the test; after BR, an increase in the half-rise time and a two-fold increase in the plateau level were observed. Tissue HHb content by the end of the tilt test also increased after BR. The dynamics of OHb before BR was more complicated: this indicator grew, reached a maximum during a minute, and then gradually decreased to half of the maximum by the end of the test. After BR, the dynamics of OHb changed drastically: the signal increased gradually and reached a level that was twice the peak value of OHb content before BR. The results allow us to conclude that exposure to BR weakens the compensatory constriction of calf vessels during tilt test; consequently, it is followed by higher blood filling of calf vascular bed, which, in turn, leads to smaller SV during orthostasis.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45257551675440">В данной работе исследовали влияние длительной антиортостатической гипокинезии (АНОГ, модель гравитационной разгрузки) на динамику обусловленных ортостазом изменений содержания общего (THb), дезоксигенированного (HHb) и оксигенированного (OHb) гемоглобина в голени на уровне медиальной головки икроножной мышцы с использованием метода спектроскопии в ближнем инфракрасном диапазоне. У семи молодых мужчин за 2–4 сут до и на 19 сут АНОГ проводили пассивную ортопробу (15 мин в положении лежа, затем 15 мин при 65°). После АНОГ наблюдались увеличение частоты сердечных сокращений и снижение ударного объема в положении лежа, а также более выраженные изменения этих показателей при ортостазе. Уровни артериального давления в положении лежа и при ортостазе не изменились после АНОГ. Содержание ТHb во время ортостаза постепенно повышалось с выходом на плато в конце теста; после АНОГ наблюдалось увеличение времени полунарастания этого показателя и повышение уровня плато в два раза. Содержание HHb в ткани к концу ортопробы после АНОГ также увеличивалось. Динамика содержания OHb до АНОГ была более сложной: после перехода в вертикальное положение этот показатель рос, в течение первой минуты достигал максимума, а затем постепенно снижался до половины максимума к концу теста. После АНОГ динамика содержания OHb в ортостазе принципиально изменялась: сигнал постепенно рос и достигал уровня, который вдвое превышал пиковое значение этого показателя до АНОГ. Полученные результаты позволяют заключить, что пребывание в условиях АНОГ приводит к нарушению компенсаторного сужения сосудов голени при ортостазе, к повышению кровенаполнения сосудистого русла ног и, как следствие, к более выраженному снижению ударного объема.</p></trans-abstract><kwd-group xml:lang="en"><kwd>anti-orthostatic hypokinesia</kwd><kwd>blood filling of the vascular bed</kwd><kwd>myogenic response</kwd><kwd>orthostasis</kwd><kwd>near infrared spectroscopy.</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>антиортостатическая гипокинезия</kwd><kwd>кровенаполнение сосудистого русла</kwd><kwd>миогенная реакция</kwd><kwd>ортостаз</kwd><kwd>спектроскопия в ближнем инфракрасном диапазоне.</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Matzen S., Perkot G., Groths S. et al. Blood volume distribution during head-up tilt induced central hypovolaemia in man // Clin. Physiol. 1991. V. 11. № 5. 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