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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="research-article" 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">664065</article-id><article-id pub-id-type="doi">10.31857/S0131164624050041</article-id><article-id pub-id-type="edn">AOOONP</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>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Assessment of Human External Respiration Parameters in Simulated Lunar Gravity and Microgravity</article-title><trans-title-group xml:lang="ru"><trans-title>Оценка параметров внешнего дыхания человека в условиях моделированной лунной гравитации и микрогравитации</trans-title></trans-title-group></title-group><contrib-group><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><address><country country="RU">Russian Federation</country></address><email>alina.a.puchkova@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Katuntsev</surname><given-names>V. P.</given-names></name><name xml:lang="ru"><surname>Катунцев</surname><given-names>В. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alina.a.puchkova@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><address><country country="RU">Russian Federation</country></address><email>alina.a.puchkova@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Stavrovskaya</surname><given-names>D. M.</given-names></name><name xml:lang="ru"><surname>Ставровская</surname><given-names>Д. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alina.a.puchkova@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Primachenko</surname><given-names>G. K.</given-names></name><name xml:lang="ru"><surname>Примаченко</surname><given-names>Г. К.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alina.a.puchkova@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Baranov</surname><given-names>V. M.</given-names></name><name xml:lang="ru"><surname>Баранов</surname><given-names>В. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alina.a.puchkova@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">Институт медико-биологических проблем РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-11-20" publication-format="electronic"><day>20</day><month>11</month><year>2024</year></pub-date><volume>50</volume><issue>5</issue><fpage>29</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 ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0131-1646/article/view/664065">https://journals.eco-vector.com/0131-1646/article/view/664065</self-uri><abstract xml:lang="en"><p>The paper presents main results of experiments devoted to studying the influence of simulated microgravity and lunar gravity on the function of external respiration in humans. It has been shown that influence of human exposure to head-down bed rest (a model of the physiological effects of microgravity) and head-up bed rest (a model of the physiological effects of lunar gravity), similar to the influence of a horizontal position (bed rest), leads to a clinically insignificant decrease in the main respiratory parameters in the first hours of these analogue ground-based investigations. Subsequently, during hypokinesia, the marked changes are gradually levelled out. After cessation of experimental exposures, parameters of external respiration function are at the level of background values.</p></abstract><trans-abstract xml:lang="ru"><p>В данной статье представлены основные результаты серии экспериментов, посвященных изучению влияния моделированной микрогравитации и лунной гравитации на функцию внешнего дыхания человека. Показано, что пребывание человека в условиях антиортостатической (модель физиологических эффектов микрогравитации) и ортостатической гипокинезии (модель физиологических эффектов лунной гравитации), аналогично горизонтальному положению, приводит к клинически не значимому снижению основных респираторных показателей в первые часы воздействия. В дальнейшем, в ходе гипокинезии эти изменения постепенно нивелируются. После прекращения экспериментального воздействия показатели функции внешнего дыхания восстанавливаются до уровня фоновых значений.</p></trans-abstract><kwd-group xml:lang="en"><kwd>respiratory system</kwd><kwd>spirometry</kwd><kwd>head-up bed rest</kwd><kwd>lunar gravity</kwd><kwd>head-down bed rest</kwd><kwd>microgravity</kwd><kwd>space flight</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>дыхательная система</kwd><kwd>спирометрия</kwd><kwd>ортостатическая гипокинезия</kwd><kwd>лунная гравитация</kwd><kwd>антиортостатическая гипокинезия</kwd><kwd>микрогравитация</kwd><kwd>космический полет</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российская академия наук</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Academy of Sciences</institution></institution-wrap></funding-source><award-id>FMFR-2024-0038</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Krittanawong C., Singh N.K., Scheuring R.A. et al. 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