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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">Kazan medical journal</journal-id><journal-title-group><journal-title xml:lang="en">Kazan medical journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Казанский медицинский журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0368-4814</issn><issn publication-format="electronic">2587-9359</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">64592</article-id><article-id pub-id-type="doi">10.17816/kazmj64592</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">Functional state and stress periods of cardiovascular and sympathetic-adrenal systems in students throughout the academic year</article-title><trans-title-group xml:lang="ru"><trans-title>Функциональное состояние и периоды напряжения сердечно-сосудистой и симпатико-адреналовой систем у студенток в течение учебного года</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sitdikov</surname><given-names>F. G.</given-names></name><name xml:lang="ru"><surname>Ситдиков</surname><given-names>Ф. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>info@eco-vector.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shaikhelislamova</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Шайхелисламова</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>info@eco-vector.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kazan Order of the Red Banner of Labor of the Pedagogical Institute</institution></aff><aff><institution xml:lang="ru">Казанский орден Трудового Красного Знамени педагогического института</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="1993-02-15" publication-format="electronic"><day>15</day><month>02</month><year>1993</year></pub-date><volume>74</volume><issue>1</issue><issue-title xml:lang="ru"/><fpage>14</fpage><lpage>18</lpage><history><date date-type="received" iso-8601-date="2021-04-03"><day>03</day><month>04</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2021-04-03"><day>03</day><month>04</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 1993, Sitdikov F.G., Shaikhelislamova M.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 1993, Ситдиков Ф.Г., Шайхелисламова М.В.</copyright-statement><copyright-year>1993</copyright-year><copyright-holder xml:lang="en">Sitdikov F.G., Shaikhelislamova M.V.</copyright-holder><copyright-holder xml:lang="ru">Ситдиков Ф.Г., Шайхелисламова М.В.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="1996-02-15"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by-nc-sa/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://kazanmedjournal.ru/kazanmedj/article/view/64592">https://kazanmedjournal.ru/kazanmedj/article/view/64592</self-uri><abstract xml:lang="en"><p>The dynamics of a functional state of cardiovascular and sympathetic — adrenal systems in students aged 17—19 years throughout the academic year in the first, second and third УДК 616.921.5-06-037 course of the Pedagogical Institute is studied. The adaptation process of students is shown to be accompanied by stress periods in the functional state of cardiovascular and sympathetic — adrenal systems. The response of the systems under study to the dosed physical load varies according to their functioning intensity. The character of correlative relations between hormonal and mediative links of sympathetic — adrenal system and statistical characteristics of the cardiac rhythm depends ’on the training period and may serve as a criterion of the functional stress of the student’s organism.</p></abstract><trans-abstract xml:lang="ru"><p>Интенсивность и многообразие изменений, происходящих в организме студентов, особенно на младших курсах, требуют более глубокого и целенаправленного изучения физиологических систем, обеспечивающих приспособительные реакции организма, характера и динамики взаимосвязей этих систем, поиска научно обоснованных путей оптимизации их показателей.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Kazan Medical archive</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Казанский медицинский архив</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Баевский Р. М. 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