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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">actabiomedica</journal-id><journal-title-group><journal-title xml:lang="ru">Acta Biomedica Scientifica</journal-title><trans-title-group xml:lang="en"><trans-title>Acta Biomedica Scientifica</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2541-9420</issn><issn pub-type="epub">2587-9596</issn><publisher><publisher-name>Scientific Centre for Family Health and Human Reproduction Problems</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29413/ABS.2023-8.3.8</article-id><article-id custom-type="elpub" pub-id-type="custom">actabiomedica-4210</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>КЛИНИЧЕСКАЯ ЛАБОРАТОРНАЯ ДИАГНОСТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CLINICAL LABORATORY DIAGNOSIS</subject></subj-group></article-categories><title-group><article-title>Биомаркеры повреждения миокарда и первый случай выявления макротропонина I у атлетов, тренирующихся на выносливость</article-title><trans-title-group xml:lang="en"><trans-title>Myocardial damage biomarkers and the first case of macrotroponin I detection in endurance athletes</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8184-9564</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Смирнов</surname><given-names>М. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Smirnov</surname><given-names>M. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Смирнов Михаил Сергеевич – аспирант сектора биохимии спорта </p><p>191040, г. Санкт-Петербург, Лиговский просп., 56Е, Россия</p></bio><bio xml:lang="en"><p> Mikhail S. Smirnov – Postgraduate at the Department of Sports Biochemistry</p><p>Ligovsky ave. 56E, Saint Petersburg 191040, Russian Federation </p></bio><email xlink:type="simple">smirnovmihail439@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7272-1654</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дорофейков</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Dorofeykov</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дорофейков Владимир Владимирович – доктор медицинских наук, профессор, заведующий кафедрой биохимии</p><p>190121, г. Санкт-Петербург, ул. Декабристов, 35, Россия </p></bio><bio xml:lang="en"><p>Vladimir V. Dorofeykov – Dr. Sc. (Med.), Professor, Head of the Department of Biochemistry</p><p>Dekabristov str. 35, Saint Petersburg 190121, Russian Federation </p></bio><email xlink:type="simple">vdorofeykov@ya.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2689-5503</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гольберг</surname><given-names>Н. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Golberg</surname><given-names>N. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гольберг Наталья Давидовна – кандидат биологических наук, доцент, заведующая сектором биохимии спорта </p><p>191040, г. Санкт-Петербург, Лиговский просп., 56Е, Россия</p></bio><bio xml:lang="en"><p>Natalia D. Golberg – Cand. Sc. (Biol.), Docent, Head of the Department of Sports Biochemistry</p><p>Ligovsky ave. 56E, Saint Petersburg 191040, Russian Federation </p></bio><email xlink:type="simple">ndgolberg@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7512-9621</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Курочкина</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kurochkina</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курочкина Евгения Вячеславовна – вице-президент</p><p>194292, г. Санкт-Петербург, Верхняя ул., 6А, помещ. 7-н-7, Россия </p></bio><bio xml:lang="en"><p>Evgenia V. Kurochkina – Vice President</p><p>Verkhnyaya str. 6A, office 7-n-7, Saint Petersburg 194292, Russian Federation </p></bio><email xlink:type="simple">jakonia88@bk.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУ «Санкт-Петербургский научно-исследовательский институт физической культуры»</institution></aff><aff xml:lang="en"><institution>Saint-Petersburg Scientific-Research Institute for Physical Culture</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГБОУ ВО «Национальный государственный Университет физической культуры, спорта и здоровья имени П.Ф. Лесгафта, Санкт-Петербург»</institution></aff><aff xml:lang="en"><institution>Lesgaft National State University of Physical Education, Sport and Health, St. Petersburg</institution></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>РОО «Санкт-Петербургская спортивная Федерация лыжных гонок»</institution></aff><aff xml:lang="en"><institution>St. Petersburg Cross-Country Skiing Federation</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>11</day><month>07</month><year>2023</year></pub-date><volume>8</volume><issue>3</issue><fpage>81</fpage><lpage>89</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Смирнов М.С., Дорофейков В.В., Гольберг Н.Д., Курочкина Е.В., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Смирнов М.С., Дорофейков В.В., Гольберг Н.Д., Курочкина Е.В.</copyright-holder><copyright-holder xml:lang="en">Smirnov M.S., Dorofeykov V.V., Golberg N.D., Kurochkina E.V.</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://www.actabiomedica.ru/jour/article/view/4210">https://www.actabiomedica.ru/jour/article/view/4210</self-uri><abstract><sec><title>Обоснование</title><p>Обоснование. Высокий уровень тропонина свидетельствует о повреждении миокарда, в том числе вызванного интенсивными тренировками. Исследования последних лет показали, что у больных увеличение концентрации тропонина может быть вызвано циркуляцией макроформ. В научной литературе нет данных, описывающих данную проблему у атлетов.</p></sec><sec><title>Цель исследования</title><p>Цель исследования. Выявить случаи и возможные причины высокого уровня кардиомаркеров в крови у атлетов до и после физической нагрузки на выносливость.</p><p>Материалы и методы исследования. Обследовано 11 лыжников-гонщиков мужского пола (15–21 лет). Эксперимент включал 2 этапа: первый – в ноябре 2020–2021 гг.; второй – в марте 2020–2021 гг. На каждом этапе проводили два забора крови из вены: первый – после дня отдыха, второй – через 12–14 ч после высокоинтенсивной тренировки. В сыворотке определяли активность общей креатинфосфокиназы (СК), концентрацию сердечной изоформы креатинфосфокиназы (СК-МВ) по массе и тропонина I (Тн), определённого высокочувствительным методом.</p></sec><sec><title>Результаты исследования</title><p>Результаты исследования. Активность CK превышала верхнюю границу нормы и снижалась от ноября к марту. Концентрация CK-MB в ответ на тренировку повышалась в 2 раза и не сопровождалась признаками повреждения миокарда. Наиболее чувствительным показателем, реагирующим на тренировку, оказался Тн. Однако самое высокое повышение тропонина в крови у одного атлета было связано с наличием макротропонина без наличия признаков миокардиального повреждения.</p></sec><sec><title>Заключение</title><p>Заключение. Повышение в крови уровня биомаркеров повреждения мышечной ткани, в том числе миокарда, в 2–4 раза является характерной реакцией для организма лыжника-гонщика в ответ на интенсивную тренировку. Высокий уровень тропонина в крови как до, так и после тренировки может быть связан с наличием макроформ протеина.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background. High levels of cardiac troponin in the blood indicates myocardial injury, including those caused by intense exercises. Recent studies have shown that an elevation in the troponin concentration in the patients can be caused by the macrotroponin circulation. There is no data in the scientific literature describing this problem in athletes.</p></sec><sec><title>The aim</title><p>The aim. To identify the cases and possible causes of high blood levels of cardiac markers in athletes before and after endurance exercises.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The study was conducted on 11 male cross-country skiers aged 15–21 years. The study included two stages: the first was conducted at the end of the preparatory period (November, 2020–2021), the second – in the middle (March) of the 2020–2021 competitive period. At each stage, two blood samples were taken from a vein: the first – in the morning on an empty stomach after a day of rest, the second – 12–14 hours after a high-intensity exercise. In the blood serum, the activity of total creatine kinase (CK), weight concentration of the cardiac isoenzyme of creatine kinase (CK-MB), and concentration of high sensitive troponin I (Tn) were measured.</p></sec><sec><title>Results</title><p>Results. The activity of CK in athletes exceeded the upper limit threshold, and decreased from the preparatory (November) to the competitive (March) period. The concentration of CK-MB in response to exercise increased by 2 times and was not accompanied by the signs of myocardial injury. The most sensitive indicator, responsive to physical activity, was troponin I. However, the highest elevation of Tn in blood of one athlete, both before and after the exercise, was associated with the presence of macrotroponin without signs of myocardial injury.</p></sec><sec><title>Conclusions</title><p>Conclusions. An increase of muscle tissue injury biomarkers in blood, including the heart muscle (CK, CK-MB, and Tn), by 2–4 times is a typical reaction for the body of a cross-country skier to an intense exercise. High levels of troponin in the blood, both before and after training or competition, may be associated with the presence of macrotroponin.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>лыжные гонки</kwd><kwd>тропонин I</kwd><kwd>макротропонин</kwd><kwd>креатинкиназа</kwd><kwd>повреждение миокарда</kwd></kwd-group><kwd-group xml:lang="en"><kwd>cross-country skiing</kwd><kwd>troponin I</kwd><kwd>macrotroponin</kwd><kwd>creatine kinase</kwd><kwd>myocardial injury</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Дорофейков В.В., Иванов В.И., Машек О.Н., Воробьева А.В. Количественное определение тропонина в диагностике повреждений миокарда. Клинико-лабораторный консилиум. 2008; (5): 26-32.</mixed-citation><mixed-citation xml:lang="en">Dorofeykov VV, Ivanov VI, Mashek ON, Vorobyeva AF. Quantitative measurement of troponin in diagnostics of myocardial injury. 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