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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="review-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">664106</article-id><article-id pub-id-type="doi">10.31857/S0131164624060101</article-id><article-id pub-id-type="edn">AFHEWH</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ОБЗОРЫ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Review Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">The Modern Concepts of Energy Balance and Energy Availability in Sports</article-title><trans-title-group xml:lang="ru"><trans-title>Современные представления об энергетическом балансе и доступности энергии в спорте</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bushmanova</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Бушманова</surname><given-names>Е. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio><p>Department of Ecological and Medical Physiology</p></bio><email>katerinabushmanova@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lyudinina</surname><given-names>A. Y.</given-names></name><name xml:lang="ru"><surname>Людинина</surname><given-names>А. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio><p>Department of Ecological and Medical Physiology</p></bio><email>salu_06@inbox.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Physiology, Ural Branch, RAS, Komi Republic</institution></aff><aff><institution xml:lang="ru">Институт физиологии ФИЦ Коми НЦ УрО РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-12" publication-format="electronic"><day>12</day><month>12</month><year>2024</year></pub-date><volume>50</volume><issue>6</issue><fpage>92</fpage><lpage>106</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/664106">https://journals.eco-vector.com/0131-1646/article/view/664106</self-uri><abstract xml:lang="en"><p>The imbalance between energy intake and total energy expenditure is the cause of a negative energy balance, and in combination with prolonged intense exercise, it can lead to the development of low energy availability (LEA). The concept of LEA is associated with a number of endocrine, cardiovascular, inflammatory, gastrointestinal, and mental characteristics, which have been combined under the term Relative Energy Deficiency in Sport (RED-S). The analysis of the world literature has shown a high prevalence of LEA and RED-S against the background of insufficient awareness of coaches and athletes about energy deficiency and its negative health consequences, which actualizes the importance of this problem. That is why the issues of early diagnosis, adequate treatment, and prevention of RED-S, taking into account the specifics of the sport, gender, and age, are of great practical importance.</p></abstract><trans-abstract xml:lang="ru"><p>Дисбаланс между энергопотреблением и суточным расходом энергии является причиной отрицательного энергетического баланса, а в сочетании с длительными интенсивными физическими нагрузками может привести к развитию низкой доступности энергии (НДЭ). Понятие НДЭ ассоциируется с целым рядом эндокринных, сердечно-сосудистых, воспалительных, желудочно-кишечных и психических изменений, которые были объединены под термином “относительный дефицит энергии в спорте” (<italic>Relative Energy Deficiency in Sport</italic>, <italic>RED-S</italic>). Проведенный анализ мировой литературы показал высокую распространенность НДЭ и <italic>RED-S</italic> на фоне недостаточной осведомленности тренеров и спортсменов о дефиците энергии и его негативных последствиях для здоровья, что актуализирует значимость данной проблемы. Именно поэтому вопросы ранней диагностики, адекватного лечения и профилактики <italic>RED-S</italic> с учетом специфики вида спорта, пола и возраста имеют большое практическое значение.</p></trans-abstract><kwd-group xml:lang="en"><kwd>energy balance</kwd><kwd>energy availability</kwd><kwd>relative energy deficit in sports</kwd><kwd>nutrition</kwd><kwd>athletes</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>энергетический баланс</kwd><kwd>доступность энергии</kwd><kwd>относительный дефицит энергии в спорте</kwd><kwd>рациональное питание</kwd><kwd>спортсмены</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство РФ</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of the Russian Federation</institution></institution-wrap></funding-source><award-id>ГР1021051201877-3-3.1.8</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Mountjoy M., Sundgot-Borgen J., Burke L.M. et al. 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