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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">Russian Journal of Physiology</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Physiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Российский физиологический журнал им. И.М. Сеченова</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-8139</issn><issn publication-format="electronic">2658-655X</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">679312</article-id><article-id pub-id-type="doi">10.31857/S0869813925020093</article-id><article-id pub-id-type="edn">UIHOGR</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>EXPERIMENTAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ЭКСПЕРИМЕНТАЛЬНЫЕ 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">A 15-Minute Abdominal Breathing Exercise Promotes Nap in Undergraduates: Instrumental Study Findings</article-title><trans-title-group xml:lang="ru"><trans-title>15-минутное упражнение в диафрагмальном дыхании, способствующее углублению дневного сна у студентов: результаты инструментальных исследований</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Khuurak</surname><given-names>A. E.</given-names></name><name xml:lang="ru"><surname>Хуурак</surname><given-names>А. Э.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shumov_de@pfur.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shumov</surname><given-names>D. E.</given-names></name><name xml:lang="ru"><surname>Шумов</surname><given-names>Д. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shumov_de@pfur.ru</email><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sveshnikov</surname><given-names>D. S.</given-names></name><name xml:lang="ru"><surname>Свешников</surname><given-names>Д. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shumov_de@pfur.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bakaeva</surname><given-names>Z. V.</given-names></name><name xml:lang="ru"><surname>Бакаева</surname><given-names>З. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shumov_de@pfur.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Yakunina</surname><given-names>E. B.</given-names></name><name xml:lang="ru"><surname>Якунина</surname><given-names>Е. Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shumov_de@pfur.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Torshin</surname><given-names>V. I.</given-names></name><name xml:lang="ru"><surname>Торшин</surname><given-names>В. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shumov_de@pfur.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dementienko</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Дементиенко</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shumov_de@pfur.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dorokhov</surname><given-names>V. B.</given-names></name><name xml:lang="ru"><surname>Дорохов</surname><given-names>В. Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shumov_de@pfur.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">RUDN University</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Higher Nervous Activity and Neurophysiology of the RAS</institution></aff><aff><institution xml:lang="ru">Институт высшей нервной деятельности и нейрофизиологии РАН</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Neurocom JSC</institution></aff><aff><institution xml:lang="ru">АО «Нейроком»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-02-16" publication-format="electronic"><day>16</day><month>02</month><year>2025</year></pub-date><volume>111</volume><issue>2</issue><issue-title xml:lang="ru"/><fpage>320</fpage><lpage>332</lpage><history><date date-type="received" iso-8601-date="2025-05-09"><day>09</day><month>05</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</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/0869-8139/article/view/679312">https://journals.eco-vector.com/0869-8139/article/view/679312</self-uri><abstract xml:lang="en"><p><bold>The study purpose</bold> – to validate by polysomnography (PSG) tools the efficacy of deep abdominal breathing (AB) as a technique improving daytime nap in healthy subjects. Materials and methods: 43 healthy subjects participated in the study, of whom 22 were included into intervention group and 21 into control group. In the intervention group, nap PSGs were recorded for 30 min after performing AB for 15 minutes. In the control group, a similar PSGs were recorded after 15 min of wakefulness. To assess the nap quality, standard sleep characteristics (latency, etc.) were determined from the subjects' hypnograms. In the intervention group total sleep time was significantly longer and activation index was significantly lower than in control group, while sleep latency did not differ significantly. In addition, the electroencephalogram (EEG) spectrum power ratio in alpha (8–13 Hz) and theta (4–8 Hz) frequency bands was analyzed. Linear regression model of alpha/theta power ratio time series was constructed within the framework of statistical analysis. It was concluded based on comparison of coefficients of this model along with the time domain sleep characteristics, that AB exercise preceding daytime nap activates physiological mechanisms accelerating fall-asleep process and making sleep more stable. This finding may be useful in the development of non-invasive approaches to insomnia treatment.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Цель исследования</bold> – подтвердить с помощью полисомнографии (ПСГ) эффективность метода глубокого диафрагмального дыхания как средства улучшения дневного сна здоровых испытуемых. В исследовании участвовали 43 здоровых испытуемых, из которых 22 человека вошли в экспериментальную группу и 21 – в контрольную. В экспериментальной группе в течение 30 мин записывали ПСГ дневного сна после выполнения ДД в течение 15 мин. В контрольной группе аналогичную ПСГ записывали после 15 мин бодрствования. Для оценки качества сна на основе гипнограмм испытуемых были определены стандартные его характеристики (латентность и т.п.). В экспериментальной группе достоверно больше было общее время сна и достоверно ниже – индекс активации; латентность сна различалась между группами недостоверно. Кроме того, анализировали соотношение спектральной мощности электроэнцефалограммы (ЭЭГ) в частотных диапазонах альфа- (8–13 Гц) и тета- (4–8 Гц). В рамках статистического анализа была построена линейная регрессионная модель зависимости отношения мощности альфа/тета от времени. На основании сравнения коэффициентов данной модели, наряду со сравнением временны́х параметров сна, сделан вывод, что выполнение диафрагмального дыхания перед коротким дневным сном включает физиологические механизмы, ускоряющие засыпание, и делает сон более устойчивым. Этот вывод может быть полезен при разработке неинвазивных подходов к лечению инсомнии.</p></trans-abstract><kwd-group xml:lang="en"><kwd>nap</kwd><kwd>breathing</kwd><kwd>insomnia</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>дневной сон</kwd><kwd>дыхание</kwd><kwd>инсомния</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Edinger JD, Arnedt JT, Bertisch SM, Carney CE, Harrington JJ, Lichstein KL, Sateia MJ, Troxel WM, Zhou ES, Kazmi U, Heald JL, Martin JL (2021) Behavioral and psychological treatments for chronic insomnia disorder in adults: An American Academy of Sleep Medicine clinical practice guideline. J Clin Sleep Med 17: 255–262. https://doi.org/10.5664/jcsm.8986</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Дорохов ВБ, Пучкова АН (2022) Нейротехнологии нефармакологической терапии нарушений сна. Журн высш нервн деятельн им ИП Павлова 72: 55–76. 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