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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">ometendo</journal-id><journal-title-group><journal-title xml:lang="ru">Ожирение и метаболизм</journal-title><trans-title-group xml:lang="en"><trans-title>Obesity and metabolism</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2071-8713</issn><issn pub-type="epub">2306-5524</issn><publisher><publisher-name>Endocrinology Research Centre</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.14341/omet12607</article-id><article-id custom-type="elpub" pub-id-type="custom">ometendo-12607</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>Оригинальные исследования</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Original paper</subject></subj-group></article-categories><title-group><article-title>Влияние дефицита/недостаточности витамина D на циркадианный ритм кальция крови</article-title><trans-title-group xml:lang="en"><trans-title>Influence of deficiency or insufficiency of vitamin D on the circadian rhythm of serum calcium level</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9258-2591</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ковалева</surname><given-names>Елена Владимировна</given-names></name><name name-style="western" xml:lang="en"><surname>Kovaleva</surname><given-names>Elena V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ковалева Елена Владимировна, https://orcid.org/0000-0002-9258-2591, e-mail: elen.v.kovaleva@gmail.com</p><p>117036, Москва, ул. Дм. Ульянова, д. 11</p></bio><bio xml:lang="en"><p>Elena V. Kovaleva, MD, https://orcid.org/0000-0002-9258-2591, e-mail: elen.v.kovaleva@gmail.com</p></bio><email xlink:type="simple">elen.v.kovaleva@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Айнетдинова</surname><given-names>Алина Ринатовна</given-names></name><name name-style="western" xml:lang="en"><surname>Ajnetdinova</surname><given-names>Alina R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Айнетдинова Алина Ринатовна, ORCID: <ext-link xlink:href="https://orcid.org/0000-0001-6935-3187" ext-link-type="uri">https://orcid.org/0000-0001-6935-3187</ext-link>, eLibrary SPIN:9617-7460, e-mail: 9803005@mail.ru</p></bio><bio xml:lang="en"><p>Alina R. Ajnetdinova, MD, ORCID: <ext-link xlink:href="https://orcid.org/0000-0001-6935-3187" ext-link-type="uri">https://orcid.org/0000-0001-6935-3187</ext-link>, eLibrary SPIN:9617-7460, e-mail: 9803005@mail.ru</p><p>Moscow</p></bio><email xlink:type="simple">9803005@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Еремкина</surname><given-names>Анна Константиновна</given-names></name><name name-style="western" xml:lang="en"><surname>Eremkina</surname><given-names>Anna K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Еремкина Анна Константиновна, к.м.н., ORCID: https://orcid.org/0000-0001-6667-062X, eLibrary SPIN: 8848-2660, e-mail: a.lipatenkova@gmail.com</p></bio><bio xml:lang="en"><p>Anna K. Eremkina, MD, PhD, ORCID: <ext-link xlink:href="https://orcid.org/0000-0001-6667-062X" ext-link-type="uri">https://orcid.org/0000-0001-6667-062X</ext-link>, eLibrary SPIN: 8848-2660, e-mail: a.lipatenkova@gmail.com</p><p>Moscow</p></bio><email xlink:type="simple">a.lipatenkova@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мокрышева</surname><given-names>Наталья Георгиевна</given-names></name><name name-style="western" xml:lang="en"><surname>Mokrysheva</surname><given-names>Natalia G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мокрышева Наталья Георгиевна, д.м.н., ORCID: https://orcid.org/0000-0002-9717-9742, eLibrary SPIN: 5624-3875, e-mail: mokrisheva.natalia@endocrincentr.ru</p></bio><bio xml:lang="en"><p>Natalia G. Mokrysheva, MD, PhD, ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-9717-9742" ext-link-type="uri">https://orcid.org/0000-0002-9717-9742</ext-link>, eLibrary SPIN: 5624-3875, e-mail: mokrisheva.natalia@endocrincentr.ru</p><p>Moscow</p></bio><email xlink:type="simple">mokrisheva.natalia@endocrincentr.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный медицинский исследовательский центр эндокринологии</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Endocrinology Research Centre</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>04</day><month>12</month><year>2020</year></pub-date><volume>17</volume><issue>3</issue><fpage>283</fpage><lpage>291</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ковалева Е.В., Айнетдинова А.Р., Еремкина А.К., Мокрышева Н.Г., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Ковалева Е.В., Айнетдинова А.Р., Еремкина А.К., Мокрышева Н.Г.</copyright-holder><copyright-holder xml:lang="en">Kovaleva E.V., Ajnetdinova A.R., Eremkina A.K., Mokrysheva N.G.</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.omet-endojournals.ru/jour/article/view/12607">https://www.omet-endojournals.ru/jour/article/view/12607</self-uri><abstract><sec><title>Обоснование</title><p>Обоснование. Мягкая гипокальциемия является довольно частой лабораторной находкой, которая не сопровождается развитием яркой клинической симптоматики. К наиболее распространенным причинам гипокальциемии относятся недостаточное потребление кальцийсодержащих продуктов и дефицит витамина D. Учитывая широкую распространенность недостаточного уровня витамина D в общей популяции, актуальным представляется определение суточной вариабельности кальциемии до и после компенсации этого состояния.</p></sec><sec><title>Цель</title><p>Цель. Оценить суточный профиль кальциемии и кальциурии в зависимости от уровня 25(ОН) витамина D сыворотки крови.</p></sec><sec><title>Методы</title><p>Методы. Проведено интервенционное, проспективное, сравнительное исследование с участием 10 здоровых добровольцев. Продолжительность исследования составила 8 месяцев и включала в себя 2 последовательные госпитализации для проведения суточного профиля кальциемии и кальциурии. Анализ данных выполнен в августе 2020 г. Количественные признаки представлены медианой (Ме) и квартилями (Q1; Q3), а также средними и минимальными, максимальными значениями M (min; max); описательная статистика качественных признаков - абсолютными и относительными частотами.</p></sec><sec><title>Результаты</title><p>Результаты. При проведении сравнительного анализа Саобщ и Саскорр сыворотки крови и суточной кальциурии различий до и после достижения целевых уровней 25(OH)D выявлено не было. Тем не менее, было отмечено увеличение количества референсных показателей кальциемии по мере достижения оптимальных уровней 25(OH)D (&gt;30 нг/мл) - от 90,8% до 100% для Саобщ и от 94,2% до 97,5% для Саскорр. Для пациентов с низкими уровнями витамина D отмечены эпизоды гипокальциемии: в 3,33% случаев по Саобщ и в 5,8% по Саскорр.. По мере достижения компенсации частота выявляемых отклонений от нормальных значений нивелируется для Саобщ. (0) и уменьшается для Саскорр. (2,5% гипокальциемий). Анализ разброса показателей по Саобщ и Саскорр выявил снижение вариабельности профиля кальциемии в течение суток на фоне компенсации дефицита/недостаточности витамина D. В настоящем исследовании отмечена циркадианность суточного профиля кальциемии с наличием максимальных (09:40-17:40) и минимальных (23:40-07:40) значений в течение суток.</p></sec><sec><title>Заключение</title><p>Заключение. Установлено улучшение суточного профиля кальциемии на фоне компенсации имеющихся дефицита/ недостаточности витамина D с увеличением числа референсных показателей кальция, снижением вариабельности показателей в течение суток и уменьшением частоты гипокальциемий.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background: mild hypocalcemia is a common laboratory finding that is not accompanied by the clinical symptoms. The most common causes of hypocalcemia are inadequate calcium intake and vitamin D deficiency. Given the high prevalence of vitamin D deficiency (insufficiency), it seems relevant to determine the daily variability of serum calcium levels before and after its supplementation.</p></sec><sec><title>Aims</title><p>Aims: to assess the effect of 25(OH) vitamin D level on the daily profile of serum calcium and 24-hour urinary calcium levels. MATERIALS AND METHODS: the interventional, prospective, comparative study of 10 healthy volunteers (women/men - 9/1) was performed. We have analyzed the daily profiles of serum calcium and 24-hour urinary calcium levels. Summary duration of this study was 8 months and consisted two hospitalizations. Statistical analysis was done on August 2020. The descriptive statistics are represented by medians and the first and third quartiles in Me (Q1; Q3), average, maximum, and minimum values M (min; max) and by absolute and relative frequencies.</p></sec><sec><title>Results</title><p>Results: Me serum calcium levels (Catotaland Cacorr.) and 24-hour urinary calcium levels did not differ before and after vitamin D supplementation. However, the number of reference calcium values increased as 25 (OH) vitamin D level was reached more than 30 ng/ml from 90.8% to 100% for Catotal and from 94.2% to 97.5% for Cacorr. Episodes of hypocalcemia were registered in patients with low vitamin D levels: in 3.33% of cases according to Catotal and 5.8% for Cacorr. The frequency of hypocalcemia decreased for Catotal (to 0%) and for Cacorr. (to 2.5%) after treatment with cholecalciferol. Analysis of Catotal and Cacorr. deviations during the day showed a less variability of the calcium profile after treatment, This study also revealed circadian character of daily serum calcium profile with the presence of maximum (09:40-17:40) and minimum (23:40-07:40) values during the day.</p></sec><sec><title>Conclusions</title><p>Conclusions: Our study demonstrated the improvement of daily serum calcium profile after vitamin D supplementation. We confirmed the increased number of reference calcium values, decreased variability of serum calcium levels during the day and decreased frequency of hypocalcemia.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>гипокальциемия</kwd><kwd>витамин D</kwd><kwd>циркадианный ритм</kwd><kwd>суточный профиль кальция</kwd></kwd-group><kwd-group xml:lang="en"><kwd>hypocalcemia</kwd><kwd>vitamin D</kwd><kwd>circadian rhythm</kwd><kwd>daily serum calcium profile</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта № 19-315-90039. The reported study was funded by RFBR, project number 19-315-90039</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Peacock M. Calcium Metabolism in Health and Disease. 5. 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