Reduced vagal modulations of heart rate during overwintering in Antarctica

Abstract Long-duration Antarctic expeditions are characterized by isolation, confinement, and extreme environments. Here we describe the time course of cardiac autonomic modulation assessed by heart rate variability (HRV) during 14-month expeditions at the German Neumayer III station in Antarctica....

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Autores principales:	Martina A. Maggioni, Giampiero Merati, Paolo Castiglioni, Stefan Mendt, Hanns-Christian Gunga, Alexander C. Stahn
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8d010c02b84c4b82a08f79bbb419b76a
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spelling	oai:doaj.org-article:8d010c02b84c4b82a08f79bbb419b76a2021-12-02T12:33:05ZReduced vagal modulations of heart rate during overwintering in Antarctica10.1038/s41598-020-78722-32045-2322https://doaj.org/article/8d010c02b84c4b82a08f79bbb419b76a2020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-78722-3https://doaj.org/toc/2045-2322Abstract Long-duration Antarctic expeditions are characterized by isolation, confinement, and extreme environments. Here we describe the time course of cardiac autonomic modulation assessed by heart rate variability (HRV) during 14-month expeditions at the German Neumayer III station in Antarctica. Heart rate recordings were acquired in supine position in the morning at rest once before the expedition (baseline) and monthly during the expedition from February to October. The total set comprised twenty-five healthy crewmembers (n = 15 men, 38 ± 6 yrs, n = 10 women, 32 ± 6 yrs, mean ± SD). High frequency (HF) power and the ratio of low to high frequency power (LF/HF) were used as indices of vagal modulation and sympathovagal balance. HF power adjusted for baseline differences decreased significantly during the expedition, indicating a gradual reduction in vagal tone. LF/HF powers ratio progressively shifted toward a sympathetic predominance reaching statistical significance in the final trimester (August to October) relative to the first trimester (February to April). This effect was particularly pronounced in women. The depression of cardio-vagal tone and the shift toward a sympathetic predominance observed throughout the overwintering suggest a long-term cardiac autonomic modulation in response to isolation and confinement during Antartic overwintering.Martina A. MaggioniGiampiero MeratiPaolo CastiglioniStefan MendtHanns-Christian GungaAlexander C. StahnNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Martina A. Maggioni Giampiero Merati Paolo Castiglioni Stefan Mendt Hanns-Christian Gunga Alexander C. Stahn Reduced vagal modulations of heart rate during overwintering in Antarctica
description	Abstract Long-duration Antarctic expeditions are characterized by isolation, confinement, and extreme environments. Here we describe the time course of cardiac autonomic modulation assessed by heart rate variability (HRV) during 14-month expeditions at the German Neumayer III station in Antarctica. Heart rate recordings were acquired in supine position in the morning at rest once before the expedition (baseline) and monthly during the expedition from February to October. The total set comprised twenty-five healthy crewmembers (n = 15 men, 38 ± 6 yrs, n = 10 women, 32 ± 6 yrs, mean ± SD). High frequency (HF) power and the ratio of low to high frequency power (LF/HF) were used as indices of vagal modulation and sympathovagal balance. HF power adjusted for baseline differences decreased significantly during the expedition, indicating a gradual reduction in vagal tone. LF/HF powers ratio progressively shifted toward a sympathetic predominance reaching statistical significance in the final trimester (August to October) relative to the first trimester (February to April). This effect was particularly pronounced in women. The depression of cardio-vagal tone and the shift toward a sympathetic predominance observed throughout the overwintering suggest a long-term cardiac autonomic modulation in response to isolation and confinement during Antartic overwintering.
format	article
author	Martina A. Maggioni Giampiero Merati Paolo Castiglioni Stefan Mendt Hanns-Christian Gunga Alexander C. Stahn
author_facet	Martina A. Maggioni Giampiero Merati Paolo Castiglioni Stefan Mendt Hanns-Christian Gunga Alexander C. Stahn
author_sort	Martina A. Maggioni
title	Reduced vagal modulations of heart rate during overwintering in Antarctica
title_short	Reduced vagal modulations of heart rate during overwintering in Antarctica
title_full	Reduced vagal modulations of heart rate during overwintering in Antarctica
title_fullStr	Reduced vagal modulations of heart rate during overwintering in Antarctica
title_full_unstemmed	Reduced vagal modulations of heart rate during overwintering in Antarctica
title_sort	reduced vagal modulations of heart rate during overwintering in antarctica
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/8d010c02b84c4b82a08f79bbb419b76a
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Reduced vagal modulations of heart rate during overwintering in Antarctica

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