Similar Supine Heart Rate Variability Changes During 24-h Exposure to Normobaric vs. Hypobaric Hypoxia
Purpose: This study aimed to investigate the differences between normobaric (NH) and hypobaric hypoxia (HH) on supine heart rate variability (HRV) during a 24-h exposure. We hypothesized a greater decrease in parasympathetic-related parameters in HH than in NH.Methods: A pooling of original data fro...
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Frontiers Media S.A.
2021-12-01
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Online Access: | https://www.frontiersin.org/articles/10.3389/fnins.2021.777800/full |
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author | Valérian Tanner Raphael Faiss Raphael Faiss Jonas Saugy Jonas Saugy Nicolas Bourdillon Laurent Schmitt Grégoire P. Millet |
author_facet | Valérian Tanner Raphael Faiss Raphael Faiss Jonas Saugy Jonas Saugy Nicolas Bourdillon Laurent Schmitt Grégoire P. Millet |
author_sort | Valérian Tanner |
collection | DOAJ |
description | Purpose: This study aimed to investigate the differences between normobaric (NH) and hypobaric hypoxia (HH) on supine heart rate variability (HRV) during a 24-h exposure. We hypothesized a greater decrease in parasympathetic-related parameters in HH than in NH.Methods: A pooling of original data from forty-one healthy lowland trained men was analyzed. They were exposed to altitude either in NH (FIO2 = 15.7 ± 2.0%; PB = 698 ± 25 mmHg) or HH (FIO2 = 20.9%; PB = 534 ± 42 mmHg) in a randomized order. Pulse oximeter oxygen saturation (SpO2), heart rate (HR), and supine HRV were measured during a 7-min rest period three times: before (in normobaric normoxia, NN), after 12 (H12), and 24 h (H24) of either NH or HH exposure. HRV parameters were analyzed for time- and frequency-domains.Results: SpO2 was lower in both hypoxic conditions than in NN and was higher in NH than HH at H24. Subjects showed similarly higher HR during both hypoxic conditions than in NN. No difference in HRV parameters was found between NH and HH at any time. The natural logarithm of root mean square of the successive differences (LnRMSSD) and the high frequency spectral power (HF), which reflect parasympathetic activity, decreased similarly in NH and HH when compared to NN.Conclusion: Despite SpO2 differences, changes in supine HRV parameters during 24-h exposure were similar between NH and HH conditions indicating a similar decrease in parasympathetic activity. Therefore, HRV can be analyzed similarly in NH and HH conditions. |
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publishDate | 2021-12-01 |
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spelling | doaj.art-0017200685094e99ac10bc59c11301e72022-12-21T23:11:14ZengFrontiers Media S.A.Frontiers in Neuroscience1662-453X2021-12-011510.3389/fnins.2021.777800777800Similar Supine Heart Rate Variability Changes During 24-h Exposure to Normobaric vs. Hypobaric HypoxiaValérian Tanner0Raphael Faiss1Raphael Faiss2Jonas Saugy3Jonas Saugy4Nicolas Bourdillon5Laurent Schmitt6Grégoire P. Millet7Medicine School, Faculty of Biology and Medicine, University of Lausanne, Lausanne, SwitzerlandInstitute of Sport Sciences, University of Lausanne, Lausanne, SwitzerlandREDs, Research and Expertise in Anti-Doping Sciences, University of Lausanne, Lausanne, SwitzerlandInstitute of Sport Sciences, University of Lausanne, Lausanne, SwitzerlandREDs, Research and Expertise in Anti-Doping Sciences, University of Lausanne, Lausanne, SwitzerlandInstitute of Sport Sciences, University of Lausanne, Lausanne, SwitzerlandNational Centre of Nordic-Ski, Research and Performance, Prémanon, FranceInstitute of Sport Sciences, University of Lausanne, Lausanne, SwitzerlandPurpose: This study aimed to investigate the differences between normobaric (NH) and hypobaric hypoxia (HH) on supine heart rate variability (HRV) during a 24-h exposure. We hypothesized a greater decrease in parasympathetic-related parameters in HH than in NH.Methods: A pooling of original data from forty-one healthy lowland trained men was analyzed. They were exposed to altitude either in NH (FIO2 = 15.7 ± 2.0%; PB = 698 ± 25 mmHg) or HH (FIO2 = 20.9%; PB = 534 ± 42 mmHg) in a randomized order. Pulse oximeter oxygen saturation (SpO2), heart rate (HR), and supine HRV were measured during a 7-min rest period three times: before (in normobaric normoxia, NN), after 12 (H12), and 24 h (H24) of either NH or HH exposure. HRV parameters were analyzed for time- and frequency-domains.Results: SpO2 was lower in both hypoxic conditions than in NN and was higher in NH than HH at H24. Subjects showed similarly higher HR during both hypoxic conditions than in NN. No difference in HRV parameters was found between NH and HH at any time. The natural logarithm of root mean square of the successive differences (LnRMSSD) and the high frequency spectral power (HF), which reflect parasympathetic activity, decreased similarly in NH and HH when compared to NN.Conclusion: Despite SpO2 differences, changes in supine HRV parameters during 24-h exposure were similar between NH and HH conditions indicating a similar decrease in parasympathetic activity. Therefore, HRV can be analyzed similarly in NH and HH conditions.https://www.frontiersin.org/articles/10.3389/fnins.2021.777800/fullheart rate variabilityarterial oxygen saturationnormobaric normoxiahypobaric hypoxianormobaric hypoxiaautonomic nervous system |
spellingShingle | Valérian Tanner Raphael Faiss Raphael Faiss Jonas Saugy Jonas Saugy Nicolas Bourdillon Laurent Schmitt Grégoire P. Millet Similar Supine Heart Rate Variability Changes During 24-h Exposure to Normobaric vs. Hypobaric Hypoxia Frontiers in Neuroscience heart rate variability arterial oxygen saturation normobaric normoxia hypobaric hypoxia normobaric hypoxia autonomic nervous system |
title | Similar Supine Heart Rate Variability Changes During 24-h Exposure to Normobaric vs. Hypobaric Hypoxia |
title_full | Similar Supine Heart Rate Variability Changes During 24-h Exposure to Normobaric vs. Hypobaric Hypoxia |
title_fullStr | Similar Supine Heart Rate Variability Changes During 24-h Exposure to Normobaric vs. Hypobaric Hypoxia |
title_full_unstemmed | Similar Supine Heart Rate Variability Changes During 24-h Exposure to Normobaric vs. Hypobaric Hypoxia |
title_short | Similar Supine Heart Rate Variability Changes During 24-h Exposure to Normobaric vs. Hypobaric Hypoxia |
title_sort | similar supine heart rate variability changes during 24 h exposure to normobaric vs hypobaric hypoxia |
topic | heart rate variability arterial oxygen saturation normobaric normoxia hypobaric hypoxia normobaric hypoxia autonomic nervous system |
url | https://www.frontiersin.org/articles/10.3389/fnins.2021.777800/full |
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