Similar Supine Heart Rate Variability Changes During 24-h Exposure to Normobaric vs. Hypobaric Hypoxia.

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Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_224331555824
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Similar Supine Heart Rate Variability Changes During 24-h Exposure to Normobaric vs. Hypobaric Hypoxia.
Journal
Frontiers in neuroscience
Author(s)
Tanner V., Faiss R., Saugy J., Bourdillon N., Schmitt L., Millet G.P.
ISSN
1662-4548 (Print)
ISSN-L
1662-453X
Publication state
Published
Issued date
2021
Peer-reviewed
Oui
Volume
15
Pages
777800
Language
english
Notes
Publication types: Journal Article
Publication Status: epublish
Abstract
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 (F <sub>I</sub> O <sub>2</sub> = 15.7 ± 2.0%; PB = 698 ± 25 mmHg) or HH (F <sub>I</sub> O <sub>2</sub> = 20.9%; PB = 534 ± 42 mmHg) in a randomized order. Pulse oximeter oxygen saturation (S <sub>p</sub> O <sub>2</sub> ), 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: S <sub>p</sub> O <sub>2</sub> 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 S <sub>p</sub> O <sub>2</sub> 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.
Keywords
altitude, arterial oxygen saturation, autonomic nervous system, heart rate variability, hypobaric hypoxia, normobaric hypoxia, normobaric normoxia
Pubmed
Web of science
Open Access
Yes
Create date
04/01/2022 9:32
Last modification date
22/07/2022 6:37
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