Alterations in autonomic cardiac modulation in response to normobaric hypoxia

Journal article


Giles, David, Kelly, John and Draper, Nick 2016. Alterations in autonomic cardiac modulation in response to normobaric hypoxia. European Journal of Sport Science. https://doi.org/10.1080/17461391.2016.1207708
AuthorsGiles, David, Kelly, John and Draper, Nick
Abstract

Purpose: The present study aimed to determine if autonomic cardiac modulation was influenced by acute exposure to normobaric hypoxia. Method: Ten healthy male lowland dwellers completed five block-randomised single-blinded, crossed-over acute exposures to a normobaric hypoxic environment, each separated by 24 hours’ recovery (20.3%, 17.4%, 14.5%, 12.0% and 9.8% FIO2). Supine recordings were made of arterial oxygen saturation and electrocardiogram (ECG). RR intervals from the ECG trace were analysed for time (SDNN, lnRMSSD), frequency (lnVLF, lnLF, lnHF, lnTP, LFnu, and HFnu), and nonlinear (DFA-α1 and SampEn) heart rate variability components. Results: A significant reduction in arterial SaO2 occurred with reduced FIO2, along with a rise in heart rate (Cohen’s d = 1.16, 95% Confidence Interval [2.64–6.46]), significant at 9.8% FIO2. A decrease in autonomic cardiac modulation was also found as shown by a statistically significant (at 9.8% FIO2) decrease in lnTP (d = 1.84 [1.74–1.94]), and SampEn (d = 0.98 [0.83–1.12]) and an increase in DFA-α1 (d = 0.72 [0.60–0.84]) from normoxia at 9.8% FIO2. Conclusion: The decrease in variability indicated a reduction in autonomic cardiac modulation. There appears to be a threshold ∼9.8% FIO2 (∼6000 m equiv.), below which significant alterations in autonomic control occur.

KeywordsNormobaric hypoxia; Autonomic nervous system; Heart rate variability; Sample entropy
Year2016
JournalEuropean Journal of Sport Science
PublisherTaylor & Francis
ISSN1746-1391
1536-7290
Digital Object Identifier (DOI)https://doi.org/10.1080/17461391.2016.1207708
Web address (URL)http://hdl.handle.net/10545/621062
http://creativecommons.org/licenses/by/4.0/
hdl:10545/621062
Publication dates2016
Publication process dates
Deposited25 Nov 2016, 10:07
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ContributorsUniversity of Derby
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