Heart rate nonlinear dynamics during sudden hypoxia at 8,230 m simulated altitude

Abstract: Acute hypobaric hypoxia is associated with autonomic changes that bring a global reduction of linear heart rate variability (HRV). Although changes in nonlinear HRV can be associated with physiological stress and are relevant predictors of fatal arrhythmias in ischemic heart disease, to wh...

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Autores principales: Vigo, Daniel Eduardo, Pérez Lloret, Santiago, Videla, Alejandro J., Pérez Chada, Daniel, Hünicken, Horacio M., Mercuri, Jorge, Romero, Ramón, Nicola Siri, Leonardo C., Cardinali, Daniel Pedro
Formato: Artículo
Lenguaje:Inglés
Inglés
Publicado: Elsevier 2019
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Acceso en línea:https://repositorio.uca.edu.ar/handle/123456789/1637
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id I33-R139123456789-1637
record_format dspace
institution Universidad Católica Argentina
institution_str I-33
repository_str R-139
collection Repositorio Institucional de la Universidad Católica Argentina (UCA)
language Inglés
Inglés
topic SISTEMA NERVIOSO AUTONOMO
FRECUENCIA CARDIACA
HIPOXIA
ALTITUD
ESTUDIO DE CASOS
spellingShingle SISTEMA NERVIOSO AUTONOMO
FRECUENCIA CARDIACA
HIPOXIA
ALTITUD
ESTUDIO DE CASOS
Vigo, Daniel Eduardo
Pérez Lloret, Santiago
Videla, Alejandro J.
Pérez Chada, Daniel
Hünicken, Horacio M.
Mercuri, Jorge
Romero, Ramón
Nicola Siri, Leonardo C.
Cardinali, Daniel Pedro
Heart rate nonlinear dynamics during sudden hypoxia at 8,230 m simulated altitude
topic_facet SISTEMA NERVIOSO AUTONOMO
FRECUENCIA CARDIACA
HIPOXIA
ALTITUD
ESTUDIO DE CASOS
description Abstract: Acute hypobaric hypoxia is associated with autonomic changes that bring a global reduction of linear heart rate variability (HRV). Although changes in nonlinear HRV can be associated with physiological stress and are relevant predictors of fatal arrhythmias in ischemic heart disease, to what extent these components vary in sudden hypobaric hypoxia is not known. Methods: Twelve military pilots were supplemented with increasing concentrations of oxygen during decompression to 8,230 m in a hypobaric chamber. Linear and nonlinear HRV was evaluated at 8,230 m altitude before, during and after oxygen flow deprivation. Linear HRV was assessed through traditional time- and frequency- domain analysis. Nonlinear HRV was quantified through the short term fractal correlation exponent alpha (αs) and the Sample Entropy index (SampEn). Results: Hypoxia was related to a decrease in linear heart rate variability indexes at all frequency levels. A non significant decrease in αs (basal: 1.39 ± 0.07, hypoxia: 1.11 ± 0.13, recovery: 1.41 ± 0.05, p = 0.054) and a significant increase in SampEn (basal: 1.07 ± 0.11, hypoxia: 1.45 ± 0.12, recovery: 1.43 ± 0.09, p = 0.018) were detected. Conclusions: The observed pattern of diminished linear heart rate variability and increased nonlinear heart rate variability is similar to that seen in subjects undergoing heavy exercise or in patients with ischemic heart disease and high risk for ventricular fibrillation.
format Artículo
author Vigo, Daniel Eduardo
Pérez Lloret, Santiago
Videla, Alejandro J.
Pérez Chada, Daniel
Hünicken, Horacio M.
Mercuri, Jorge
Romero, Ramón
Nicola Siri, Leonardo C.
Cardinali, Daniel Pedro
author_facet Vigo, Daniel Eduardo
Pérez Lloret, Santiago
Videla, Alejandro J.
Pérez Chada, Daniel
Hünicken, Horacio M.
Mercuri, Jorge
Romero, Ramón
Nicola Siri, Leonardo C.
Cardinali, Daniel Pedro
author_sort Vigo, Daniel Eduardo
title Heart rate nonlinear dynamics during sudden hypoxia at 8,230 m simulated altitude
title_short Heart rate nonlinear dynamics during sudden hypoxia at 8,230 m simulated altitude
title_full Heart rate nonlinear dynamics during sudden hypoxia at 8,230 m simulated altitude
title_fullStr Heart rate nonlinear dynamics during sudden hypoxia at 8,230 m simulated altitude
title_full_unstemmed Heart rate nonlinear dynamics during sudden hypoxia at 8,230 m simulated altitude
title_sort heart rate nonlinear dynamics during sudden hypoxia at 8,230 m simulated altitude
publisher Elsevier
publishDate 2019
url https://repositorio.uca.edu.ar/handle/123456789/1637
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