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
Materias:	SISTEMA NERVIOSO AUTONOMO FRECUENCIA CARDIACA HIPOXIA ALTITUD ESTUDIO DE CASOS
Acceso en línea:	https://repositorio.uca.edu.ar/handle/123456789/1637
Aporte de:	Repositorio Institucional de la Universidad Católica Argentina (UCA) de Universidad Católica Argentina

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

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