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Author Garde, A. ♦ Giraldo, B. F. ♦ Jané, R. ♦ Latshang, T. D. ♦ Turk, A. J. ♦ Hess, T. ♦ Bosch, M. M. ♦ Barthelmes, D. ♦ Merz, T. M. ♦ Hefti, J. Pichler ♦ Schoch, O. D. ♦ Bloch, K. E.
Source SpringerLink
Content type Text
Publisher Springer Berlin Heidelberg
File Format PDF
Copyright Year ©2015
Language English
Subject Domain (in DDC) Technology ♦ Medicine & health
Subject Keyword High-altitude periodic breathing ♦ Cardiorespiratory characterization ♦ Time-varying spectral analysis ♦ Acclimatization ♦ Hypoxia ♦ Human Physiology ♦ Biomedical Engineering ♦ Imaging ♦ Radiology ♦ Computer Applications
Abstract This work investigates the performance of cardiorespiratory analysis detecting periodic breathing (PB) in chest wall recordings in mountaineers climbing to extreme altitude. The breathing patterns of 34 mountaineers were monitored unobtrusively by inductance plethysmography, ECG and pulse oximetry using a portable recorder during climbs at altitudes between 4497 and 7546 m on Mt. Muztagh Ata. The minute ventilation (V$_{E}$) and heart rate (HR) signals were studied, to identify visually scored PB, applying time-varying spectral, coherence and entropy analysis. In 411 climbing periods, 30–120 min in duration, high values of mean power (MP$^{VE}$) and slope (MSlope$^{VE}$) of the modulation frequency band of V$_{E}$, accurately identified PB, with an area under the ROC curve of 88 and 89 %, respectively. Prolonged stay at altitude was associated with an increase in PB. During PB episodes, higher peak power of ventilatory (MP$^{VE}$) and cardiac (MP LF HR ) oscillations and cardiorespiratory coherence (MP LF Coher ), but reduced ventilation entropy (SampEn$^{VE}$), was observed. Therefore, the characterization of cardiorespiratory dynamics by the analysis of V$_{E}$ and HR signals accurately identifies PB and effects of altitude acclimatization, providing promising tools for investigating physiologic effects of environmental exposures and diseases.
ISSN 01400118
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2015-03-31
Publisher Place Berlin, Heidelberg
e-ISSN 17410444
Journal Medical and Biological Engineering and Computing
Volume Number 53
Issue Number 8
Page Count 14
Starting Page 699
Ending Page 712

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Source: SpringerLink