Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/68718
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Type: Journal article
Title: Time delay correction of the synchrogram for optimized detection of cardiorespiratory coordination
Author: Kabir, M.
Saint, D.
Nalivaiko, E.
Abbott, D.
Baumert, M.
Citation: Medical & Biological Engineering & Computing, 2011; 49(11):1249-1259
Publisher: Peter Peregrinus
Issue Date: 2011
ISSN: 0140-0118
1741-0444
Statement of
Responsibility: 
Muammar M. Kabir, David A. Saint, Eugene Nalivaiko, Derek Abbott, Mathias Baumert
Abstract: The cardiorespiratory synchrogram, a graphical tool based on the stroboscopic technique, is an established method for evaluating phase-locking between cardiac and respiratory oscillators. In the original method, the phase of the respiratory oscillator is observed at the instants of time when the phase of the cardiac oscillator attains a certain value. In this article, we introduced an additional adaptive delay in the cardiac oscillator based on the maximisation of the cross-correlation or symbolic coupling traces between the phases of respiration and the delayed R-R intervals. We then investigated phase coordination in thirteen normal subjects (five males, eight females; age: 19-24 years) for different body postures. Cardiorespiratory coordination was observed to be significantly reduced in the upright position (supine vs. upright: 11.9 ± 5.1 vs. 6.9 ± 3.6, P < 0.05). Compared to the original algorithm we observed an increase in the detection of average cardiorespiratory coordination (supine original vs. delay: 11.9 vs. 18.9%), together with a decrease in standard deviation of the percentage of coordination in all the subjects, after introducing the heart rate delay (supine original vs. delay: 5.1 vs. 4.4%). In conclusion, the performance of the synchrogram technique was improved by including an adaptive delay in the cardiac oscillator.
Keywords: Heart; Heart rate variability; Coupling; Breathing frequency; Respiratory sinus arrhythmia; Phase locking; Synchronization
Rights: © International Federation for Medical and Biological Engineering 2011
RMID: 0020114720
DOI: 10.1007/s11517-011-0822-3
Grant ID: http://purl.org/au-research/grants/arc/DP110102049
Appears in Collections:Medical Sciences publications

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