Time delay correction of the synchrogram for optimized detection of cardiorespiratory coordination

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dc.contributor.authorKabir, M.
dc.contributor.authorSaint, D.
dc.contributor.authorNalivaiko, E.
dc.contributor.authorAbbott, D.
dc.contributor.authorBaumert, M.
dc.date.issued2011
dc.description.abstractThe 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.
dc.description.statementofresponsibilityMuammar M. Kabir, David A. Saint, Eugene Nalivaiko, Derek Abbott, Mathias Baumert
dc.identifier.citationMedical and Biological Engineering and Computing, 2011; 49(11):1249-1259
dc.identifier.doi10.1007/s11517-011-0822-3
dc.identifier.issn0140-0118
dc.identifier.issn1741-0444
dc.identifier.orcidAbbott, D. [0000-0002-0945-2674]
dc.identifier.orcidBaumert, M. [0000-0003-2984-2167]
dc.identifier.urihttp://hdl.handle.net/2440/68718
dc.language.isoen
dc.publisherPeter Peregrinus
dc.relation.granthttp://purl.org/au-research/grants/arc/DP110102049
dc.rights© International Federation for Medical and Biological Engineering 2011
dc.source.urihttps://doi.org/10.1007/s11517-011-0822-3
dc.subjectHeart; Heart rate variability; Coupling; Breathing frequency; Respiratory sinus arrhythmia; Phase locking; Synchronization
dc.titleTime delay correction of the synchrogram for optimized detection of cardiorespiratory coordination
dc.typeJournal article
pubs.publication-statusPublished

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