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Signal, Image and Video Processing

, Volume 13, Issue 8, pp 1521–1528 | Cite as

Detecting changes in cardiovascular interaction during postural stress using directed coherence

  • M. C. Helen MaryEmail author
  • Dilbag Singh
  • K. K. Deepak
Original Paper
  • 56 Downloads

Abstract

In the study, Granger causality frequency analysis based on directed coherence is utilized to detect and quantify directional interaction among heart rate, systolic blood pressure and respiratory signal during postural stress from supine to standing and from standing to supine. The directional information flow during postural stress from supine to standing is dominant on cardiorespiratory interaction, vasculo-respiratory interaction and cardiovascular interaction. Conversely, the reverse postural stress from standing to supine resulted in a contrary effect on both cardiorespiratory and cardiovascular interactions without significant change in vasculo-respiratory interaction. Based on the power change, we observed that postural stress gets affected by both cardiorespiratory and cardiovascular but not by vasculo-respiratory system. Therefore, the directed coherence power calculated for each interaction helps to identify short-term regulatory mechanism during postural stress.

Keywords

Frequency analysis Directed coherence (DC) Cardiovascular Respiration Postural stress 

Abbreviations

ABP

Arterial blood pressure

AR

Autoregressive

DC

Directed coherence

ECG

Electrocardiogram

HF

High frequency

LF

Low frequency

MVAR

Multivariate autoregressive

RESP

Respiration

PSD

Power spectral density

List of symbols

A

Model coefficient matrix

\(\varGamma \)

Coherence

\(\gamma \)

Directed coherence power

Notes

Acknowledgements

The authors would like to thank Biomedical Instrumentation Laboratory, Department of Instrumentation and Control, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar, and to all volunteers who took part in the recording.

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Instrumentation and ControlDr. B. R. Ambedkar National Institute of TechnologyJalandharIndia
  2. 2.Department of PhysiologyAll India Institute of Medical ScienceNew DelhiIndia

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