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Proceedings Paper

Interactions between cardiac, respiratory, and brain activity in humans
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Paper Abstract

The electrical activity of the heart (ECG), respiratory function and electric activity of the brain (EEG) were simultaneously recorded in conscious, healthy humans. Instantaneous frequencies of the heart beat, respiration and α-waves were then determined from 30-minutes recordings. The instantaneous cardiac frequency was defined as the inverse value of the time interval between two consecutive R-peaks. The instantaneous respiratory frequency was obtained from recordings of the excursions of thorax by application of the Hilbert transform. To obtain the instantaneous frequency of α-waves, the EEG signal recorded from the forehead was first analysed using the wavelet transform. Then the frequency band corresponding to α-waves was extracted and the Hilbert transform applied. Synchronization analysis was performed and the direction of coupling was ascertained, using pairs of instantaneous frequencies in each case. It is shown that the systems are weakly bidirectionally coupled. It was confirmed that, in conscious healthy humans, respiration drives cardiac activity. We also demonstrate from these analyses that α-activity drives both respiration and cardiac activity.

Paper Details

Date Published: 23 May 2005
PDF: 11 pages
Proc. SPIE 5841, Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems III, (23 May 2005); doi: 10.1117/12.609437
Show Author Affiliations
Bojan Musizza, Jozef Stefan Institute (Slovenia)
Group for Nonlinear Dynamics and Synergetics (Slovenia)
Aneta Stefanovska, Group for Nonlinear Dynamics and Synergetics (Slovenia)


Published in SPIE Proceedings Vol. 5841:
Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems III
Nigel G. Stocks; Derek Abbott; Robert P. Morse, Editor(s)

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