Interactions between cardiac, respiratory, and brain activity in humans

Bojan Musizza; Aneta Stefanovska

doi:10.1117/12.609437

23 May 2005 Interactions between cardiac, respiratory, and brain activity in humans

Bojan Musizza, Aneta Stefanovska

Proceedings Volume 5841, Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems III; (2005) https://doi.org/10.1117/12.609437
Event: SPIE Third International Symposium on Fluctuations and Noise, 2005, Austin, Texas, United States

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.

Citation Download Citation

Bojan Musizza and Aneta Stefanovska "Interactions between cardiac, respiratory, and brain activity in humans", Proc. SPIE 5841, Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems III, (23 May 2005); https://doi.org/10.1117/12.609437

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