Abstract
We show that the transitions which occur between close orders of synchronization in the cardiorespiratory system are mainly due to modulation of the cardiac and respiratory processes by low-frequency components. The experimental evidence is derived from recordings on healthy subjects at rest and during exercise. Exercise acts as a perturbation of the system that alters the mean cardiac and respiratory frequencies and changes the amount of their modulation by low-frequency oscillations. The conclusion is supported by numerical evidence based on a model of phase-coupled oscillators, with white noise and lowfrequency noise. Both the experimental and numerical approaches confirm that low-frequency oscillations play a significant role in the transitional behavior between close orders of synchronization.
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Kenwright, D.A., Bahraminasab, A., Stefanovska, A. et al. The effect of low-frequency oscillations on cardio-respiratory synchronization. Eur. Phys. J. B 65, 425–433 (2008). https://doi.org/10.1140/epjb/e2008-00199-4
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DOI: https://doi.org/10.1140/epjb/e2008-00199-4