Physics – Data Analysis – Statistics and Probability
Scientific paper
2007-01-29
Phys. Rev. Lett. 98, 054102 (2007)
Physics
Data Analysis, Statistics and Probability
in press (Physical Review Letters)
Scientific paper
10.1103/PhysRevLett.98.054102
Transitions in the dynamics of complex systems can be characterized by changes in the synchronization behavior of their components. Taking the human cardio-respiratory system as an example and using an automated procedure for screening the synchrograms of 112 healthy subjects we study the frequency and the distribution of synchronization episodes under different physiological conditions that occur during sleep. We find that phase synchronization between heartbeat and breathing is significantly enhanced during non-rapid-eye-movement (non-REM) sleep (deep sleep and light sleep) and reduced during REM sleep. Our results suggest that the synchronization is mainly due to a weak influence of the breathing oscillator upon the heartbeat oscillator, which is disturbed in the presence of long-term correlated noise, superimposed by the activity of higher brain regions during REM sleep.
Bartsch Ronny
Havlin Shlomo
Kantelhardt Jan W.
Penzel Thomas
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