The European Physical Journal B

, Volume 65, Issue 3, pp 425–433

The effect of low-frequency oscillations on cardio-respiratory synchronization

Observations during rest and exercise


  • D. A. Kenwright
    • Department of PhysicsUniversity of Lancaster
  • A. Bahraminasab
    • Department of PhysicsUniversity of Lancaster
    • Department of PhysicsUniversity of Lancaster
    • Nonlinear Dynamics and Synergetics Group, Faculty of Electrical EngineeringUniversity of Ljubljana
  • P. V. E. McClintock
    • Department of PhysicsUniversity of Lancaster

DOI: 10.1140/epjb/e2008-00199-4

Cite this article as:
Kenwright, D.A., Bahraminasab, A., Stefanovska, A. et al. Eur. Phys. J. B (2008) 65: 425. doi:10.1140/epjb/e2008-00199-4


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.


05.45.Xt Synchronization; coupled Heart and lung dynamics87.18.Tt Noise in biological systems05.45.Tp Time series analysis

Copyright information

© Springer 2008