Beat-to-Beat R-R intervals and systolic blood pressure (SBP) variability signals were used for a quantitative study of coupling strength and synchronization in non linear interaction of heart rate and systolic blood pressure during spontaneous and controlled breathing. In addition to linear analysis that was based on spectral and cross-spectral analysis, we applied the independence of complexity test, the recurrence and the cross recurrence quantification analysis in order to estimate the values of coupling and synchronization in the two conditions of experimentation. The results indicate that the non linear R-R:SBP interaction is influenced at a high degree by the respiratory component because coupling strength and synchronization resulted strongly reduced during controlled respect to spontaneous respiration. In particular, the recurrence quantification analysis enabled us to confirm that a non deterministic dynamics, mathematically supported by the so called relaxation of Lipschitz conditions, is at the basis in cardiovascular control system.
Measures of coupling strength and synchronization in non linear interaction of heart rate and systolic blood pressure in the cardiovascular control system
FEDERICI, Antonio;
2011-01-01
Abstract
Beat-to-Beat R-R intervals and systolic blood pressure (SBP) variability signals were used for a quantitative study of coupling strength and synchronization in non linear interaction of heart rate and systolic blood pressure during spontaneous and controlled breathing. In addition to linear analysis that was based on spectral and cross-spectral analysis, we applied the independence of complexity test, the recurrence and the cross recurrence quantification analysis in order to estimate the values of coupling and synchronization in the two conditions of experimentation. The results indicate that the non linear R-R:SBP interaction is influenced at a high degree by the respiratory component because coupling strength and synchronization resulted strongly reduced during controlled respect to spontaneous respiration. In particular, the recurrence quantification analysis enabled us to confirm that a non deterministic dynamics, mathematically supported by the so called relaxation of Lipschitz conditions, is at the basis in cardiovascular control system.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
