Search results for "detrended fluctuation analysi"
showing 3 items of 13 documents
Persistence in complex systems
2022
Persistence is an important characteristic of many complex systems in nature, related to how long the system remains at a certain state before changing to a different one. The study of complex systems' persistence involves different definitions and uses different techniques, depending on whether short-term or long-term persistence is considered. In this paper we discuss the most important definitions, concepts, methods, literature and latest results on persistence in complex systems. Firstly, the most used definitions of persistence in short-term and long-term cases are presented. The most relevant methods to characterize persistence are then discussed in both cases. A complete literature r…
Slow 0.1 Hz Breathing and Body Posture Induced Perturbations of RRI and Respiratory Signal Complexity and Cardiorespiratory Coupling
2020
Objective: We explored the physiological background of the non-linear operating mode of cardiorespiratory oscillators as the fundamental question of cardiorespiratory homeodynamics and as a prerequisite for the understanding of neurocardiovascular diseases. We investigated 20 healthy human subjects for changes using electrocardiac RR interval (RRI) and respiratory signal (Resp) Detrended Fluctuation Analysis (DFA, α1RRI, α2RRI, α1Resp, α2Resp), Multiple Scaling Entropy (MSERRI1−4, MSERRI5−10, MSEResp1−4, MSEResp5−10), spectral coherence (CohRRI−Resp), cross DFA (ρ1 and ρ2) and cross MSE (XMSE1−4 and XMSE5−10) indices in four physiological conditions: supine with spontaneous breathing, stand…
Gender differences in elite athletes heart rate dynamics following a supra maximal complex effort
2017
Regarding the importance of recovery in sport performance assessment of post exercise Heart Rate HR Dynamics has become a useful tool to understand such an individual process Heart Rate Variability HRV analysis is widely used as a non invasive marker of Autonomic Nervous System regulation of HR where the nonlinear methods Detrended Fluctuation Analysis DFA have become a promising complementary analysis technique In order to deepen on the effects of supra maximal complex efforts integrating specific endurance and strength requirements on cardiac autonomic regulation our research group is working in different protocols looking for the analysis of specific responses under supra maximal exertio…