2,126 Hits in 8.2 sec

Joint symbolic dynamics for the assessment of cardiovascular and cardiorespiratory interactions

M. Baumert, M. Javorka, M. Kabir
2014 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences  
Firstly, respiratory sinus arrhythmia (RSA) [26] is characterized by cyclic oscillation of HR, with acceleration during the inspiratory phase and deceleration during expiration [27] .  ...  (f) Cardiovascular diseases In patients with idiopathic dilated cardiomyopathy, word type distribution of HR and SAP dynamics changed from a predominance of baroreflex patterns towards patterns of alternating  ... 
doi:10.1098/rsta.2014.0097 pmid:25548272 pmcid:PMC4281868 fatcat:o6jg5xmbqjbqjpmz24ntidcqhe

Heart rate dynamics and cardiorespiratory coordination in diabetic and breast cancer patients

H. Bettermann, M. Kroz, M. Girke, C. Heckmann
2001 Clinical Physiology  
with a predominance of cyclically recurrent phase locking patterns unveiled a clear transition from higher to lower cardiorespiratory coordination ratios and to a loss of coordination capability in metastasized  ...  The most prominent alterations were found for the binary pattern predominance and for the ratio of heart rate and respiration.  ...  Acknowledgements H.B. acknowledges financial support from the Weleda AG, Schwäbisch Gmünd, Germany. M.K. acknowledges financial support from the Humanus-Institut e.V., Öschelbronn, Germany.  ... 
doi:10.1046/j.1365-2281.2001.00342.x pmid:11442574 fatcat:x2gmdcbdcvhcjbsrtn3tzpalw4

Automatic Detection of the Cyclic Alternating Pattern of Sleep and Diagnosis of Sleep-Related Pathologies Based on Cardiopulmonary Resonance Indices

Jiajia Cui, Zhipei Huang, Jiankang Wu
2022 Sensors  
In terms of the cyclic alternating pattern, the average recognition rate of A-phase reaches 84.7% on the CAP Sleep Database of 108 cases of people.  ...  Considering the connection between the human heart and brain, our study explores the feasibility of using cardiopulmonary features to automatically detect the cyclic alternating pattern of sleep and hence  ...  Acknowledgments: The authors would like to thank the doctors of China-Japan Friendship Hospital for their carefully interpretation.  ... 
doi:10.3390/s22062225 pmid:35336396 pmcid:PMC8952285 fatcat:nxvdwtboejayndk3apcivcfyqa

Attractor competition enriches cortical dynamics during awakening from anesthesia [article]

Núria Tort-Colet, Cristiano Capone, Maria V. Sanchez-Vives, Maurizio Mattia
2019 bioRxiv   pre-print
This stage is followed by the abrupt onset of an infra-slow (~0.2 Hz) alternation between sleep-like oscillations and activated states.  ...  Cortical slow oscillations (≤1 Hz) are a hallmark of slow-wave sleep and deep anesthesia across animal species.  ...  Acknowledgments This work was financially supported by the Spanish Ministry of science BFU2017-85048-R and by CERCA Programme / Generalitat de Catalunya, and by the EU Horizon 2020 Research and Innovation  ... 
doi:10.1101/517102 fatcat:yqob3cz3czdgrenmjm2aamzaae

A Recurrent Increase of Synchronization in the EEG Continues from Waking throughout NREM and REM Sleep

Ralf Landwehr, Andreas Volpert, Ahmad Jowaed
2014 ISRN Neuroscience  
Pointwise transinformation (PTI) provides a quantitative nonlinear approach to spatiotemporal synchronization patterns of the rhythms of coupled cortical oscillators.  ...  Thus, a fundamental coupling pattern with recurrent increases of synchronization in the EEG ("RISE") seems to exist during the brain's resting state.  ...  This regional distribution of synchronization also corresponds to the regional EEG slow-wave synchronization during sleep cyclic alternating pattern (CAP) A1 [33] .  ... 
doi:10.1155/2014/756952 pmid:24967318 pmcid:PMC4045569 fatcat:2js2i2mmmrclxbzgix3bk2p6ya

Musical rhythms in heart period dynamics: a cross-cultural and interdisciplinary approach to cardiac rhythms

H. Bettermann, D. Amponsah, D. Cysarz, P. van Leeuwen
1999 American Journal of Physiology. Heart and Circulatory Physiology  
The results show that during sleep certain classes, specific to individuals, occurred in a cyclically recurrent manner and many times more often than expected.  ...  Using a hierarchical rhythm pattern scheme closely related to the Derler Rhythm Classification (from jazz theory), we calculated the predominance and stability of pattern classes.  ...  Address for reprint requests and other correspondence: H. Bettermann, Dept. of Clinical Research, Gemeinschaftskrankenhaus, 58313 Herdecke, Germany (E-mail:  ... 
doi:10.1152/ajpheart.1999.277.5.h1762 pmid:10564129 fatcat:5qkcmvnnpbcwxmpptrzfhf5hui

Identifying Phase-Amplitude Coupling in Cyclic Alternating Pattern using Masking Signals

Chien-Hung Yeh, Wenbin Shi
2018 Scientific Reports  
Identification of the features in cyclic alternating pattern (CAP) sequences can contribute to the development of sleep microstructural analysis.  ...  Judiciously classifying phase-A subtypes in cyclic alternating pattern (CAP) is critical for investigating sleep dynamics.  ...  Due to the growing interests in sleep microstructure, we investigate the normal and abnormal sleep physiologies and compare PACs under phase-A subtypes in CAP.  ... 
doi:10.1038/s41598-018-21013-9 pmid:29422509 pmcid:PMC5805690 fatcat:mxxjpmt57fcf3ksxcqprqvswrm

Comparison of two different approaches in the detection of intermittent cardiorespiratory coordination during night sleep

Henrik Bettermann, Dirk Cysarz, Peter Van Leeuwen
2002 BMC Physiology  
The first method is based on a combination of respiratory flow and electrocardiogram recordings and determines the relative phases of R waves between successive onsets of inspiration.  ...  Furthermore, in most subjects the pattern predominance (PP) showed a pronounced oscillation which is most likely linked with the dynamics of sleep stages.  ...  The authors would also like to thank Roland Zerm and Matthias Kröz for providing the data from the Berlin study center (subjects axx).  ... 
pmid:12464159 pmcid:PMC140027 fatcat:smxi5mck3ve3vlzihmlqh4yhlm

Cross Signal Identification For Psg Applications

Carmen Grigoraş, Victor Grigoraş, Daniela Boişteanu
2008 Zenodo  
Our computed analysis includes a learning phase based on cross signal PSG annotation.  ...  A nonlinear principal component analysis (NLPCA) method was considered for feature extraction and support vector machine for classification/recognition.  ...  Repeated apneas induce changes into the electrocardiogram (ECG) due to neuroautonomic and mechanical factors, such as cyclic variation in heart rate, or cyclic variations in ECG amplitude or morphology  ... 
doi:10.5281/zenodo.1334641 fatcat:4l2aicpezzbifnyvz36abjtrlu

Quantification of Brain Macrostates Using Dynamical Nonstationarity of Physiological Time Series

Charles-Francois Vincent Latchoumane, Jaeseung Jeong
2011 IEEE Transactions on Biomedical Engineering  
Based on the assumption of nonlinear, deterministic brain dynamics, we also demonstrate that dynamical nonstationarity analysis is useful to quantify brain macrostates (Sleep stages I, II, III, IV, and  ...  In this proposed approach, a phase-spacebased dynamical dissimilarity map (DDM) is used to detect transitions between dynamically stationary microstates in the time series, and Tsallis time-dependent entropy  ...  ACKNOWLEDGMENT The authors would like to thank Drs. Lee  ... 
doi:10.1109/tbme.2009.2034840 pmid:19884077 fatcat:zj7cgpyrhrbnbliiwrhuynrdwu

Attractor competition enriches cortical dynamics during awakening from anesthesia

Núria Tort-Colet, Cristiano Capone, Maria V. Sanchez-Vives, Maurizio Mattia
2021 Zenodo  
., 2021, Cell Reports 35, 109270 June 22, 2021 @ 2021 The Authors.  ...  Acknowledgments This work was supported by the Spanish Ministry of science BFU2017-85048-R and by CERCA Programme/Generalitat de Catalunya, and by the EU Horizon 2020 Research and Innovation Program under  ...  Gonzalez-Liencres and T. Donegan for editing assistance, P. Del Giudice and M. Massimini for useful discussion and the reviewers for critical suggestions.  ... 
doi:10.5281/zenodo.5767244 fatcat:zrbaayanlvd4xcupm4acy7srby

Flickering body temperature anticipates criticality in hibernation dynamics

Daniel Oro, Lídia Freixas
2021 Royal Society Open Science  
Hibernation dynamics showed flickering, a phenomenon occurring when a system rapidly moves back and forth between two alternative attractors preceding the upcoming major regime shift.  ...  Gradual changes in air temperature drove transient between states of hibernation and activity, and also drove hysteresis.  ...  Two anonymous reviewers provided very helpful comments for improving the MS.  ... 
doi:10.1098/rsos.201571 pmid:33614089 pmcid:PMC7890501 fatcat:r7cvme6adrdwveam3s6v25wsxm

Chaos in the brain: a short review alluding to epilepsy, depression, exercise and lateralization

S.N. Sarbadhikari, K. Chakrabarty
2001 Medical Engineering and Physics  
The common point of reference could be nonlinear dynamics.  ...  The purpose of this review is to study those nonlinear/chaotic interactions and point towards new theoretical models incorporating the oscillation caused by the same neurotransmitter acting on its different  ...  Acknowledgements The authors are thankful to the anonymous referees for their critical reviews, which have helped in improving the quality of the paper.  ... 
doi:10.1016/s1350-4533(01)00075-3 pmid:11574252 fatcat:pmzgyrsvj5f6xewfcyl2rtcd3a

Toward a Neurodynamical Understanding of Ictogenesis

Michel Le Van Quyen, Vincent Navarro, Jacques Martinerie, Michel Baulac, Francisco J. Varela
2003 Epilepsia  
The authors review their work on nonlinear EEG analysis and provide consistent evidences that dynamical changes in the neural activity allows the characterization of a preictal state several minutes before  ...  Although considerable information on cellular and network mechanisms of epilepsy exists, it is still not understood why, how, and when the transition from interictal to ictal state takes place.  ...  integration during cognitive processes; philosophical and empirical studies of the "neurophenomenology" of human consciousness; and mathematical studies on the nonlinear dynamical analysis of brain activity  ... 
doi:10.1111/j.0013-9580.2003.12007.x pmid:14641559 fatcat:gxwxoy4itvhxpdcc5j3o6qio3m

Envelope Analysis of the Airflow Signal To Improve Polysomnographic Assessment of Sleep Disordered Breathing

Javier A. Díaz, José M. Arancibia, Alejandro Bassi, Ennio A. Vivaldi
2014 Sleep  
Patients or Participants: Recordings representative of different degrees of sleep disordered breathing (SDB) severity or illustrative of the covariation between breathing and particularly relevant factors  ...  199 Envelope Analysis for Sleep-Disordered Breathing-Díaz et al Given the drastic impact on morbidity and mortality, 1-9 increasing prevalence, 3,10-13 and efficient treatability of sleep disordered breathing  ...  Expectedly, this RDV dynamics coincides with electrocortical instability, detected on the EEG with cyclic alternating pattern (CAP) analysis. 42, 43 The increase in the rate of A2 and A3 subtypes of  ... 
doi:10.5665/sleep.3338 pmid:24470709 pmcid:PMC3902884 fatcat:ei4bkc4kdbdgngdvpnmjgv57f4
« Previous Showing results 1 — 15 out of 2,126 results