PrefaceEditorsContributors1. Introduction to ECG Time Series Variability Analysis: A Simple OverviewHerbert F. Jelinek, David J. Cornforth, and Ahsan H. Khandoker2. Historical Development of HRV AnalysisAndreas Voss3. A Descriptive Approach to Signal ProcessingDragana Baji?, Goran Dimi?, Tatjana Lon?ar-Turukalo, Branislav Milovanovi?, and Nina Japundzi?-Zigon4. Linear and Nonlinear Parametric Models in Heart Rate Variability AnalysisGaetano Valenza, Luca Citi, and Riccardo Barbieri5. Assessing Complexity and Causality in Heart Period Variability through a Model-Free Data-Driven Multivariate ApproachAlberto Porta, Luca Faes, Giandomenico Nollo, Anielle C. M. Takahashi, and Aparecida M. Catai6. Visualization of Short-Term Heart Period Variability with Network Tools as a Method for Quantifying Autonomic DriveDanuta Makowiec, Beata Graff, Agnieszka Kaczkowska, Grzegorz Graff, Dorota Wejer, Joanna Wdowczyk, Marta ?arczy?ska-Buchowiecka, Marcin Grucha?a, and Zbigniew R. Struzik7. Analysis and Preprocessing of HRV-Kubios HRV SoftwareMika P. Tarvainen, Jukka A. Lipponen, and Pekka Kuoppa8. Multiscale Complexity Measures of Heart Rate Variability-A Window on the Autonomic Nervous System FunctionDavid J. Cornforth and Herbert F. Jelinek9. BP and HR Interactions: Assessment of Spontaneous Baroreceptor Reflex SensitivityTatjana Lon?ar-Turukalo, Nina Japundzi?-Zigon, Olivera Sarenac, and Dragana Baji?10. Tone-Entropy Analysis of Heart Rate Variability in Cardiac Autonomic NeuropathyChandan Karmakar, Ahsan H. Khandoker, Herbert F. Jelinek, and Marimuthu Palanis