Background Heart rate variability is used as an assessment method for cardiac autonomic
modulation. Since the Task Force's publication on heart rate variability in 1996, the …

The utility of heart rate variability (HRV) for characterizing psychological stress is primarily
impacted by methodological considerations such as study populations, experienced versus …

Sleep is a physiological process involving different biological systems, from molecular to
organ level; its integrity is essential for maintaining health and homeostasis in human …

Dispersion entropy (DispEn) is a recently introduced entropy metric to quantify the
uncertainty of time series. It is fast and, so far, it has demonstrated very good performance in …

Since the pioneering studies of the 1960s, heart rate variability (HRV) has become an
increasingly used non-invasive tool for examining cardiac autonomic functions and …

Heart rate variability is a recognized tool for the estimation of cardiac autonomic
modulations. Recently, several studies have advanced the field of heart rate variability in …

Sleep is divided into two main sleep stages:(1) non-rapid eye movement sleep (non-REMS),
characterized among others by reduced global brain activity; and (2) rapid eye movement …

Nonlinear techniques have been widely and successfully used to analyze the vibration
signals in rotary machines due to the nonlinear nature of such times series. We have …

There are numerous methods and approaches available for time-series analysis. This
chapter presents selected methods, which are or at least could be useful when analyzing …

Rhythmic changes of blood pressure, heart rate, and other cardiovascular measures have
drawn the attention of several investigators, since these oscillations can shed light onto the …