Autonomic characteristics of panickers, blood phobics, and nonanxious controls were
compared with a variety of cardiovascular measures, including spectral analysis of the …

Automatic analysis of heart rate variability from Hotter recordings may be invalidated by beat
recognition errors and recording artefact, necessitating filtering and editing of the computer …

We studied heart rate variability in 49 uncomplicated diabetics (27 with insulin therapy; 22
with oral hypoglycemic agents) and in 40 age-matched controls. An automatic …

This work studies the frequency behavior of a least-square method to estimate the power
spectral density of unevenly sampled signals. When the uneven sampling can be modeled …

Background In normal humans, variability of blood pressure, RR interval, and sympathetic
activity occurs predominantly at a low frequency (LF; 0.04 to 0.14 Hz) and a high frequency …

The rhythm of the heart is influenced by both the sympathetic and parasympathetic branches
of the autonomic nervous system. There are also some feedback mechanisms modulating …

A model is developed to describe and quantitate the error in RR interval measurement due
to the finite sampling frequency. The measured RR interval is modeled as the sum of the true …

Beat-to-beat fluctuations in heart rate (HR) or instantaneous HR is mainly determined by
activity of the cardiac sympathetic and parasympathetic systems. Despite the need for …

To evaluate possible autonomic nervous system (ANS) dysfunction in patients with chronic
obstructive pulmonary disease (COPD) in the absence of any hypoxic neuronal damage, we …

Four components of the heart period power spectrum—ultra low frequency (< 0.0033 Hz),
very low frequency (0.0033 to< 0.04 Hz), low frequency (0.04 to< 0.15 Hz) and high …