Cardiovascular variabilities were recognized over 250 years ago, but only in the past 20
years has their apparent utility come to be appreciated. Technological advancement has …

Cardiovascular variables such as heart rate, arterial blood pressure, stroke volume and the
shape of electrocardiographic complexes all fluctuate on a beat to beat basis. These …

The last two decades have witnessed the recognition of a significant relationship between
the autonomic nervous system and cardiovascular mortality, including sudden cardiac …

Background The clinical relevance of HRV was first appreciated in 1965 when Hon and Lee
6 noted that fetal distress was preceded by alterations in interbeat intervals before any …

BACKGROUND The powers of the low-frequency (LF) and high-frequency (HF) oscillations
characterizing heart rate variability (HRV) appear to reflect, in their reciprocal relationship …

We have demonstrated previously that transfer function analysis can be used to precisely
characterize the respiratory sinus arrhythmia (RSA) in normal humans. To further investigate …

Research into cardiovascular variabilities intersects both human physiology and quantitative
modelling. This is because respiratory and Mayer wave (or 10 s) cardiovascular oscillations …

Contemporary measurement techniques permit the non-invasive observation of several
cardiovascular functions, both from the central and peripheral points of view. We show that …

Although enhanced sympathetic tone is a well recognized component of the autonomic
profile characteristic of congestive heart failure, the contribution of parasympathetic …

This study investigated the fluctuations of autonomic nervous activities during the menstrual
cycle. Twenty college females were tested for cardiovascular reactivity to mental challenge …