A progressive decline in maximum heart rate (mHR) is a fundamental aspect of aging in
humans and other mammals. This decrease in mHR is independent of gender, fitness, and …

The cardiac pacemaker ignites and coordinates the contraction of the whole heart,
uninterruptedly, throughout our entire life. Pacemaker rate is constantly tuned by the …

In this work we study the characteristics of heart rate variability (HRV) as a function of age
and gender. Our analysis covers a wider age range than that studied so far. It includes …

Background: The time variation between consecutive heartbeats is commonly referred to as
heart rate variability (HRV). Loss of complexity in HRV has been documented in several …

Heart rate and heart rate variability (HRV) are mainly determined by the autonomic nervous
system (ANS), which interacts with receptors on the sinoatrial node (SAN; the heart's primary …

Heart rate (HR) and HR variability (HRV), predictors of over-all organism health, are widely
believed to be driven by autonomic input to the sinoatrial node (SAN), with sympathetic input …

Objective The aim of this study was to assess age-related changes in cardiac autonomic
modulation and heart rate variability (HRV) and their association with spontaneous and …

Biological rhythms exist in organisms at all levels of complexity, in most organs and at
myriad time scales. Our own biological rhythms are driven by energy emitted by the sun …

Background Hypertensive heart disease is associated with sinoatrial node (SAN)
dysfunction and reductions in heart rate variability (HRV). Alterations in HRV could occur in …

Heart rate is accelerated to match physiological demands through the action of
noradrenaline on the cardiac pacemaker. Noradrenaline is released from sympathetic …