We know the beat of our heart varies over time, increasing with exertion and slowing with rest or meditation. But, stable as those variations may appear, they vary even within those intervals. Dr.

Heart rate variability (HRV) typically increases with parasympathetic activation (rest-and-digest response) and decreases with sympathetic activation (fight-or-flight response). The autonomic nervous ...

ADELPHI, MD. -- For a thousand years, people have reported feeling better by meditating, but there has never been a systematic study that quantified stress and how much stress changes as a direct ...