Heart Rate Variability
variation in the time intervals between heartbeats
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Videos Mentioning Heart Rate Variability

How Foods and Nutrients Control Our Moods
Andrew Huberman
The variation in time between heartbeats, used as a marker for autonomic nervous system tone; increasing it through EPA supplementation has been shown to improve symptoms of depression.

Dr. Michael Snyder on Continuous Glucose Monitoring and Deep Profiling for Personalized Medicine
FoundMyFitness
A measure of heart health; a variable heart rate is indicative of good health, while a constant rate suggests a problem.

Kelly Starrett Interview (Full Episode) | The Tim Ferriss Show (Podcast)
Tim Ferriss
A physiological metric used to assess recovery and readiness, discussed as a sophisticated training and recovery monitoring tool.

Polyvagal Theory: Why You Feel So Anxious All The Time - Dr Stephen Porges
Chris Williamson
A measure of the variation in time between heartbeats, which Dr. Porges was the first to quantify, used as an indicator of autonomic nervous system regulation.