Monitoring Heart Rate Variability: A Key to Longevity with Torkil Faero

The heart rate variability is the variation between heartbeats. So if you have a well-regulated nervous system, then when you breathe in, then the heart rate will go up a little bit because there's more oxygen in the lungs. And when you breathe out, your heart rate will slow down just a little bit, just measured in milliseconds, because there's less oxygen in the lungs. So the heart will save a little bit of energy this way. But if you are in the stress state, then your ancient neurological system will interpret it that your life is at stake and you have to use all your forces, including when there is less oxygen in the lungs. So then the heart will beat at a very steady pace, like a clock, like a watch.