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Primal Blueprint.com slash get-hyphen certified. The following Mark's daily Apple article

was written by Mark Sisson and is narrated by Brock Armstrong. Introducing Primal Beat, H.R.V.

Regular Marks Daily Apple readers already know my enthusiasm for the cutting-edge biofeedback technology

that's known as heart rate variability, or HRV.

There's a detailed introductory post over at Mark's Daily

Apple and another follow-up post that you can read there as well. In short, though, HRV measures the

variation in beat-to-beat intervals of your heart, providing a direct window into the functional

state of your autonomic nervous system.

A high HRV score that's indicative of more variation in beat-to-beat intervals

suggests a synchronistic balance between your parasympathetic, rest-and-digest nervous system

and your sympathetic, fight-or-flight nervous system. A lower-than-normal, and your sympathetic, fight or flight nervous system.

A lower than normal for that individual HRV score is indicative of sympathetic dominance,

a state of overstress or poor cardiovascular function.

While resting heart rate has been a gold standard to measure an athlete's general state of stress and recovery,

HRV takes biofeedback to the next level by delivering more nuanced readings

that accurately reveal conditions like hyperarousal or burnout.

...