Dr. Jay Wiles

And over the course of time, it's actually gone from 100 milliseconds

to 90 to 85, well, the absolute value is still much higher than yours.

But I would say that you're showing way better adaptations from a nervous system perspective than they are.

So high isn't what we're aiming for here because this is not a...

It's not a metric of virtue.

And I think that this is where people get into a lot of trouble.

They see whoever health influencer posts their aura or whoop score on their Instagram page.

And they've got a heart rate variability score of 150 milliseconds.

And like, shit, like I've got mine is like 25.

And that's when I get the email like, am I going to die?

Like, am I going to have like some cardiovascular issues or panic attacks that are going to cause me to die?

And I always say, hey, let's pump the brakes.

Let's pump the vagal brake here and just relax for a second.

Like what's most important here is not looking at whether or not it's high or low.

It's looking at stability across time.

And one metric that's not used very often, but I use this a lot within my clinic.

So I work with a lot of pro athletes, you know, ranging from individuals in the MLB,

NFL, Formula One, et cetera.

And one of the metrics that I use for them with recovery is actually not looking at just the daily absolute value score that you might get from WHOOP, Aura, et cetera.

I actually look at a number called HRV-CV, which is the coefficient of variation of heart rate variability, which is a long-winded way of saying from day to day, how much does your HRV vary?