Dr. Andy Galpin

Actually, I wouldn't know.

I'd have to be like, okay, well, what device was that on?

What conditions?

Like, I still don't know.

So the benefit of something like a heart rate is it's clear and defined for the most part, good and bad.

HRV is not.

It's really a moving target.

So it's more sensitive, but it tells us information.

The variability, like I said, tells us a lot.

In addition to that, once I establish your normal standard deviation, when you start exceeding one, especially two standard deviations for more than a couple of days, something is happening.

And I will tell you right now, you will see that way before you start seeing changes in resting heart rate.

That problem is going to occur way before.

You don't want to overreact to a single day, as I mentioned.

So you wake up, your HRV and your devices will pick a number.

70 normally.

Some people will stay within 70 to 75 to 65.

So their standard deviation will be like 5 milliseconds.

Some people's normal standard deviation is 20.

30 days.

Measure for 30 days.