Dr. Kevin Tracey

They're all proprietary.

Right.

So...

Now you go into the billions of web impressions on vagus nerve and heart rate variability, and you come up with a lot of what I find to be very confusing information that you alluded to.

And here it comes down to what I was pleading for a half hour ago.

We just really need more large, well-controlled, well-randomized, statistically meaningful clinical trials to answer specific questions about the relationship of heart rate variability to health.

I don't think we have a good understanding of the underlying mechanisms.

I think that's very well said.

And I think at the end of the day, you have devices with different algorithms that are all proprietary.

So if you have money and you want to spend it on wearables,

and you think you're getting, it makes you feel better to know your heart rate variability, great.

I'm not, it's fine.

That's what makes the world go round.

People do different things.

But I think if you're planning your life's medical course around it, because you think people understand it, then I think that that's not right.

Then it should be let the buyer beware.

I do think it's true, and I don't think there's an exercise physiologist on the planet who would disagree with you with the importance of the recovery to baseline and or the importance of a carefully and well-measured VO2 max as an indicator of health.

And I think there are various exercise advocates –

recommending different strategies to get more VO2 max or to improve your VO2 max or to improve your recovery.

I'm not expert on that.