Welcome to Live Well Be Well, a show to help high performers improve their health and well-being.

If people want to increase their HIV, what would you suggest?

Yeah, first thing is, going back to earlier conversation, remove any performance anchor that will do it #1 so if you have a negative health practice.

So when people lose weight, HIV tends to go up.

When people eat higher quality food and their HIV tends to go up.

When people exercise, it goes up a ton.

Very few things will increase HIV more than exercise.

Those things will all shoot it up.

If you have, well, in fact, I'll add a little more.

Nothing will improve HIV more than sleep, especially if you have a a clinical or subclinical sleep disorder, which is really far more prevalent than people realize.

Those big huge practices will rocket shoot HIV up.

Past that we can start getting into some smaller impact stuff.

But that is the overwhelming majority time the people that we have doubled HRV in or had huge improvements in that that actually had problems with HRV.

It's because usually one of those 3 or 4 big rocks is being taken care of.

The ones that will move at the most for sure will be against sleep and exercise.

And if you have to hedge, this is probably when endurance cardiovascular like type of exercise does seem to win a little bit.

You're more likely to see improvements when you see that go up.

And that may or may not also be associated with the lower resting heart rate, but those are the biggest ways to move it.

What about cold plunges and saunas and things like that?

Because that's becoming huge.

Yeah, but they're not going to have even closeness impact as those other ones I said, so you can actually look.

So HRV will change with cold in a non common sensical way.

So if you get into HRV, you get into a cold plunge, you will see HRV drop actually immediately.

And this is exactly what it should be.

So maybe I'll back up a quick second.

HRV heart rate variability is again, this indirect marker of autonomic nervous system.

And your autonomic nervous system is in multiple parts.

But the easy way to think about it is just in two parts.

Although again, there's, there's more than this.

You rest and digest.

There's also freeze in there.

Then then you have your, your, your sympathetic drive, right?

So parasympathetic rest and digest and sympathetic Dr.

is arousal and up regulation and fight or flight and things like that.

Great.

HRV is telling us kind of where on that balance you are, how much of balance of sympathetic and how much of balance of parasympathetic, right?

So we tend to say a low HRV is sympathetic, like you're more switched towards that side.

It's not an on and off button, right?

It's a gradient here.

And a higher HRV means more parasympathetic, more down regulated.

So when we say these things like a really low HIV is associated with poor health, it's generally because that's associated with somebody being stuck in sympathetic Dr.

This could be stress, this could be, you know, poor sleep.

This like, OK, so that hopefully that kind of connects the picture a little bit of what's going on.

So if you get into a a cold water or anything like that, your HIV will drop immediately.

This is going to shoot you into sympathetic Dr.

This is why you get out and you feel you're exhilarated.

Your adrenaline has gone up.

Cortisol doesn't go up much actually, like a huge misnomer.

It doesn't really change that much after cold in men or women like in humans at least to be clear on that one.

But adrenaline will go way up, like way up and HIV will drop down considerably.

But if you look at that person, 30 minutes, 6090, up to several hours, 3 to 4 hours plus HIV will climb in those three hours, four hours, five hours post cold and will generally climb for at least three plus hours.

And it will go way past baseline.

And so if I wanted to hack a test, I would say, OK, take your HIV and let's just say it's 20 and get in the cold water.

You get out of the cold water might be 10.

Again, I'm making numbers up here, but an hour later, instead of being 20, you might be at 30 and two hours later you might be at 40.

So it'll have gone way up.

That didn't really change your Physiology.

This is just a compensatory response to going into a huge sympathetic Dr.

and now you have this parasympathetic rebound.

It's the exact same thing that happens with cortisol and exercise.

You go exercise right now.

Cortisol goes up in the few hours post exercise.

It'll come way back down in a compensatory response.

That's what it's supposed to do, right?

That's exactly what we're looking for.

It's the exact same reason why taking a hot shower or a hot bath at night gets you really hot, but then your body has this compensatory cooling and you have to cool down to fall asleep.

So getting really, really hot actually helps you get colder to fall asleep.

It's like hormatic stressors, right?

Like very classic over response.

So the question really though is if I chronically did ice plunges or cold plunges or something like that, would I chronically improve my HRV?

And I don't think that we really have any data to suggest it's a really going to be a strong effect.

If you like cold plunges from probably, you know, like different topic we can go into at some other point fine, but that's not and it wouldn't compare nearly as much as sleep and exercise.

Sauna does seem to be pretty effective at that.

And chronic sauna use has more data.

It has data on, there's observational studies on it, there's randomized controlled trials, we have epidemiology on it.

There's enough there.

In fact, there's enough molecular mechanism stuff there to say, OK, generally associated with positive health and probably a really good thing.

So I'd probably be more comfortable saying, OK, if you want to use.

And again, it's not sauna, it's hot.

So it's sauna or any other methodology of that.

But the way to think about that is you can get hot with exercise too, and exercise does a lot of other things for you that just sitting in a hot sauna doesn't do.

So if we're looking at pecking order again, I will really go back to exercise and sleep for sure.

And, of course, mental health.

And nutrition.

Yeah, but if you're already doing those things, or like my grandfather, he doesn't exercise, is never hit, wouldn't you know where to start?

But he uses the sauna like, great.

It's better than nothing.

There are positive things there.

The only thing I would really caution one against is saying, oh, the sauna is more important than the exercise, or I don't need to exercise because I'm in the sauna, or I don't worry about my sleep, I'm doing my sauna like it.

The problem we have with these hacks and stuff, not to call a sauna hack, but you get the point, is when they exceed the baseline stuff.

So that's I think the most appropriate way to think about this.

Thanks so much for listening to hear the full episode.

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