Your Body Is Giving You a Warning Sign—Most People Miss It
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0:00 - Introduction
3:15 - Heart Rate Variability in Cardiovascular Disease
4:35 - HRV in Healthy Individuals
5:45 - Critiques...
7:55 - What is a 'Low HRV'? How do we assess HRV?
10:40 - Keep 3 Things in Mind
11:58 - Main Points
References
[Study 459] Fang S-C, Wu Y-L, Tsai P-S. Heart rate variability and risk of all-cause death and cardiovascular events in patients with cardiovascular disease: a meta-analysis of cohort studies. Biol Res Nurs. 2019;21(6):540–551. doi:10.1177/1099800419877442
Funding/Conflicts: No Funding // No direct Conflicts of Interest
[Study 460] Jarczok MN, Weimer K, Braun C, William DP, Thayer JF, Gündel HO, Balint EM. Heart rate variability in the prediction of mortality: A systematic review and meta-analysis of healthy and patient populations. Neurosci Biobehav Rev. 2022;143:104915. doi:10.1016/j.neubiorev.2022.104915.
Funding/Conflicts: No Funding // No direct Conflicts of Interest
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#hrv #heartratevariability
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Video Transcript
That warning is coming from your heart
and you can detect it if you know how.
We'll get into it along with the science
behind it. This warning sign is called
heart rate variability or HRV. It's
simply the variation in time between
heartbeats. Your heart doesn't beat
exactly every x amount of milliseconds.
It varies. Hence the variability
component. Unfortunately, it's not
something that we can detect by simply,
you know, taking our pulse. But
fortunately, it does tell us an
indication of our health, our risk of
death, as we'll get into. The more
adaptable your heart rate variability,
the better one's health generally. Why
is that? It speaks to a concept of
veagal tone. This was a fascinating
concept that I learned about during my
exercise physiology masters program. In
fact, I'll explain why in a minute. But
veagal tone is an incredibly important
bundle of neurons that extend from your
brain stem to your heart. There it
controls your heart rhythm by branching
and innervating or connecting at two
major sites at the heart. The SA node or
sinoatrial node and the AV node or
atrial ventricular node. These regions
of your heart control your heart rhythm
and the vagus nerve actually slows your
heart down. So more veagal tone or
input, the slower your heart rate. Okay,
but why does any of that actually
matter? Well, multiple things influence
your vag nerve and its function. Your
blood pressure can influence the vagus
nerve through sensors in your heart and
the corroted artery called bar
receptors. Uh cortisol from stress can
suppress the veagal tone as well. And in
the reverse direction, chronic bodily
inflammation is a sign of reduced veagal
tone as the vagus nerve can also reduce
inflammation. There's plenty of other
ways of creating these connections. The
point being it isn't as simple as nerve
connect heart nerve good. There's a lot
of physiological
