Posted on 02/21/2026 8:07:01 PM PST by SeekAndFind
Modern smart watches can measure an array of health indicators. Step counts and heart rates sit at the simpler end, while VO2 max and blood-oxygen levels are mainly of interest to committed health nuts. The newest addition to the category is heart-rate variability (HRV).
As its name suggests, HRV measures not how quickly the heart beats, but how regularly spaced those beats are. With heart rate a lower score is usually better, other things being equal, since it suggests a high level of cardiovascular fitness. When it comes to HRV, though, a higher number—that is, a more irregular pattern—is generally what you want.
HRV arises from the way the body regulates the heart. Left to its own devices, the heart will chug along at 100 beats per minute or so. That default rate is nudged up or down by the opposing halves of the autonomic nervous system (ANS), which acts unconsciously to regulate things like body temperature, breathing and digestion.
One half—the sympathetic nervous system, often known as the “fight-or-flight” system—revs up the heart in response to things like exercise or fear or excitement.
Its control is mostly exerted through hormones in the blood and neurotransmitters in the brain. That makes it a blunt instrument, and as heart rate rises the time between beats becomes steadier.
The other half of the ANS—the parasympathetic, or “rest-and-digest” system—slows the heart down when it is time to relax. It communicates with electrical signals sent via the vagus nerve. That allows very precise control from moment to moment, which makes the time between heartbeats more variable. (Your heart rate speeds up slightly when you breathe in, for instance, and slows down as you breathe out.)
All else being equal, stress on the body boosts the sympathetic nervous system, and thus decreases HRV. All sorts of stress count, whether psychological or physical. A hard workout, for example, will cause HRV to fall for hours (or sometimes days) as your system recovers. So will lack of sleep, the common cold, a failing marriage or worries about money.
At a population level, higher HRV is a sign of an ANS that is in good nick, and a body that can adapt itself to the stresses of life. It is associated with a lower risk of heart attacks, and a higher chance of survival if you do have one. (It was in cardiology wards that HRV first proved its usefulness.) It is also associated with slower progression of dementia, less inflammation, a lower chance of depression, and more.
Most people will more interested in what HRV can tell them about their personal lives. The best way to think of it is as an “accumulated stress” score. For sporty types a low HRV may be a signal that the body is struggling with too much training, and a hint to go easier in the gym for a while. But the numbers need careful interpretation. A big day out on the bike will cause a low HRV in the morning. But so will beers at the pub afterwards (alcohol suppresses HRV), or the unexpected tax bill waiting at home.
Those nerdy enough to track HRV may therefore want to keep a journal to refer to alongside the charts. Knowing what the numbers are telling you, after all, is the difference between mere data and its much more valuable cousin—useful information. ■
I think they’re talking heart rate changes vs. Afib...when I begin any exertion, my heart rate raises dramatically - then settles in as my body and system fall into a rhythm.
Can you go back to any of those you hurt and repent? Apologize and try to make amends.
We are also to turn from our old, sinful ways.
Saying we accept Christ is not permission to go sin. Paul tells us this.
Please work through these, as you can.
Interesting, but sounds like they still don’t really know enough.
Wearing the watch produces numbers that induce stress.
Wearing the watch is thus detrimental to one’s health
Righteo, in fine fettle today!
Baloney. Spouse is a nonagenarian; has had irregular heartbeats for years and years. We can’t generally predict when we will die. Enjoy each day and each other while we can.
Careful with alcohol and seed oils. Both will dramatically hammer HRV.
I remember a few years ago, a guy at my gym, recovering from a heart attack, told me his cardiologist said if your heart rate remains high after exercise, and does not return to normal levels, that is an indication of a pending heart attack.
I Avoid both...evidently hypothyroid/Hashimotos people have HRV issues
Make peace with God by accepting the peace he extends to you in grace, knowing all your sin; knowing that your human failings are inevitable. I have found that it’s not so much a matter of Getting Right With God (when in fact we can never be ‘good enough’), it’s more a matter of Waking Up To The Reality of God’s Grace. Accept the gift of The Gospel, hold it close in your heart, and you will be with Jesus in Heaven. Also, you are hardly alone! Many, many of us have to come to the realization that “Oh No. I’ve been doing this all wrong!” And then found JC right there to pick us up and keep us going, as if he was waiting all along.
Amen. I do my best but I’m sure I fail. It’s a tough slog being a good person. But I do my best. I’m blessed for sure. But doubt my soul is redeemable.
The great horror of most older people is not that they’ll die but rather that science will keep them alive in the way you see old people drooling in wheel chairs in nursing homes. Better to stay healthy as long as you can and then keel over and die rather than add an extra 10 years as an invalid.
How about doing well until mid 90s and then just don’t wake up someday?
Amen. I would much rather end my days in some instant and painless way. Car crash. Airplane crash. Falling off a cliff. My auntie died of pancreatic cancer nd it was horrible. She was the only one in the whole family who ever got that horrible affliction. I sure don’t want it.
Longevity is a false choice. You only get to do 89 twice. You don’t get another 42 or 19. I’ve seen what 89 looks like and frankly I don’t want to do it twice.
Everyone wants that. Get in line.
Same here…could also be whatever is measuring it..,
He knows we are wretched and broken. He loves us any way. He came to save us.
I love going to church at FreeRepublic.
I have an Oura ring and the cardiac sections measures and shows you Heart Rate variability. Very accurate, helpful little gadget.
I had to research what it was. My 1st daughter is a ICU-RN and explained it.😎
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