What Is a Good HRV? The Complete Guide by Age (And How to Improve Yours)

There is no universal "good" HRV. Heart rate variability varies enormously between individuals (a healthy adult might sit anywhere from around 20ms to over 100ms) and the number is influenced by age, genetics, fitness, measurement method and which device you wear. 

The only comparison that means anything is you against your own baseline, tracked as a rolling 7-day average. A rising trend suggests improving autonomic recovery. A falling trend suggests accumulating stress or fatigue.

This guide covers what HRV actually measures, typical ranges by age, what a low reading is telling you, and the seven things that reliably move it.

What is HRV?

 

Heart rate variability is the variation in time between consecutive heartbeats, measured in milliseconds. If your heart rate is 60 beats per minute, your heart is not beating exactly once per second, the gaps fluctuate slightly, and HRV quantifies that fluctuation.

Counterintuitively, more variation is generally better. It reflects a responsive autonomic nervous system able to shift smoothly between the sympathetic ("fight or flight") and parasympathetic ("rest and digest") branches. A metronome-like heart rhythm usually indicates the system is stuck in a stressed state.

Most consumer wearables report rMSSD, the root mean square of successive differences, typically measured overnight during sleep, when external influences are lowest.

What is a good HRV by age?

 

HRV declines with age in most people. The table below shows broadly typical ranges reported for overnight rMSSD in adults. Treat these as orientation only, individual variation within any age band is far larger than the difference between bands.

 

 

Two things to hold onto:

• A well-trained 55-year-old can have a higher HRV than a sedentary 30-year-old. Age sets a rough gradient, not a ceiling.
• Devices are not interchangeable. Whoop, Oura and Garmin use different sensors, sampling windows and algorithms. Comparing your Oura number to a friend's Whoop number is meaningless. Comparing your Oura number to your own Oura number last month is the whole point.

What does a low HRV mean?

 

A low HRV (relative to your own baseline) generally indicates that your body is under load and prioritising the stress response over recovery. A single low day is normal and not worth reacting to. A sustained downward trend over a week or more is worth investigating.

The common drivers, roughly in order of how often they explain it:

• Poor or short sleep - the single biggest lever for most people
• Alcohol - one of the most visible and immediate suppressors in wearable data
• Training load - a hard session should lower HRV the following night; that is adaptation, not a problem, unless it persists
• Psychological stress - work pressure and poor sleep compound each otherIllness - HRV often drops one to two days before symptoms appear
• Dehydration and late eating - both commonly suppress overnight readings
• Cellular and metabolic strain - recovery is an energy-dependent process at cell level

If your HRV has been trending down for weeks and you also feel persistently exhausted, that combination is worth taking seriously, here's what else might be going on.

How to improve your HRV: seven things that work

1. Protect your sleep first

 

Consistent sleep and wake times matter more than total hours for HRV. A regular schedule stabilises circadian rhythm, and circadian rhythm heavily influences overnight autonomic tone. If you change one thing, change this.

2. Cut alcohol, especially close to bed

 

Alcohol is one of the most reliably visible HRV suppressors in consumer wearable data, and the effect often persists into a second night. Two alcohol-free weeks will usually show up clearly in your rolling average.

3. Train - but periodise

 

Aerobic fitness raises HRV over months. Chronic overreaching lowers it. The pattern to look for is a dip after hard sessions followed by a rebound above baseline. If the rebound stops arriving, you are accumulating fatigue faster than you are clearing it.

4. Use slow breathing

 

Five to ten minutes of slow, extended-exhale breathing (roughly six breaths per minute) increases parasympathetic activity and, practised consistently, is associated with improved HRV over time.

5. Time your last meal earlier

 

Digestion during sleep raises heart rate and suppresses HRV. Finishing your last substantial meal two to three hours before bed is one of the easier wins to test, since the change usually appears within days.

6. Manage psychological load deliberately

 

Chronic stress keeps the sympathetic branch dominant. Whatever downregulates it for you (walking, cold exposure, meditation, actually finishing work at a set time) shows up in the data if you do it consistently.

7. Support recovery at cellular level

 

Recovery is not passive. It is an active, energy-dependent process, and the energy comes from your mitochondria. NAD+ is central to that energy production, and levels decline with age and are further consumed by training, poor sleep and inflammation.

This is why some people track HRV alongside a daily cellular protocol, the metric is measuring the same recovery systems the protocol is designed to support. Here's the mechanism in full.

How to track HRV properly

 

Most people misread their own data. Four rules:

1. Use rolling 7-day averages, never single days. Night-to-night variation is large enough to hide any real trend.
2. Establish a 14-day baseline before changing anything, so you have something to compare against.
3. Change one variable at a time. Starting a supplement, a new training block and a sleep schedule in the same week tells you nothing.
4. Give it 60 to 90 days. HRV baselines move slowly. Anything shorter is noise.

 

This is exactly the protocol we recommend for anyone testing whether a supplement is doing anything, most people who conclude "it didn't work" never measured it.

Frequently asked questions

What is a good HRV for my age?

 

Typical overnight rMSSD values range from roughly 55-105ms in your twenties down to around 25-50ms over 60, but individual variation within each band is very large. Your own baseline and its trend direction are far more informative than any population average.

Is a HRV of 30 bad?

 

Not necessarily. For someone over 50, 30ms may sit comfortably within a normal range. For a 25-year-old endurance athlete whose baseline is 80ms, a reading of 30 would suggest significant acute stress or fatigue. Context and trend are everything.

How quickly can you improve HRV?

 

Acute factors (alcohol, a late meal, a poor night's sleep) show up within a day or two. Genuine baseline improvement from training, sleep consistency or recovery support typically takes 60 to 90 days to appear clearly in a rolling average.

Why is my HRV suddenly low?

 

The most common causes are alcohol, short or disrupted sleep, a hard training session, acute stress, or illness, HRV often drops a day or two before symptoms appear. A single low reading is normal; a sustained multi-week decline is worth investigating.

Does HRV measure recovery?

 

HRV is one of the most validated non-invasive markers of autonomic recovery, which is why Whoop, Oura and Garmin all weight it heavily in their recovery and readiness scores. It reflects nervous system state rather than muscular recovery specifically.

When should I see a doctor about my HRV?

 

Wearable HRV is a wellness metric, not a diagnostic tool. If a sustained drop comes with symptoms, persistent breathlessness, chest pain, palpitations, dizziness, or exhaustion that does not improve with rest, speak to your GP rather than trying to interpret the number yourself.

The bottom line

 

Stop asking whether your HRV is good and start asking which way it is going. Establish a baseline, change one thing at a time, read rolling averages, and give it ninety days.

If you want to support the recovery systems your wearable is already measuring, see how MUTO's NAD⁺ Cellular Complex works, built specifically to show up in your data over 90 days.

This article is for information only and is not medical advice. Wearable HRV readings are wellness estimates, not diagnostic measurements. If you have concerns about your heart rate, rhythm or persistent fatigue, speak to your GP.