Name: Pulsetto vagus nerve stimulation device.
Brand: Pulsetto
SKU: Pulsettodevice
Price: 269.0 USD
Availability: InStock

How is heart rate variability measured?

Heart rate variability is measured by recording the timing of consecutive heartbeats and then applying statistical or frequency-based analysis to those intervals. The gold-standard signal comes from an electrocardiogram (ECG), which reads the heart's electrical activity directly. Most consumer devices instead use photoplethysmography (PPG), an optical method that detects blood-volume changes through the skin using green or infrared light on the wrist or finger. PPG is less precise than ECG for beat detection but accurate enough for tracking trends day to day.

HRV is reported through several metrics, and the same recording can be described in more than one way [2].

Time-domain metrics

These come straight from the intervals between beats:

RMSSD (root mean square of successive differences) is the most widely used consumer metric. It reflects short-term, beat-to-beat changes and closely tracks vagal (parasympathetic) activity. Most wearables that show a single overnight HRV number are reporting something close to RMSSD.
SDNN (standard deviation of NN intervals) captures overall variability across a recording. It reflects both branches of the autonomic system and is often used in longer clinical recordings.
pNN50 measures the percentage of consecutive intervals that differ by more than 50 milliseconds, another marker weighted toward parasympathetic activity.

Frequency-domain metrics

These break the signal into rhythmic components:

High frequency (HF) power is strongly tied to parasympathetic, vagal activity and breathing.
Low frequency (LF) power reflects a mix of sympathetic and parasympathetic influence.
The LF/HF ratio is sometimes used as a rough index of autonomic balance, though researchers caution against over-interpreting it.

You do not need to master all of these to use HRV. The single most useful habit is consistency: measure the same way, at the same time, and compare your readings to your own baseline rather than to anyone else's. Overnight and early-morning measurements taken lying down are the most stable, which is why sleep-tracking devices give more reliable trends than a quick daytime spot-check [2]. Research also shows that HRV from low-cost wearables can classify sleep stages with useful accuracy, part of why so many recovery scores are built on overnight HRV [3].

Why HRV matters: a window into stress, recovery, and resilience

HRV matters because it offers a quiet, objective signal of how your body is coping, one that often shifts before you consciously notice you are run down. As a wellness and fitness marker, it reflects the balance between the demands placed on you and your capacity to recover from them. It is a marker of autonomic balance, not a diagnosis of disease.

HRV and the stress response

The link between HRV and stress is one of the most consistent findings in the field. A large meta-analysis of the research concluded that lower HRV is reliably associated with higher stress, reduced ability to regulate emotions, and a nervous system tilted toward the sympathetic accelerator rather than the parasympathetic brake [1]. When you are under sustained pressure, poorly rested, or emotionally strained, your HRV tends to fall. When you recover well, it tends to rise.

That is what makes HRV useful for everyday self-awareness. A single low reading means little on its own, but a run of lower-than-usual mornings can be an early nudge that your load has outpaced your recovery, prompting you to protect sleep, ease training, or slow down before you feel obviously depleted.

HRV is best understood as a trend, not a verdict. A single number on a given morning is shaped by your sleep, your last meal, alcohol, even the position you were lying in. What tells you something is the pattern over weeks. When your baseline HRV drifts upward as you sleep better and manage stress, that shift reflects a nervous system settling into better balance, which is exactly the kind of general wellness change these habits are meant to support.

HRV, fitness, and recovery

In fitness, HRV has become a core recovery signal. Endurance athletes tend to show higher resting HRV than sedentary peers, and a well-recovered athlete usually wakes with an HRV near or above their personal baseline. This is why platforms such as WHOOP, Oura, and Garmin fold HRV into daily readiness or recovery scores. A suppressed morning HRV after hard training suggests the body is still repairing and may benefit from a lighter day, while a rebound toward baseline signals readiness to push again. Used this way, HRV helps people train with their physiology rather than against it.

HRV and resilience

Because HRV reflects how flexibly your nervous system moves between stress and calm, it is often described as a marker of physiological resilience. A higher, more adaptable HRV suggests you can mount a response when you need one and return to baseline afterward. To be clear about scope, HRV here is a wellness and fitness marker, not a standalone medical test. It describes autonomic balance and recovery capacity, and it is most useful tracked over time alongside how you actually feel.

Try Pulsetto. Pulsetto's free app tracks your HRV and sleep alongside guided four-minute sessions and breathing exercises, so you can watch your own trend over time. Explore the Pulsetto device.

What affects your HRV?

HRV is influenced by dozens of factors, some fixed and some firmly within your control. Understanding which is which helps you read your own numbers without alarm and focus on what you can actually change.

Factors largely outside your control

Age. HRV tends to decline gradually with age as autonomic flexibility decreases. This is normal, and it is why comparing your HRV to your own past readings matters more than comparing to a younger person.
Genetics and individual baseline. Some people simply run higher or lower than others. Two healthy people can have very different HRV values, which is why absolute numbers are far less meaningful than personal trends.
Sex and hormonal cycles. Averages differ modestly between men and women, and hormonal shifts across the menstrual cycle can move HRV as well.

Factors within your control

Sleep. Short or fragmented sleep is one of the fastest ways to suppress HRV. Deep, consolidated sleep is when parasympathetic activity dominates and HRV climbs.
Alcohol. Alcohol is a notably reliable HRV suppressor. Many people who track HRV can see a clear dip on the mornings after drinking, sometimes lasting into a second night.
Psychological stress. Work pressure, worry, and emotional strain shift the balance toward the sympathetic side and lower HRV [1].
Physical training load. Exercise raises HRV over the long term, but a very hard session or accumulated overtraining can temporarily suppress it while the body recovers.
Hydration, nutrition, and meal timing. Dehydration and eating a large meal close to a measurement can both nudge readings.
Breathing patterns. Fast, shallow, chest-based breathing lowers HRV in the moment. Slow, diaphragmatic breathing raises it, which is the basis of several techniques below.

The takeaway is encouraging. Most of the biggest levers on your HRV, sleep, alcohol, stress, breathing, and training, are habits you can adjust.

How to improve (increase) your HRV

Yes, HRV can be improved. It is not a fixed trait. Because HRV reflects autonomic balance, the same lifestyle habits that support your nervous system tend to raise your HRV over weeks and months. Here are the approaches with the strongest evidence behind them, organized so you can start with whichever fits your life.

1. Exercise and cardio

Regular aerobic exercise is one of the most dependable ways to increase HRV over time. Endurance-style cardio, brisk walking, running, cycling, swimming, and rowing, gradually strengthens parasympathetic tone and is associated with higher resting HRV in trained individuals compared with sedentary ones. Both steady moderate cardio and well-managed higher-intensity work can help, provided you recover between sessions.

The nuance is dose. A single hard workout can lower your HRV the next morning because your body is still repairing, and that acute dip is normal. The upward shift comes from consistent training across weeks, not from any one session. If your HRV stays suppressed for many days in a row, that can signal under-recovery and a need for easy days. Tracking tools help: consumer wearables have been shown to increase physical activity participation, which makes it easier to build the consistent routine that lifts HRV [4]. Aim for regular aerobic activity across the week, mix intensities, and let your HRV trend, not any single reading, guide how hard you push.

2. Sleep

Sleep may be the single highest-leverage HRV habit. Parasympathetic activity peaks during deep sleep, so protecting sleep quantity and quality directly supports the vagal tone that HRV measures. People who consistently sleep enough, on a regular schedule, tend to show higher and more stable overnight HRV.

Practical steps that support sleep and, through it, HRV:

Keep consistent sleep and wake times, including weekends.
Reduce alcohol, especially within a few hours of bed, given its strong HRV-suppressing effect.
Keep the bedroom cool, dark, and quiet.
Wind down with lower light and slower activity before bed rather than intense stimulation.

Because overnight HRV is also the most reliable window for measurement, better sleep improves both the metric and the accuracy of your tracking at the same time. For device-based options, see our roundup of the best devices for sleep.

3. Slow breathing and HRV biofeedback

Slow, controlled breathing is one of the fastest ways to influence HRV, and one of the best studied. When you breathe at roughly five to six breaths per minute, close to what researchers call the resonance frequency, heart rate rises on the inhale and falls on the exhale in a large, rhythmic swing that dramatically increases HRV in the moment. Practiced regularly, this can support a higher baseline over time.

HRV biofeedback formalizes this. You breathe slowly while watching a real-time display of your heart rhythm, learning to maximize the rise-and-fall pattern. A systematic review and meta-analysis found that HRV biofeedback training improves measures of stress, anxiety, and both emotional and physical well-being across a range of populations [5]. A separate meta-analysis focused on stress and anxiety reached the same conclusion, reporting meaningful reductions with biofeedback practice [6]. Broader work on breathwork likewise finds that structured breathing reduces stress and supports mental health [7], and controlled studies show that deep-breathing protocols measurably shift HRV [8].

Try five to ten minutes of slow breathing at about six breaths per minute, once or twice a day, often paired with a guided app. For structure, our overview of techniques to soothe your nervous system walks through several approaches.

4. Stress management

Because psychological stress reliably lowers HRV, practices that reduce stress tend to raise it. Mindfulness meditation is the most studied. A well-known systematic review and meta-analysis found that meditation programs produce moderate improvements in anxiety, depressive symptoms, and stress, which are the same states that suppress HRV [9]. Regular meditation, time in nature, social connection, and simply protecting downtime all shift the autonomic balance back toward the parasympathetic brake.

You do not need a perfect routine. Even short, consistent stress-reduction habits, a few minutes of daily practice, tend to compound. For a broader toolkit, see our guide on strategies to reset your nervous system and how to activate the parasympathetic nervous system.

5. Vagus nerve stimulation

Since the vagus nerve is the main driver of the parasympathetic influence that HRV measures, directly engaging it has become an area of active research. Vagus nerve stimulation can be pursued gently through behavior, slow breathing, humming, cold exposure, and gargling all lightly engage vagal pathways, and increasingly through non-invasive devices that deliver mild electrical stimulation to branches of the nerve.

Transcutaneous vagus nerve stimulation (tVNS), delivered either at the ear or the neck, has been studied for its effect on HRV in healthy people. Several studies report that auricular (ear) stimulation can raise vagally mediated HRV markers [10][11], and a systematic review found it can influence HRV and baroreflex sensitivity in healthy subjects [12]. Age appears to matter, with effects varying across age groups [13], and one study found that pairing stimulation with deep breathing modulates HRV as well [8].

Honesty about the evidence matters here. A living Bayesian meta-analysis by Wolf and colleagues found that, pooled across many studies, the effect of transcutaneous auricular stimulation on vagally mediated HRV is smaller and less certain than early enthusiasm suggested, and depends heavily on stimulation settings and study design [14]. In plain terms: the mechanism is real and biologically plausible, individual studies are often positive, but effects are modest, vary between people, and tend to build with consistent use rather than appearing dramatically after one session. That is the honest state of the science, and it is the frame we apply to consumer devices, including our own.

Where Pulsetto fits in

Pulsetto is a hands-free, non-invasive vagus nerve stimulator designed to support relaxation and nervous system regulation for general wellness use. It sits gently on the neck and delivers mild bilateral cervical stimulation in sessions of around four minutes, so you can use it while reading or winding down rather than holding a device to your skin. It is a general wellness device, not a medical device, and it is not a treatment for any condition.

For people interested in HRV, two things make Pulsetto relevant. First, it is built around the same vagal pathway that HRV reflects, so it is designed to support the autonomic balance that shows up in your readings. Second, the free Pulsetto app tracks your HRV and sleep alongside guided sessions and breathing exercises, so you can follow your own trend over time in one place rather than guessing.

On outcomes, we report our own data plainly and attribute it clearly. In Pulsetto's own randomized open-label pilot study (n=40, 4 weeks), participants reported a 55.9% reduction in depressive symptoms (PHQ-9), a 45.3% reduction in anxiety symptoms (GAD-7), and a 41.0% improvement in sleep quality (PSQI). Bilateral stimulation reduced the chronic-stress biomarker hair cortisol by 47.5%, compared with 31.4% for unilateral stimulation. These are early, industry-funded pilot results tied to stress, sleep, and mood measures rather than HRV endpoints, and they sit alongside the broader peer-reviewed nVNS literature rather than replacing it. We think that honest framing serves you better than overclaiming. You can read more on the science behind Pulsetto and its ongoing clinical studies and trials.

If you are weighing devices, it helps to understand the wider category. Our overviews of the best HRV device, the best vagus nerve stimulation devices, and non-invasive vagus nerve stimulation explained compare the different mechanisms, and our guide to the vagus nerve's anatomy and core functions goes deeper on the biology.

Safety and contraindications

Pulsetto is designed for general wellness use and is well tolerated by most people, but non-invasive vagus nerve stimulation is not appropriate for everyone. Do not use Pulsetto, and consult a qualified healthcare professional first, if any of the following apply to you:

You have a pacemaker.
You have any implanted electrical medical device.
You have epilepsy or a seizure disorder.
You are pregnant.
You have a cardiac arrhythmia or a serious cardiovascular condition (consult a doctor first).
You have had recent neck or throat surgery (consult a doctor first).
You have a carotid artery condition.

You can review full contraindications for using Pulsetto and more on whether Pulsetto is safe before starting.

What is a good HRV?

A good HRV is, first and foremost, one that is stable or trending upward for you. There is no single universal number that counts as good, because HRV varies so widely with age, genetics, sex, fitness, and even the device and metric used. A reading that is high for a 60-year-old could be average for a 25-year-old, and both can be perfectly healthy.

That said, a few reference points help. Overnight RMSSD in the general adult population commonly falls somewhere in the range of the low tens up to over a hundred milliseconds, and it tends to be higher in younger and fitter people. Rather than chasing a target number, watch three things: your personal baseline, your trend over weeks, and how your readings line up with how you feel and recover. For a detailed, age-based breakdown, see our full guide to what is a good heart rate variability score, with an HRV chart for age and gender. If you are working to raise your number specifically, our guide on how to increase your HRV score with exercise, diet, supplements, and sleep goes deeper on the levers.

One caution worth repeating: a low HRV is not a disease and does not diagnose one. It is a signal to look at your sleep, stress, alcohol, and recovery. If you have a consistently very low HRV alongside symptoms that concern you, that is a conversation for a qualified healthcare professional, not something to self-diagnose from a wearable.

Putting it together

Heart rate variability turned an invisible process, the constant negotiation between your body's accelerator and brake, into a number you can watch. Used well, it is a gentle, objective read on stress and recovery that can nudge you toward better habits before you feel run down. The path to a higher HRV is not exotic. Move regularly, sleep well, drink less alcohol, manage stress, breathe slowly, and support the vagal pathway that underlies the whole system. Track your own trend, be patient across weeks, and let the number serve you.

Frequently asked questions

Can you improve your HRV?

Yes. HRV is not fixed. It responds to lifestyle over weeks and months. Regular aerobic exercise, consistent quality sleep, less alcohol, effective stress management, and daily slow breathing are the best-supported ways to raise it. Because these habits shift your autonomic balance toward the parasympathetic side, they tend to lift your baseline HRV gradually. Expect a trend over time rather than an overnight jump.

How do I increase my HRV?

Focus on the highest-leverage habits first. Protect your sleep and keep a regular schedule, since deep sleep is when HRV is highest. Reduce alcohol, which reliably suppresses HRV. Build a consistent aerobic exercise routine while allowing recovery between hard sessions. Practice slow breathing at about six breaths per minute for a few minutes daily, optionally with HRV biofeedback, which research links to lower stress and anxiety [5][6]. Manage stress through mindfulness or other practices you will actually keep [9]. Supporting the vagus nerve through breathing, humming, and gentle non-invasive stimulation can help as well.

What is a good HRV?

A good HRV is one that is stable or trending upward relative to your own baseline. There is no single universal number, because HRV varies widely with age, genetics, sex, fitness, and the device used. Younger and fitter people generally show higher values, and HRV declines gradually with age. Rather than comparing yourself to others, track your personal trend over weeks.

Does exercise improve HRV?

Yes, over time. Regular aerobic and cardio training is one of the most dependable ways to raise resting HRV, and trained individuals tend to show higher HRV than sedentary peers. The key nuance is recovery: a single hard workout can temporarily lower your HRV the next morning while your body repairs, which is normal. The lasting increase comes from consistent training across weeks, balanced with easy days, not from any one intense session.

What is a normal heart rate variability?

There is no single normal number, only ranges that shift with age, sex, fitness, and measurement method. Overnight RMSSD for adults commonly spans from the low tens into the hundreds of milliseconds, running higher in younger and fitter people and declining with age. Because the spread is so wide, a value that is normal for one person may be unusual for another. Your own baseline and trend are far more meaningful than any population average.

Does alcohol lower HRV?

Yes, and often noticeably. Alcohol is one of the most reliable short-term suppressors of HRV. Many people who track HRV see a clear drop on the mornings after drinking, and the effect can linger into a second night. Reducing or timing alcohol away from bedtime is one of the quickest ways to see your HRV recover, and it improves sleep quality at the same time, which supports HRV further.

How is HRV measured?

HRV is measured by timing the intervals between consecutive heartbeats and analyzing them statistically. Clinical measurement uses an electrocardiogram (ECG); most consumer wearables use optical sensors (PPG) on the wrist or finger. Common metrics include RMSSD and pNN50 (weighted toward parasympathetic activity) and SDNN (overall variability), plus frequency-domain measures like HF and LF power. Overnight or early-morning readings taken consistently give the most reliable trends [2].

Does Pulsetto increase HRV?

Pulsetto is a general wellness device designed to support relaxation and nervous system regulation through non-invasive vagus nerve stimulation, and its free app tracks your HRV and sleep so you can follow your own trend. The broader research on transcutaneous vagus nerve stimulation suggests it can influence vagally mediated HRV markers in healthy people, though effects are modest, vary between individuals, and build with consistent use [10][11][12][14]. Pulsetto is not a medical device and is not a treatment for any condition. It is one tool alongside sleep, exercise, and breathing for supporting the autonomic balance HRV reflects.

Can HRV be too high?

For most healthy people, a higher resting HRV is generally favorable and reflects good autonomic flexibility. Very high readings paired with an unusually low or erratic heart rate can occasionally reflect other factors and are worth discussing with a healthcare professional if they concern you. For the vast majority of people using consumer wearables, the practical goal is a stable or gently rising trend, not the highest possible single number.

Scientific research

Pulsetto is a general wellness product and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. The studies below were identified through the Consensus and PubMed research databases, are indexed in PubMed, and are linked directly by DOI. They support the physiological mechanisms discussed in this article on heart rate variability and the autonomic nervous system. They are not claims about Pulsetto as a medical device.

[1] Stress and Heart Rate Variability: A Meta-Analysis and Review of the Literature (Kim et al., 2018, Psychiatry Investigation. PMID: 29486547)

[2] An Overview of Heart Rate Variability Metrics and Norms (Shaffer et al., 2017, Frontiers in Public Health. PMID: 29034226)

[3] The Virtual Sleep Lab: Accurate Four-Class Sleep Staging Using Heart-Rate Variability from Low-Cost Wearables (Topalidis et al., 2023, Sensors. PMID: 36904595)

[4] Consumer-Based Wearable Activity Trackers Increase Physical Activity Participation: Systematic Review and Meta-Analysis (Brickwood et al., 2019, JMIR mHealth and uHealth. PMID: 30977740)

[5] Heart Rate Variability Biofeedback Improves Emotional and Physical Health and Performance: A Systematic Review and Meta Analysis (Lehrer et al., 2020, Applied Psychophysiology and Biofeedback. PMID: 32385728)

[6] The effect of heart rate variability biofeedback training on stress and anxiety: a meta-analysis (Goessl et al., 2017, Psychological Medicine. PMID: 28478782)

[7] Effect of breathwork on stress and mental health: A meta-analysis of randomised-controlled trials (Fincham et al., 2023, Scientific Reports. PMID: 36624160)

[8] Modulating Heart Rate Variability through Deep Breathing Exercises and Transcutaneous Auricular Vagus Nerve Stimulation (Jensen et al., 2022, Sensors. PMID: 36298234)

[9] Meditation programs for psychological stress and well-being: a systematic review and meta-analysis (Goyal et al., 2014, JAMA Internal Medicine. PMID: 24395196)

[10] The effect of transcutaneous auricular vagus nerve stimulation on HRV in healthy young people (Geng et al., 2022, PLoS ONE. PMID: 35143576)

[11] Ear your heart: transcutaneous auricular vagus nerve stimulation on heart rate variability in healthy young participants (Forte et al., 2022, PeerJ. PMID: 36438582)

[12] A systematic review of the effects of transcutaneous auricular vagus nerve stimulation on baroreflex sensitivity and heart rate variability in healthy subjects (Soltani et al., 2023, Clinical Autonomic Research. PMID: 37119426)