Resonance Breathing: How to Do It and What the Research Shows

Resonance breathing is the core of HRV biofeedback, a method developed by researchers including Paul Lehrer and Evgeny Vaschillo and studied in clinical trials for more than twenty years. The basic practice takes just a few minutes and a simple pacer to align your breath with.

This short guide covers what it is, how to do it well, what the research actually shows, and why it is worth establishing your own "resonance frequency," your optimal breathing rate for HRV biofeedback.

What is resonance breathing?

Your heart doesn't beat like a metronome. It speeds up a little every time you breathe in and slows down every time you breathe out. At normal breathing speeds these swings are small. Slow your breathing down to around six breaths a minute and they grow significantly.

The reason is resonance. Your body has a built-in blood pressure reflex (the baroreflex) that runs on a rhythm of about ten seconds. When your breathing matches that rhythm, the breath and the reflex push in the same direction, like pushing a swing at exactly the right moment, and the heart's oscillations become as large as they can get (Lehrer & Gevirtz 2014). The breathing rate where this happens is your resonance frequency. On average it is about 5.5 to 6 breaths per minute, and it is lower in taller people and in men.

A few names you'll come across describe the same family of practices:

• HRV biofeedback is resonance breathing with a live display of your heart rate, so you can see the swing and learn to make it bigger.
• Coherent breathing and "six breaths a minute" usually mean slow breathing at one fixed rate for everyone, rather than at your personal resonance rate.
• Heart rate variability (HRV) is the natural beat-to-beat variation of your heart rate, the thing this practice trains.

For the physiology in more depth, see How the Breath Controls the Heart.

How to do resonance breathing

1. Sit upright and comfortable. Feet on the floor, shoulders relaxed. Lying down works too once you're used to it.
2. Follow a steady pace. Start at six breaths per minute, i.e. ten seconds per breath cycle. A pacer helps a lot with this.
3. Breathe light, not deep. This is a part many people miss. Slowing down tempts you to take bigger breaths, and bigger breaths blow off too much carbon dioxide, which causes lightheadedness and tingling. In a trial of 46 people breathing at six breaths a minute, a simple instruction to avoid excessively deep breaths and breathe "shallowly and naturally" cut the drop in carbon dioxide roughly in half and reduced those symptoms with it (Szulczewski 2019).
4. Breathe in through your nose, into your belly, and let the exhale go softly. This is the standard technique in HRV biofeedback training (Lehrer et al. 2000).
5. Let the exhale be a little longer than the inhale. Most protocols do this, and a longer exhale felt more relaxing than a longer inhale in a study of 30 people (Van Diest et al. 2014).
6. Keep going for ten minutes.

If you feel dizzy, breathe more lightly, or simply return to normal breathing for a moment. It gets easier quickly: in a small study of daily practice, six of sixteen people over-breathed in their first session and only one still did by day seven (Szulczewski 2019).

How long and how often should you practise?

Ten minutes a day is a solid default. The original training manual for HRV biofeedback asks for twenty minutes twice a day (Lehrer et al. 2000), and if you have the time, go for it. But a longer session doesn't necessarily do more per minute: in a study of 59 people, five, ten, fifteen and twenty minute sessions all raised HRV by the same amount while breathing (You et al. 2021). But the study did show that longer sessions mean the effect carries longer into your day after the practise finishes.

If you have to choose, choose regular over long. Just like with going to the gym, doing shorter sessions but doing them regularly is better than doing long sessions but only very sporadically. It's all about the habit and the practice, so start small and build up to the practice you think you can commit to and sustain over time.

Does resonance breathing work?

For stress, anxiety and mood, the evidence is consistent and the effects are clear:

• A meta-analysis of 24 studies found large reductions in self-reported stress and anxiety (Goessl et al. 2017).
• A larger meta-analysis of 58 randomised trials found small to moderate (but statistically significant) effects across a wide range of outcomes, largest for anxiety, depression, anger, and athletic and artistic performance (Lehrer et al. 2020).
• A meta-analysis of 14 randomised trials found a reduction in depressive symptoms of small to moderate size (Pizzoli et al. 2021).

The honest caveats: most of these studies are small, and the evidence for sleep and PTSD is weaker than for stress and anxiety. Ultimately resonance breathing is a wellbeing and performance practice, not a treatment for any medical condition. But it can help manage the symptoms of various conditions, and improve overall wellbeing and performance.

From our own data. Yudemon asks people how they feel right before and right after a session (Bad, Not great, Okay, Good or Great). Across 1,625 sessions from 114 people between July and October 2026, the share feeling Good or Great went from 33% before a session to 51% after. About two in three people felt better on average across their sessions, and only about one in twenty felt worse. When people started a session feeling Bad or Not great, 63% of those sessions ended at Okay or better.

These are self-reports from people who chose to practise, with no comparison group, so expectations play a part.

How soon will you notice a difference?

Often in the first session: a calmer state right afterwards is the most common experience, and it's what our check-in data shows.

Lasting changes take a few weeks of practice. Trials usually measure after about four weeks, and by then stress and anxiety scores have typically improved (Sumińska et al. 2026). Resting HRV, the number many smartwatches or fitness trackers like the Oura Ring show each morning, is less predictable: several four-week trials found no change, others did, and it varies a lot between people. Treat any change there as a bonus, not the goal, and definitely don't be discouraged if your resting HRV doesn't change. It does not mean the practice isn't working.

Like any training, it works while you keep doing it. Few trials have followed people up afterwards: some found benefits still there three to six months later (Lin et al. 2012; Dolgilevica et al. 2025), and one found the advantage had faded by twelve months (Tatschl et al. 2020).

Why find your own breathing rate?

Six breaths per minute is the number you'll see quoted everywhere, and it's a good place to start. But resonance is personal. Your rate depends on your body (taller people and men tend to have lower rates), and practice doesn't shift it much (Lehrer & Gevirtz 2014). It's really a property of your unique physiology.

From our own data. Among 79 people with ten or more Journey sessions in Yudemon, the median resonance rate was about 5.8 breaths per minute, and between a quarter and a third sat at least half a breath per minute away from six, mostly below it.

Why it matters. At your resonance rate the heart's response to each breath is at its largest, and it falls off quickly on either side. In my own ten-day self-study, breathing at 6.5 breaths per minute instead of my optimal rate of 5.4 roughly halved the HRV response, and being just 0.2 breaths per minute off still cost more than 10% (Finding My Resonance Frequency). In a trial of 95 students, fifteen minutes at each person's own resonance rate lifted mood more than the same session one breath per minute faster (Steffen et al. 2017). Breathing at six still works well: in a 2026 trial, four weeks at either an individual rate or a fixed six reduced stress, and the study couldn't separate the two (Sumińska et al. 2026). So start at six today, and refine as you go.

Why it's hard to measure. The standard method is a single scan: a few minutes at each rate, stepping down from about 6.5 to 4.5 breaths per minute, then picking the best one. Two things make that fragile:

• Your measured rate moves. When researchers re-measured people a week later, the best rate had changed in two out of three (Capdevila et al. 2021).
• Order matters more than expected. In our own analysis of 2,636 sessions, HRV in the first two minutes of a session came in about 24% higher than in the last two, whatever the rate. A scan that always runs in the same order hands that advantage to the same rate every time (The First Two Minutes).

That's why Yudemon's Journey doesn't rely on one scan. Every Journey session is a full ten-minute resonance breathing session that tests a small range of rates in random order, corrects for the first-minutes effect, and refines your estimate session by session. The practice itself is the measurement. (How Journey works.)

To be fair, not every study finds that the exact breathing rate makes a meaningful difference to how people feel over a few weeks of practice (Fincham et al. 2023). Whatever your rate, the most important thing is to keep practising.

Do you need a heart rate monitor?

No. The breathing does the work: in a trial of 112 people, slow breathing produced the same HRV with and without a live heart rate display, and people rated their mood slightly more positive with it (Laborde et al. 2022). A pacer and ten quiet minutes are enough to start.

A chest strap adds two things. You can see the swing, which makes it much easier to learn what good technique feels like. And you can measure your own resonance rate, which needs beat-to-beat data. Chest straps measure the heart's electrical signal directly and are what accurate HRV needs: about seven in ten Yudemon users practise with a Polar H10. Most watches can't stream beat-to-beat data to other apps (Apple Watch doesn't at all), and optical wrist sensors are less accurate for this.

Resonance breathing vs box breathing

Box breathing (in, hold, out, hold, often four seconds each) is a quick calming technique, popular in the military and with athletes. At four-second counts it works out to under four breaths a minute, broken up by holds. In a month-long study of five minutes a day, box breathing, cyclic sighing and mindfulness meditation all reduced anxiety, and cyclic sighing gave the largest lift in mood (Balban et al. 2023).

Resonance breathing is continuous, with no holds, and paced to your heart's own rhythm so each breath amplifies the swing. It's the technique behind more than two decades of HRV biofeedback research. They're different tools, and you can practise both. Yudemon supports breath holds for box breathing too; you can enable and customise them in the settings.

Is resonance breathing safe?

For most people, yes. The only small potential side effect is lightheadedness if you are over-breathing, which goes away when you breathe more lightly or return to normal breathing. Practise sitting or lying down, never while driving or in water. If you have a heart or lung condition, are pregnant, or have any medical concerns, check with your doctor before starting. Once again, resonance breathing supports wellbeing and helps you feel and perform better. It doesn't replace medical treatment.

A structured way to start: Foundations

Knowing the technique is one thing. Building a practice is another. Foundations is Yudemon's guided program for exactly that: eighteen sessions in six short phases, one new step a day (but you can pause in between; the program will wait for you).

Each step is an ordinary resonance breathing session with one thing to focus on: getting the technique right, understanding your body's feedback, making the practice a fixed part of your day, and taking it into the moments that matter. Each step also comes with an optional science note, written to the same standard as this guide.

• The first phase is free to try for everyone.
• It works with or without a heart rate strap.
• With a strap, you can run any step as a Journey session, so you find your resonance rate while you learn the practice.

Learn more about the Yudemon app

How Yudemon compares to other HRV apps

As of October 2026. You don't need special equipment to start: any steady pacer or breathing timer will do. If you want guidance or biofeedback, these are the main options and how they differ:

• Elite HRV is a free app with a ten-week program based on Leah Lagos's book Heart Breath Mind. It does not offer a way to measure your own resonance frequency, and its iOS app was last updated in November 2023.
• HeartMath Inner Balance requires HeartMath's own ear-clip sensor, sold together with the app for $249, and includes short multi-day programs built around a state HeartMath calls "coherence".
• HRV4Biofeedback measures your resonance frequency with a single six-minute scan, stepping from 7.5 down to 5 breaths per minute in half-breath steps: the single-scan method described above.
• Optimal HRV combines a resonance test, biofeedback and mindfulness content on a subscription, with its own heart rate monitor, and has no guided program.
• Yudemon measures your resonance frequency across many sessions and on a continuous scale rather than in one scan with coarse steps, guides you through the practice with Foundations, and works with any standard Bluetooth chest strap or with no sensor at all. Breathing sessions are free and unlimited.

How this guide was made

Every study cited here was checked against the original paper, and the numbers are the ones the authors report. Where a finding is limited, the text says so. The Yudemon figures come from anonymised session data of people who sync their practice to an account, excluding anyone who has opted out of research.

Yudemon makes a resonance breathing app, so we have an interest in this topic. We've written this guide to be useful whether or not you ever use our app.

About the author. Max Frenzel holds a PhD in quantum information theory from Imperial College London and worked as a postdoctoral researcher at the University of Tokyo before moving into AI research and product design. He built Yudemon after using resonance breathing to manage his own wellbeing and performance, and has published original research on HRV biofeedback. He is also the author of the international bestseller Time Off: A Practical Guide to Building Your Rest Ethic and Finding Success Without the Stress, and is the Chief Technology and Product Officer at Track Titan, an AI coaching tool for racing drivers.

Last reviewed: 10 October 2026.

References

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