Vagus Nerve Exercises: What Actually Helps, and What the Evidence Doesn't Support

By Levi G. Wilder. I'm a researcher and trauma survivor, not a therapist or a doctor. This article is education, not medical advice. If you have heart, breathing or digestive symptoms, or you're struggling with anxiety or panic, please speak to a health professional.

Search for "vagus nerve exercises" and you'll find everything from humming to ice baths to devices that clip onto your ear, often with big promises attached. Some of these practices have decent research behind them. Others don't. This guide sorts through what's known, in plain language, so you can spend your time on the habits most likely to help.

What the vagus nerve does

The vagus nerve is the longest of the cranial nerves. It links the brain with the heart, lungs and gut, and carries signals in both directions (Breit et al., 2018). It's a major part of the parasympathetic nervous system, the "rest and digest" side that helps your body settle after stress.

You can feel one of its jobs right now. As you breathe in, your heart rate tends to rise slightly. As you breathe out, it tends to fall. This rhythm is called respiratory sinus arrhythmia, and it reflects vagal influence on the heart (Grossman & Taylor, 2007). It's the main reason slow breathing with longer exhales comes up again and again.

A quick word on heart rate variability (HRV)

HRV is the natural variation in time between heartbeats. Some HRV measures are used as a rough, indirect marker of vagal activity on the heart (Shaffer & Ginsberg, 2017). On average, people with anxiety disorders have lower HRV than people without them (Chalmers et al., 2014).

HRV is useful, but it's a noisy signal. Breathing rate, posture, fitness, age, alcohol, sleep and medication all change it. So treat a wearable's HRV number as a loose trend over weeks, not as a daily score for your nervous system.

The exercises with the best evidence

1. Slow breathing (about five to six breaths a minute)

This is the strongest-supported practice. A meta-analysis of slow breathing studies found that breathing slowly increased vagally related HRV during the practice (Laborde et al., 2022). A systematic review linked slow breathing with relaxation and lower anxiety, though many of the studies were small (Zaccaro et al., 2018).

When people breathe at around five to six breaths a minute, the rise and fall in heart rate with each breath becomes much larger. This is called resonance breathing, and it's the basis of HRV biofeedback. Meta-analyses of HRV biofeedback report reductions in self-reported stress and anxiety (Goessl et al., 2017; Lehrer et al., 2020).

How to try it: sit comfortably. Breathe in gently through your nose for about four seconds, then out for about six. That's six breaths a minute. Keep it soft, not forced. Start with three to five minutes. If you feel light-headed, return to normal breathing.

2. Long exhales and "cyclic sighing"

In a one-month remote study, a daily five-minute practice of exhale-focused breathing, called cyclic sighing (a double inhale through the nose, then a long, slow exhale), improved mood more than mindfulness meditation did (Balban et al., 2023). It's one study, but it's a simple, low-risk practice to try when you feel wound up.

3. Regular movement

Exercise training is associated with improvements in HRV (Routledge et al., 2010). You don't need anything extreme: regular walking, cycling, swimming or similar activity you enjoy counts. Gentle yoga, which combines movement with slow breathing, has been proposed as a way to support the stress system (Streeter et al., 2012), and in one randomized trial it reduced PTSD symptoms when added to ongoing treatment (van der Kolk et al., 2014).

4. Sleep

Poor sleep is linked with higher markers of inflammation (Irwin et al., 2016), and the vagus nerve is involved in the body's inflammation-calming reflex (Tracey, 2002). A steady sleep and wake time, morning light and a wind-down routine are some of the least glamorous but most useful "vagus nerve" habits there are.

5. Connection

Strong social relationships are associated with lower mortality risk, on a scale comparable to well-known health risks (Holt-Lunstad et al., 2010). That doesn't prove the effect runs through the vagus nerve, but feeling safe with other people is part of how humans settle after stress. A call with a friend can be as much a regulation tool as a breathing exercise.

6. Humming and singing

Singing naturally slows and lengthens the exhale. One small study found that singers' heart rates followed the structure of the song, with slow, regular singing producing a breathing-linked heart rhythm (Vickhoff et al., 2013). Treat this as a pleasant way to practise slow exhaling rather than a special vagal trick.

What the evidence doesn't support (yet)

• Cold plunges as a cure. Splashing cold water on your face can trigger a reflex that slows the heart, and some people find it calming in the moment. But the idea that cold showers treat depression comes mainly from a hypothesis paper, not a trial (Shevchuk, 2008). Cold exposure can be risky if you have a heart condition.
• Ear-clip and other consumer stimulators. Transcutaneous vagus nerve stimulation is an active research area, but studies vary widely in method, and researchers have called for better reporting standards (Farmer et al., 2021). Implanted vagus nerve stimulation is a medical treatment for specific conditions under specialist care. It isn't the same thing as a wellness gadget.
• "Polyvagal" as settled science. Polyvagal theory is a popular map for talking about safety and threat (Porges, 2022). Several of its core physiological claims are disputed (Grossman, 2023; Neuhuber & Berthoud, 2022). It can still be a useful language, but be wary of anyone selling it as proven fact.
• Quick fixes for trauma or anxiety disorders. Breathing and lifestyle habits can help you feel steadier, but they don't replace evidence-based treatment. For PTSD, for example, guidelines recommend trauma-focused psychological therapies (National Institute for Health and Care Excellence, 2018).

A simple five-minute routine

1. Sit or lie down and let your shoulders drop.
2. Take two or three normal breaths and notice where you feel them.
3. Breathe in for about four seconds and out for about six, for three minutes.
4. Finish with three cyclic sighs: two short inhales through the nose, then a long, slow exhale through the mouth.
5. Notice one thing you can see and one thing you can hear before you get up.

Do it once or twice a day for a couple of weeks before judging whether it helps. If any practice makes you feel worse, panicky or dizzy, stop and go back to normal breathing.

When to see a doctor

See a health professional if you have fainting, a very slow, fast or irregular heartbeat, chest pain, trouble swallowing, ongoing digestive symptoms, or anxiety that is getting in the way of daily life. If you are in crisis, contact your local emergency number.

The new second edition of The Vagus Nerve Reset Workbook turns these exercises into a 30-day program (coming soon). If anxiety in relationships is part of what you're calming, this 10-minute reset for anxious attachment thoughts pairs well with slow breathing.

Go deeper

I turned this research into a gentle 30-day program: The Vagus Nerve Reset Workbook, Second Edition (previously published as The Vagus Nerve Healing Bible). It covers breathing, movement, sleep, rhythm and connection, with honest chapters on polyvagal theory, HRV and vagus "hacks". The new edition is coming soon to Google Play and major ebook stores. In the meantime, the 5-minute reset card and the printable companion workbook are a free download (PDF).

Sources

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• Breit, S., Kupferberg, A., Rogler, G., & Hasler, G. (2018). Vagus nerve as modulator of the brain–gut axis in psychiatric and inflammatory disorders. Frontiers in Psychiatry, 9, 44. https://doi.org/10.3389/fpsyt.2018.00044
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