You know the feeling by early evening. Your shoulders have crept toward your ears, your jaw is set, and your breath sits high in your chest even though you are only reading or washing up. Slow breathing is one of the few things you can do about that without equipment, a class or a good set of knees. Breathing exercises to calm the nervous system also come with plenty of bold claims, so this article covers what is known about the vagus nerve and the exhale, where the evidence is thin, and a gentle Qigong breath to try tonight.
If you want the standing, still side of Qigong, this article on what is happening while you stand quietly covers it. This one stays with the body’s wiring and the breath itself.
What “an overactive nervous system” really means, and what it doesn’t
“Overactive nervous system” is a popular phrase, not a medical diagnosis. People use it for a cluster of familiar sensations: a fast or noticeable heartbeat, shallow breathing, tight muscles, a mind that will not settle at bedtime.
Behind those sensations is the autonomic nervous system, which runs the things you do not decide consciously, such as heart rate, digestion and the width of your airways. It is usually described in two parts. The sympathetic branch prepares the body for effort and alarm. The parasympathetic branch is associated with rest, digestion and a slower heart rate.
It is tempting to picture these as a switch, with one side on and the other off. In reality both are active all the time and their balance shifts moment to moment. A busy day, poor sleep, caffeine, pain and worry all push that balance toward the sympathetic side. Slow breathing is one way to nudge it back, gently.
It is worth saying plainly that persistent anxiety, panic attacks, a racing heart that comes without warning, or sleep that has been poor for weeks are matters for a doctor. A breathing practice can sit alongside that care, but it does not replace it.
The vagus nerve in plain words
The vagus nerve is the tenth cranial nerve. Its name comes from the Latin for “wandering,” which suits it. It starts in the brainstem and travels down through the neck and chest, branching to the heart and lungs and on into the digestive tract. It is really a pair of nerves, one on each side of the body.
It carries messages in both directions. A large share of its fibres carry information up from the organs to the brain, such as how stretched the gut is or how the heart is beating. Others carry instructions down. The vagus is the main route by which the parasympathetic system slows the heart.
You cannot feel your vagus nerve and you cannot press on it to calm down. Pressing on the neck is not a good idea at all. What you can do is change signals that the nerve reports on and responds to, and breathing is the most accessible of them because you can control it deliberately.
Why a longer exhale is linked to a slower heart rate
In most healthy people, heart rate rises a little as you breathe in and falls a little as you breathe out. This is called respiratory sinus arrhythmia, and it reflects the vagus nerve’s influence on the heart. The inhale briefly eases that influence, and the exhale restores it.
That gives the idea behind the longer exhale. If the heart slows during the out-breath, then spending more of each breath cycle exhaling gives you more time in the slower phase. Many slow breathing studies also use a pace of about six breaths per minute, which is roughly where breathing rhythm lines up with other slow, natural swings in heart rate and blood pressure. This is part of the explanation offered by Gerritsen and Band in their 2018 paper “Breath of Life: The Respiratory Vagal Stimulation Model of Contemplative Activity” in Frontiers in Human Neuroscience, which proposes that slow, deliberate breathing in contemplative practices acts partly through the vagus.
That paper is a model, meaning a proposed explanation. It is a reasonable one, but it is not a settled finding.
What the research supports so far, and where it is still uncertain
There is some real, encouraging evidence.
- Heart rate variability. A 2022 systematic review and meta-analysis by Laborde and colleagues in Neuroscience & Biobehavioral Reviews looked at voluntary slow breathing and heart rate variability, a measure of how much the time between heartbeats fluctuates. Slow breathing was generally associated with higher heart rate variability, which is often read as a sign of stronger vagal influence on the heart. The studies varied a good deal in method.
- Self-reported calm. A 2018 review by Zaccaro and colleagues in Frontiers in Human Neuroscience gathered studies on slow breathing and found it associated with greater relaxation and comfort, and with lower anxiety, anger and arousal in many of them.
- Short daily practice. In a 2023 randomised study by Balban and colleagues in Cell Reports Medicine, 108 adults did five minutes of different breathing or meditation routines daily for a month. Participants in the breathing groups reported improved mood, and the group doing “cyclic sighing” (a double inhale through the nose followed by a long, slow exhale) improved the most.
Now the cautions. Heart rate variability is a convenient number, but how well it reflects “vagal tone” is debated among researchers. Many slow breathing studies are small, short and run in labs, and they use different breathing speeds and ratios, so they are hard to compare. Feeling calmer after ten minutes of breathing does not show that a practice will change anxiety, blood pressure or sleep over months. The Balban study measured mood and a few body signals, not clinical conditions.
Claims that breathing “resets” or “activates” your vagus nerve and cures stress, inflammation or digestive trouble go well beyond what these papers show. A fair summary is that slow breathing with a longer exhale reliably shifts heart rhythm in the moment, often feels calming, and is low-risk for most people. Beyond that, the evidence is still developing.
A five-minute Qigong breath for the evening
Qigong has long taught a slow, low breath that settles into the lower belly, which the tradition calls the dantian. In physiological terms this is diaphragmatic breathing: the belly and lower ribs expand on the inhale and soften on the exhale, rather than the shoulders lifting. The practice below uses that pattern with a slightly longer exhale.
If you would like guided Qigong breathing practice alongside this, Emei Qigong Harmony offers instruction that you can follow along with. Taijipulse is an affiliate of the program through emeiqigongharmony.com/bryce, so Taijipulse may earn a commission if you sign up. It is a way to be guided through breathing and movement. It does not promise any health outcome, and the practice below stands on its own without it.
What you need: a chair with a supportive back, or a bed or mat if lying down is more comfortable. Loose clothing helps. Five minutes. Evening works well because there is less to do afterwards.
- Settle. Sit with your feet flat and your spine tall but not stiff, or lie on your back with a pillow under your knees if your back or hips ache. Let your shoulders drop and your tongue rest softly behind your upper teeth.
- Place your hands. Rest one hand on your lower belly and the other on the side of your lower ribs. This lets you feel where the breath is going.
- Breathe in through your nose for a count of four. Let the belly swell gently into your hand, then feel the ribs widen to the sides. Keep the chest and shoulders quiet. The breath should feel easy, never gulped.
- Breathe out for a count of six. Use your nose or softly parted lips. Let the belly and ribs sink back slowly, as if you were fogging a window without any push.
- Let a short pause happen. Wait a moment at the bottom of the breath until the next inhale arrives on its own.
- Repeat. Four seconds in and six seconds out is ten seconds per breath, or six breaths a minute. Five minutes comes to about thirty breaths. You do not need to count them. A quiet timer is enough.
When the time is up, stay a minute longer without controlling your breath. Notice what your shoulders, jaw and hands are doing.
How to adjust the breath if you feel dizzy, tight or impatient
Most difficulties come from trying too hard. Here is how to ease each one.
If you feel dizzy or lightheaded, you are probably breathing too deeply or too fast for your body at the moment. Stop, breathe normally, and next time make the breaths smaller, with a gentler inhale. If dizziness keeps happening, check with your doctor. This also applies if you have a heart or lung condition, or take medication that affects heart rate or blood pressure, before you start any breathing practice.
If your chest or belly feels tight, the counts are probably too long. Try three in and four out, or simply make the exhale a little longer than the inhale without counting. Tightness can also mean you are pushing the belly out. Let it expand only as far as is comfortable.
If you feel impatient or your mind is racing, that is common in the first few sessions. Give your attention a small job: feel the hand on your belly rise and fall, or count breaths from one to ten and begin again. Shortening the session to three minutes is better than abandoning it.
If you cannot lie or sit comfortably, try a high-backed chair with a cushion behind your lower back. If your hips or knees complain, a rolled towel under the knees when lying down often helps.
Making it stick: pairing the breath with moments you already have in your day
A five-minute practice survives when it is attached to something that already happens. Evening is a good anchor because the day’s tasks are finished. Here are some pairings you can try:
- After you brush your teeth, before getting into bed.
- While the kettle boils, as a one-minute version with six or seven breaths.
- Right after you sit down in the car, before you turn the key.
- At the end of a long stretch at your desk. If you spend most of your day sitting, this piece on practising Qigong through a long sitting day pairs well with it, starting with the hips and breath.
A short written note helps too. Jotting two lines after each session, such as how long you did it and how your shoulders felt, makes slow change visible over a few weeks. This guide to what to write in a Taiji and Qigong practice journal suggests what is worth recording.
One thing to try tonight
Set aside five minutes this evening and breathe slowly, with your exhale a little longer than your inhale. Four counts in and six counts out is a good place to start, but a gentler ratio is fine. When you finish, write one line about how your shoulders and jaw feel. Do the same tomorrow, and look at the notes after a week.