Yoga guide
The vagus nerve links your brain with your heart, lungs and gut, and it slows your heart. Yoga can't reset it, and resetting the vagus nerve isn't a medical term. What trials measure is heart rate variability, an indirect sign of vagus nerve activity on the heart, and the most reliable way to raise it is slow breathing, at about 6 breaths a minute.
Yoga that keeps your breathing slow and easy does that while you practise, though trials haven't shown that yoga changes your heart rate variability at rest. This guide covers what the vagus nerve does, what heart rate variability can and can't tell you, humming, chanting and other "vagus nerve exercises", what vagus nerve stimulation is, the polyvagal debate, how to breathe safely, and a gentle class with slow breathing and no breath holds.
It runs from the brainstem through the neck and chest to the abdomen, slows the heart and helps run digestion and breathing. Most of its traffic carries news from your organs up to the brain.
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Our PubMed search found no records at all for "vagus nerve reset", "vagus nerve exercises" or "vagal toning". No trial has measured a nerve being reset.
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Heart rate variability, the small beat-to-beat changes in heart rate, is used as an index of vagus nerve activity on the heart. But your breathing rate changes it directly, so a higher reading while you breathe slowly is partly the breathing itself.
Across 223 studies, slow breathing raised heart rate variability during practice, straight after it and after a course (going by the review's summary). In 84 students, 6 breaths a minute raised it more than box or 4-7-8 breathing. Breathing exercises lowered stress a little.
Reviews found no convincing evidence that yoga changes heart rate variability, mostly from small, weak trials. In a 2026 study, it rose during slow yogic breathing but not at rest after two weeks of daily practice.
An implanted or handheld stimulator is used for some people with epilepsy, depression or cluster headache, under specialist care. Yoga isn't a substitute for it.
It is the tenth cranial nerve, running "from its origin in the brainstem through the neck and the thorax down to the abdomen". It supplies the muscles of the throat and voice box, slows the heart, and helps control the gut, breathing and reflexes such as coughing and swallowing.
"The most important function of the vagus nerve is afferent, bringing information of the inner organs" to the brain. The figure often quoted, that 80% of its fibres carry messages that way, comes from a 1957 study in cats, so "most" is the safe word.
Your heart speeds up a little as you breathe in and slows as you breathe out, mostly through the vagus nerve. This rhythm is called respiratory sinus arrhythmia, and the slowing is sometimes called the vagal brake.
Researchers say heart rate variability "is able to index cardiac vagal tone", and that it is often wrongly treated as a direct measure of it. The usual vagal measures are RMSSD (root mean square of successive differences, a measure of beat-to-beat change) and HF (high-frequency) power.
"Respiration rate changes can produce large-scale shifts in RSA magnitude without affecting vagal tone." At slow breathing rates the vagal rhythm moves into a different frequency band, so studies need to know how fast people were breathing.
Many yoga studies report the ratio of low-frequency to high-frequency power (LF/HF) as a sign of nervous system balance. A review of the physiology concluded that this idea "has been disproven".
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In 13 adults over 536 nights, five consumer wearables differed from an ECG (electrocardiogram) by about 6% to 16% for night-time heart rate variability. A watch can show your own trend over weeks, not your vagal tone.
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A review of 223 studies found that slow breathing raised vagus-related heart rate variability during practice, straight after one session and after a course of sessions. We could read only its summary, so we can't give the size of the effect.
Heart rate variability peaks at about 6 breaths a minute, roughly 4 seconds in and 6 out. In 75 athletes, every rate from 5 to 7 a minute beat normal breathing. In 84 students, 6 a minute raised it more than box or 4-7-8 breathing, didn't change mood or blood pressure in one session, and caused mild over-breathing in some.
In 12 trials of 785 adults, breathing exercises lowered self-reported stress by a small amount, and eased anxiety and low mood a little. Too few trials followed people up to say whether it lasts, and the authors warn against "a miscalibration between hype and evidence".
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In the Stanford trial of 108 people, 5 minutes a day of cyclic sighing for a month improved mood and slowed resting breathing more than mindfulness, but heart rate variability didn't differ between the groups. Our physiological sigh guide has the technique.
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In 9 studies of slow breathing before bed, people said they slept better, but measured sleep didn't clearly change. Our yoga for insomnia guide covers sleep.
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Many yoga and breathing studies are small single sessions, often in journals outside the main medical index. We say where the evidence is weak.
In 14 trials, only 2 of acceptable quality, 10 reported some benefit and 9 didn't, and the review found "no convincing evidence for the effectiveness of yoga in modulating HRV". A review of 59 studies, mostly single sessions in small groups of male practitioners in India, called firm conclusions premature.
A 2018 review of 17 tai chi or yoga trials reported favourable changes, but its printed confidence intervals don't add up, it used the LF/HF-type measures above, and it couldn't separate yoga from tai chi. A 2025 review in students reported effect sizes too large to be possible.
In a 2026 study of four techniques, heart rate variability rose during paced breathing and alternate nostril breathing, not with kapalabhati (fast breathing), and didn't change at rest after two weeks: "the effect on the heart rate is achieved through direct practice". Alternate nostril breathing changed no measure in 34 students, and in 17 beginners, plain slow breathing with equal in and out breaths did best.
In 520 teenagers, 6 months of humming breath (bhramari) raised RMSSD by about 3 milliseconds against no practice, in a single-centre trial whose tables contain impossible values.
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In people with repeated reflex (vasovagal) fainting, yoga cut faints in 97 people over a year and left more people faint-free in 55, both small single-country trials. A pooled estimate was implausibly large. Our yoga for low blood pressure and yoga for PoTS guides cover fainting.
Yoga eased anxiety in diagnosed anxiety disorders, but "the certainty of the evidence was judged as very low for all outcomes". In depression it beat doing nothing but not other active treatments, and in post-traumatic stress disorder (PTSD) it eased symptoms a little in trials with a substantial risk of bias. None of these trials measured the vagus nerve.
In 24 adults, humming slowed breathing to about 6 breaths a minute and raised heart rate variability, and blocking the sound with earphones changed nothing: "The effects of humming breathing appear to be associated with the 0.1 Hz resonance frequency induced by extended exhalation rather than the vibratory sound itself." In 16 adults, humming did the same as paced breathing.
In 10 people, humming raised nitric oxide in the nose about 15-fold compared with breathing out quietly. That's about how air moves in the sinuses, not about the vagus nerve.
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Slow "Om" chanting brought heart, breathing and blood pressure rhythms into step in 9 trained speakers. In a choir, slow singing raised heart rate variability but humming a single note didn't, and the authors say singing "demands a slower than normal respiration". Paced singing raised it like paced breathing but also raised heart rate and blood pressure.
In a lab study of 61 people, 16-second pulses of cold on the neck or cheek raised a short measure of heart rate variability; cold on the forearm didn't. Cold water after exercise sped recovery of heart rate variability in athletes. No trial shows a cold shower resets anything; our vagus gadgets guide covers ice baths and their risks.
One trial of acupressure at a point on the ear raised heart rate variability for at least 5 minutes in 114 volunteers; we found no study of ordinary ear massage, gargling or eye-movement exercises. Laughing did the opposite of what's claimed: "Laughter leads to increased heart rate and reduced heart rate variability, which is similar to the effects of exercise."
NICE (the National Institute for Health and Care Excellence): "If resective epilepsy surgery is not suitable for a person with drug-resistant seizures, consider vagus nerve stimulation as an add-on treatment to antiseizure medication." It adds that there was no long-term robust evidence. The NHS lists a small device under the skin of the chest among rare other treatments for epilepsy.
For treatment-resistant depression, NICE says "Evidence on its efficacy is limited in quality", so it's used only with special arrangements, and the same goes for stimulating the nerve in the neck for migraine and cluster headache. NICE does support a handheld neck stimulator for cluster headache, which doesn't work for everyone.
The US approved an implanted stimulator for rheumatoid arthritis in 2025. In its trial of 242 people, sponsored by the maker, 35.2% improved against 24.2% with a sham device at 3 months. A stimulator worn on the ear didn't help in 113 people.
The idea that the vagus nerve can calm inflammation has some support, but through a surgically placed device in some people, not through breathing, poses or cold water. Lower heart rate variability goes with inflammation in observational studies, which can't show cause.
Much of the "freeze state" and "nervous system reset" language comes from the polyvagal theory (PVT). In 2026, 39 experts in vagus nerve physiology wrote: "All co-authors agree that major tenets of the PVT are not supported by past or current knowledge." They found no evidence for "dorsal vagal shutdown" in people.
The theory's author replied that "the charge of scientific untenability does not apply to Polyvagal Theory as formulated". Slow breathing and gentle yoga don't need the theory to be worth doing. Our somatic yoga guide covers this too.
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Lower heart rate variability goes with more severe anxiety (weak links) and with inflammation in observational studies. These are associations: they don't mean your nerve is weak, or that raising a number cures anything.
Slow breathing: "At least 5 minutes, done regularly as part of your daily routine" (from the move page's dose); about 4 in and 6 out. Crocodile breathing: "5 minutes of easy nose breathing, about 4 seconds in and 6 out (our editorial starting point): about 6 breaths a minute, the pace that raised heart rate variability most in a direct comparison of breathing patterns." (the move page's dose). Alternate nostril breathing, optional: "3 to 5 minutes of slow rounds, once or twice a day" (from the move page's dose); skip it with a blocked nose.
There's no 3D demo for this one. Our steps, from the method in the humming trials.
It works because the hum slows your breath out. Covering your ears isn't needed: blocking the sound changed nothing in the trial.
Breath reach: "5 breaths, exhale longer than inhale" (the move page's dose). Cat-cow: "8 waves, slower than feels natural" (the move page's dose). Thoracic rotation: "6 rotations per side, moving with the breath" (the move page's dose). Child's pose: 1 minute. Sun salutation A, if you like to move more: 3 slow rounds, one breath per movement (both from our yoga for stress class).
Legs up the wall: 2 minutes, hips on the floor with glaucoma or high blood pressure that isn't controlled. Lying twist: 45 seconds each side. Corpse pose: 2 minutes, or 5 to 10 if you have time, eyes open if closing them brings up distress (all from our yoga for stress class). Reclining bound angle: "Rest 2 to 5 minutes with a support under each thigh (our editorial starting point)." (from the move page's dose). Roll to your side and sit for a moment before you stand.
Not needed. Six breaths a minute raised heart rate variability more than box or 4-7-8 breathing, both of which use holds, so treat those as optional.
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Leave out kapalabhati, breath of fire and bhastrika for this purpose: kapalabhati didn't raise heart rate variability, fast techniques brought more side effects than slow ones in trials, and US health advice is that beginners avoid forceful breathing.
We found no study testing them. Gentle neck movement is fine; our yoga for neck pain guide covers it.
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Our editorial plan, from the slow breathing studies (Laborde 2022 and Marchant 2025) and the NHS breathing exercise as the site teaches it.
See the movement on the 3D figure: Slow breathing (6 breaths a minute)
The stress class is slow breathing with no holds, gentle movement, a few standing poses and rest. The breathing practice works best with its slow and crocodile breathing; its box and 4-7-8 rounds are optional. The bedtime, restorative and slow somatic classes are gentler still, and the heart health class has no breath holds.
Twenty minutes of yoga for stressful days: the NHS breathing exercise, neck, shoulder and spine moves, standing poses that warm you up, then a slow wind-down.
20 minBeginner13 movesWallA 6-minute breathing routine: slow breathing, crocodile breathing, alternate nostril breathing, box breathing and 4-7-8 breathing.
6 minBeginner5 movesNo equipmentA 20-minute bedtime yoga class on the mat: slow breathing with no holds, a few gentle movements, lying stretches and a long rest before bed.
20 minBeginner9 movesFirm cushion, wallA 45-minute restorative yoga sequence: five fully supported poses held for 4 to 10 minutes each, with slow breathing and a long final rest.
45 minBeginner6 movesFirm cushion, wallA slow 20-minute somatic yoga class: breathing, small floor movements with pauses to notice how they feel, a standing finish and a rest, every move optional.
20 minBeginner13 movesNo equipmentA gentle 35-minute yoga class for heart conditions: a 15-minute warm-up that builds slowly, short standing poses, a seated cool-down, breathing with no holds and rest.
35 minBeginner18 movesBench or box, wallA 12-minute practice for when anger builds: pause and breathe, let the tension go, then slow down to the floor. No punching, no fast breathing.
12 minBeginner9 movesWallFollow the breathing advice your own team gives you, as the slow breathing move's caution says.
Follow your specialist team's advice on activity (our suggestion; we found no yoga study).
Get up slowly from the floor and use the fainting lines below. Our yoga for low blood pressure guide covers the poses to change.
Keep your eyes open, keep practices short, and breathe slowly without holds. Our yoga for PTSD guide has more.
Slow breathing and gentle yoga are safe for most people. These are the site's lines for chest pain, fainting, dizziness, breathing practices and mental health, word for word. This is general information, not a diagnosis. A&E means accident and emergency; in the US, call 911 for 999, and use your doctor's urgent line or urgent care for NHS 111.
Call 999 if:
Call 999 if someone has any of these, and don't drive yourself to A&E:
If you feel faint, stop, lie down and raise your legs. Use the counter-manoeuvres if you can't lie down.
Lie down and raise your legs until you feel better. If you can't lie down, sit, if possible with your head lowered between your knees, and drink some water.
The NHS says fainting is "not usually a sign of something serious, but if it happens you should see a GP".
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Dizziness or light-headedness when you stand up or change position can be a drop in blood pressure (postural hypotension), not vertigo. Get up slowly, from lying to sitting to standing, and see a GP if you keep getting dizzy or fainting. Our exercise for PoTS guide covers postural tachycardia syndrome.
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Call 999 or go to A&E (accident and emergency) straight away for severe difficulty breathing (gasping, choking or not able to get words out), a chest that feels tight or heavy, pain that spreads to your arms, back, neck and jaw, lips or skin turning very pale, blue or grey, or sudden confusion. If you're more short of breath than usual, or your heart is racing, fluttering or skipping beats, contact NHS 111.
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If a breathing practice makes you dizzy, light-headed or tingly, you're probably breathing too deeply: make the breaths smaller or go back to normal breathing. If you get wheezy or tight-chested, stop and follow your action plan (our suggestions).
The seven-count hold is long and light-headedness is common at first, so practise sitting or lying down and shorten the counts while keeping the ratio if you feel dizzy. Never do breath holds in water or while driving.
If lying still brings up distressing thoughts or panic, open your eyes, sit up and breathe slowly; if slow breathing makes you dizzy or tingly, make the breaths smaller (our advice).
Never do fast breathing or breath holds before or during swimming: over-breathing before going underwater has caused blackouts and drownings (our suggestion, from a US case series of 16 people, 4 of whom died).
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With glaucoma, or high blood pressure that isn't under control, skip headstands, shoulder stands and long head-down holds. With osteoporosis, swap deep forward folds for a flat-back hinge from the hips, and twist smoothly. In pregnancy, our yoga in pregnancy guide covers the changes. NCCIH advises beginners to avoid headstands, shoulder stands, the lotus position and forceful breathing.
The NHS advises getting advice from a healthcare professional first if you have a health problem, an injury or symptoms, or have recently had a heart attack or an operation.
If you have a heart, lung or joint condition, are pregnant or have recently been unwell, start gently and read our guide for your condition. Muscle soreness for a day or two after a new exercise is common and fades as you repeat it.
Reset isn't a medical term, and no trial has measured one. Slow breathing raises heart rate variability while you do it; yoga's own effect is inconsistent, and resting heart rate variability didn't change after two weeks of daily yogic breathing.
Humming raises heart rate variability because it slows your breathing; blocking the sound changed nothing. The effect lasts while you do it.
We found no study of it.
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Brief cold on the neck or face changes a short heart rate variability reading in a lab. No trial shows a cold shower resets anything, and cold water has real risks, as our vagus gadgets guide explains.
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It shows heart rate variability, an indirect index that breathing, posture and movement change, and night-time readings differed from an ECG by about 6% to 16%. Follow your own trend, not the number.
Lower heart rate variability goes with anxiety, irritable bowel syndrome (IBS) and inflammation in observational studies, which can't show cause, and a low number isn't a sign of a weak nerve.
Experts found no evidence for "dorsal vagal shutdown" in people; the theory's author disputes their critique. Feeling shut down or numb is worth talking to a GP about.
We found no research using the phrase. Yoga trials in PTSD show small reductions in symptoms, with no vagus nerve measures. Trauma-focused therapy is the treatment; our yoga for PTSD guide covers yoga's place.
Yoga that slows your breathing to about 6 breaths a minute raises heart rate variability while you practise, which is an indirect sign of vagus nerve activity on the heart. Yoga's own effect on heart rate variability at rest is inconsistent across trials. So slow breathing in yoga does something measurable; the poses themselves haven't been shown to.
Any calm practice that keeps your breathing slow and easy, with longer breaths out and no holds: slow breathing, gentle movement with the breath and rest, as in our yoga for stress class. Fast breathing such as kapalabhati didn't raise heart rate variability in a 2026 study.
Resetting isn't a medical term, and no study has measured a reset. Slow breathing shifts your heart rhythm while you do it, which is real, but it isn't a switch you flip.
Humming raises heart rate variability because it slows your breath out; when people hummed with the sound blocked, the effect was the same. It's a pleasant way to breathe slowly, and it also raises nitric oxide in the nose.
It's the steady level of vagus nerve activity on the heart. It can't be measured directly in everyday life: heart rate variability is an indirect index, and your breathing rate changes it on its own.
It measures heart rate variability, which in one study differed from an ECG by about 6% to 16% at night. Use it to watch your own trend over weeks, not as a measure of your nerve.
A medical treatment with an implanted or handheld device, used for some people with epilepsy, depression or cluster headache, and in the US for rheumatoid arthritis. NICE says the evidence is limited for some uses, and it's used under specialist care. Yoga isn't a substitute.
Breathing exercises eased stress and anxiety a little in trials, and yoga helped anxiety symptoms, though the evidence is very low certainty. If anxiety is affecting your life, talk to your GP; our yoga for anxiety and sleep guide has more.
It's disputed. In 2026, 39 experts in vagus nerve physiology concluded its main ideas aren't supported, and its author disagrees. Slow breathing and gentle yoga don't need the theory to be useful.
Over-breathing can make you dizzy or tingly, so make the breaths smaller if that happens. Never do breath holds or fast breathing before or in water. Fainting while exercising is a 999 call.
About 5 minutes a day is a good start, as the NHS breathing exercise suggests. The changes happen while you breathe slowly, so regular short practice makes sense.
In two small trials in people with repeated reflex fainting, yoga cut faints. See a GP if you have fainted, and our yoga for low blood pressure guide covers the poses to change.
Exercise education, not a personal prescription, and clinical review of these guides is pending. If you are pregnant, have a health condition such as glaucoma, high blood pressure or osteoporosis, or have had recent surgery, check with a doctor, midwife or physiotherapist before starting, and stop for sharp or increasing pain. Health disclaimer.
