Slow breathing benefits: what it does to your body

What does slow breathing do to your body?

Slow breathing usually means 4 to 10 breaths a minute (Russo et al. 2017). At rest, most adults breathe about 12 to 20. Slowing down changes three things you can measure.

First, your heart rhythm. Your heart speeds up slightly as you breathe in and slows as you breathe out. Breathe slowly and those swings grow. They’re largest at about 6 breaths a minute, the pace researchers call resonance, though the exact best pace varies a little from person to person (Lehrer & Gevirtz 2014).

Second, a reflex that steadies your blood pressure. At that slow pace, the heart’s swings fall into step with the baroreflex, the body’s own blood-pressure regulator, and it seems to work harder for a while (Lehrer & Gevirtz 2014).

Third, how you feel. People who breathe slowly tend to report more calm and comfort, and less tension (Zaccaro et al. 2018).

In 5sOut 5s

Which slow breathing benefits have been measured?

Here is each benefit with what was tested, one number and one limit. Where a breath helps, it plays right here.

Your heart rhythm swings wider. Higher HRV.

The best-measured effect of all. Heart rate variability (HRV) is the small beat-to-beat change in your heart rate, and it tends to be higher when your body is at rest.

A review of 223 studies found that voluntary slow breathing raised the “rest” side of HRV during practice, straight after one session and after programmes of several weeks (Laborde et al. 2022). The limit: HRV is a marker. A higher number doesn’t prove a long-term health benefit by itself.

More on what the number means in what is HRV, and how to train it in how to improve HRV.

Your blood pressure dips a little, if it runs high.

Across 17 studies of people with high or borderline-high blood pressure, breathing at 10 breaths a minute or fewer was linked to an average drop of about 5.6 mmHg systolic and 3.0 mmHg diastolic (Chaddha et al. 2019). Results varied widely between studies, and people with normal blood pressure weren’t tested.

Full guide: breathing exercises to lower blood pressure

You feel less stressed, by your own account.

In a review of 12 randomised trials with 785 adults, breathwork, mostly slow breathing, lowered self-reported stress more than control conditions: a small-to-medium effect (Fincham et al. 2023). Anxiety and low mood eased by similar amounts. Every outcome was self-reported, and most trials were at moderate risk of bias.

A larger review of breathing therapies for anxiety found a bigger effect, across 40 trials, but 35 of them were rated at high risk of bias (Leyro et al. 2021).

Your mood lifts, a little.

In a remote trial of 108 adults, 5 minutes a day of cyclic sighing (two breaths in, one long breath out) for 28 days lifted positive mood more than mindfulness meditation did (Balban et al. 2023). The groups were small, and resting heart rate and HRV didn’t change. The physiological sigh shows you how, and why do I sigh so much? explains the sighs your body takes on its own.

You may sleep a little better.

In a review of 9 studies with 457 people, slow breathing before bed improved how long and how well people said they slept. Sleep measured by devices and in sleep labs was inconclusive (Eide et al. 2026). For bedtime breaths, see breathing exercises for sleep.

Your attention may hold a little longer.

In one small study, 8 weeks of coached slow belly breathing improved sustained attention more than in a group who didn’t practise, though that group improved too (Ma et al. 2017). Across 15 smaller studies, slow breathing was also linked to changes in brain-wave activity, and people described feeling more relaxed and also more alert and full of energy (Zaccaro et al. 2018). Promising, early and easy to try before something that needs your focus.

A stressful moment hits a little softer.

In a trial of 66 adults, 5 minutes of slow breathing before a stressful test blunted the rise in heart rate and anxiety, compared with breathing normally (McAllister et al. 2026). It was one session, and cortisol didn’t respond in any group.

Why does slow breathing calm you down?

Nobody has the whole answer yet, but three pieces fit.

The out-breath is the calming half. Each time you breathe out, your heart slows a touch. A slow rhythm gives that slowing more time, again and again (Lehrer & Gevirtz 2014).

The pace may matter to your brain, too. In mice, removing about 175 neurons in the brain’s breathing centre left breathing intact but made the animals calmer (Yackle et al. 2017). That points to a direct line between breathing and alertness. It hasn’t been tested in people.

And people have found this pace for centuries without trying. In one study, reciting the rosary or a yoga mantra slowed breathing to almost exactly 6 breaths a minute, down from about 14 (Bernardi et al. 2001).

You’ll see “reset your nervous system” a lot. It’s a figure of speech. What slow breathing does is gentler, and better measured: it helps your body shift towards rest. There’s more in how to calm your nervous system.

Is deep breathing the same as slow breathing?

Not quite, and the difference matters. “Take a deep breath” is what people say, but the research is about slow breathing. Big breaths can make you over-breathe: you blow off too much carbon dioxide and feel light-headed or tingly. How comfortably you sit with carbon dioxide is its own topic: CO2 tolerance.

Even careful breathing at 6 a minute led to mild over-breathing in one lab study (Marchant et al. 2025). So aim for slower, not bigger: quiet, easy breaths, low in your belly, through your nose if you can. Most of the benefits of deep breathing you’ll read about come from the slow part.

Slower, not bigger. The calm is in the pace, not the size of the breath.

How slow is slow enough?

Anything from 4 to 10 breaths a minute counts, and most research sits near 6. The first three patterns below are in that range; box breathing and 4-7-8 dip below 4, because of their holds. The table shows one round, the pace and how long 6 rounds take, so you can pick one that suits the time you have.

If 6 a minute feels like a stretch, start at about 8 or 9: 3 seconds in, 4 out, a count you can save as your own pattern in Breathform with Breathform Full. Slower comes with practice, and it should never feel like a struggle. Your everyday pace is a useful starting point: see what a normal breathing rate is, and how to count yours.

How quickly does slow breathing work?

Some effects start within the first minutes. HRV rises during practice itself (Laborde et al. 2022), and after one 5-minute session, both younger and older adults reported less anxiety (Magnon et al. 2021). That study had no comparison group, so some of the calm may have come from simply sitting quietly.

Other effects need practice. The longer trials ran for 4 to 12 weeks of regular sessions (Balban et al. 2023, Birdee et al. 2023). A few minutes most days is a fair way to find out what it does for you.

Routine · 5 minutes

The 5-minute daily practice

1. Sit back with your feet flat, or lie down. Rest one hand on your belly.
2. Breathe in softly through your nose for 5 seconds.
3. Breathe out for 5 seconds, as smooth as the in-breath.
4. Keep going for 5 minutes, about 30 rounds. If 5 feels long, use 4. Same time each day, if you can.

The breathing is easy; the habit is the hard part. On a busy day, 2 minutes still counts.

Does slow breathing lower cortisol?

The results are mixed, so take any promise of “lower cortisol” with a pinch of salt. In one small study, 8 weeks of coached, very slow belly breathing lowered cortisol, while a control group’s didn’t change (Ma et al. 2017). Its groups weren’t truly randomised.

In other trials, cortisol didn’t move at all (McAllister et al. 2026), or it fell more with a breath hold while one HRV measure fell too (Byrne et al. 2026). So: stress-hormone results are mixed. How you feel is the better guide.

Do breathing exercises actually work?

For heart rhythm, yes: slow breathing raises HRV across more than 200 studies (Laborde et al. 2022). For stress and mood, the honest answer is “probably a little”.

The biggest single trial is the most sobering. Among 400 adults, coherent breathing improved stress, anxiety and mood, but no more than a placebo breathing practice at 12 breaths a minute (Fincham et al. 2023). Both groups were breathing on purpose, so the trial tested the slower pace, not breathing against nothing.

A 12-week trial in 100 adults found the same pattern: anxiety fell in both slow-breathing groups, and HRV didn’t change (Birdee et al. 2023). Taking time to breathe, on purpose, seems to help. The exact count may matter less than the habit.

So: slow breathing reliably changes your heart rhythm, and it probably helps you feel calmer, with modest, mostly self-reported evidence.

Every study on this page (19)

• Russo et al., 2017: An overview of research in healthy people suggests slow breathing affects the heart, lungs and nervous system; more study is needed.
• Lehrer & Gevirtz, 2014: Heart rate swings most at around six breaths a minute; this review says a blood-pressure reflex is the likeliest reason.
• Zaccaro et al., 2018: In 15 small studies of healthy people, slow breathing was linked with feeling more relaxed and alert, and less anxious.
• Laborde et al., 2022: Across 223 studies, slow breathing raised heart-rhythm signs of calm, during practice and after, though that alone doesn't prove a health benefit.
• Chaddha et al., 2019: Across 17 trials in people with high or borderline-high blood pressure, regular slow breathing modestly lowered blood pressure, though results varied.
• Fincham et al., 2023: Pooled trials suggest breathwork modestly eases stress, anxiety and low mood compared with control groups, though most trials had weaknesses.
• Leyro et al., 2021: Across 40 trials with 3,047 people, breathing-based therapies eased anxiety more than comparison groups, but most trials had design flaws.
• Balban et al., 2023: Five minutes a day of cyclic sighing lifted mood a little more than mindfulness meditation, in 108 adults.
• Eide et al., 2026: Across nine studies, slow breathing before bed improved how well people felt they slept, but sleep-lab and tracker results were inconclusive.
• Ma et al., 2017: In 40 IT workers, eight weeks of coached belly breathing lowered a stress hormone; gains in mood and focus were less clear.
• McAllister et al., 2026: In 66 adults facing a stress test, box breathing or a long out-breath beforehand softened the rise in heart rate and anxiety.
• Yackle et al., 2017: In mice, removing about 175 nerve cells from the brain's breathing centre left breathing normal but made the animals calmer.
• Bernardi et al., 2001: Reciting the rosary or a yoga mantra slowed 23 healthy adults' breathing to about six a minute, with stronger, synchronised heart rhythms.
• Marchant et al., 2025: In 84 students, six breaths a minute raised heart-rhythm signs of calm modestly more than box or 4-7-8 breathing; none changed mood.
• Magnon et al., 2021: In 47 younger and older adults, anxiety was lower after one five-minute slow-breathing session, though the study had no comparison group.
• Birdee et al., 2023: In 100 healthy adults, anxiety fell over 12 weeks of slow breathing, with no clear difference between longer and equal out-breaths.
• Byrne et al., 2026: In a 32-person pilot, adding a hold after breathing in lowered a stress hormone more than plain slow breathing; neither changed mood.
• Fincham et al., 2023: In 400 UK adults, four weeks of slow coherent breathing did no better than a faster placebo breathing practice; both groups improved.
• Laborde et al., 2019: In 64 healthy young adults, a month of 15-minute evening slow-breathing sessions improved self-rated sleep more than time on social media.

What can’t breathing exercises do?

Plenty, and it’s worth knowing before you start:

• They don’t add oxygen. At rest your blood is already nearly full of it. Breathing faster or deeper won’t “flood” your brain.
• They don’t detox you or boost your immune system: neither is supported. Slow breathing doesn’t alkalise your blood either; only fast over-breathing does, and that’s what makes hands tingle.
• They won’t knock you out. They can help you wind down, which is different.
• They aren’t a treatment. For blood pressure, anxiety or sleep problems, they sit alongside the care you have, not instead of it.

Several of these come from popular books: James Nestor’s Breath is checked claim by claim on its own page.

What’s left is still worth having: a free, quiet way to slow your heart a little and steady yourself, any time. If you want to see where your everyday breathing sits, start with your normal breathing rate. Every study behind this page is on our science page, the words are explained in the breathing glossary, and you can breathe along with the four free practices on Breathe now.

Questions people ask

How many breaths a minute is slow breathing?

Researchers usually mean 4 to 10 breaths a minute (Russo et al. 2017), against a typical resting rate of about 12 to 20. Most studies use about 6 a minute, which is 5 seconds in and 5 out. You don’t need to hit an exact number: anything that feels slow, smooth and easy counts.

How long should I do slow breathing each day?

Between 5 and 15 minutes is a good range. In one trial, 5 minutes a day for 28 days lifted mood; in another, 15 minutes each evening for 30 days improved how people rated their sleep. A short session most days seems to matter more than a long one now and then. Two minutes still counts on a busy day.

Is slow breathing good for anxiety?

It may help. Reviews of breathing-based programmes find less anxiety than in comparison groups, though many trials were small or at risk of bias. Slow breathing with a longer out-breath is the usual starting point. If anxiety is what brought you here, breathing exercises for anxiety has breaths for different moments.

Does slow breathing lower your heart rate?

For a moment, on every breath: your heart slows a little each time you breathe out. Over a session, the effect on average heart rate is small. In one trial, slow breathing before a stress test blunted the rise in heart rate, but 28 days of daily practice didn’t change resting heart rate in another. There’s more in how to lower your heart rate.

Why does slow breathing make me dizzy?

Usually because the breaths got bigger as they got slower. Breathing in more air than you need lowers carbon dioxide in your blood, which can make you light-headed or tingly. Keep each breath quiet and easy, through your nose if you can. If you feel dizzy, take a few normal breaths, then carry on more gently.