Resonant breathing 5.5-5.5

How to do it

1. Find a seat where your back can be upright, or lie on your back. Rest your hands and soften your face.
2. Turn on the guide on your phone. Half a second is hard to count, and following the sound or the curve is easier than keeping track.
3. Breathe in through your nose for 5.5 seconds. The air comes in evenly, unhurried, and your belly opens first.
4. Breathe out through your nose for 5.5 seconds, just as evenly. You don't stop between one phase and the next.
5. If you'd rather count, count slowly to five and let the turn come a beat later.
6. Keep going for 10 minutes, which is about 54 breaths. When you drift, come back to the sound.
7. When you're done, stay still for half a minute breathing however you like, then get up slowly.

What resonant breathing is

It's slow, symmetrical breathing aimed at one specific pace: the average of what labs call resonance frequency. At 5.5 seconds a phase, the cycle takes 11 seconds.

Compared with coherent breathing 5-5, each phase gains half a second. It sounds like nothing, but you feel it: you have to take the air in more calmly to make it last. The real difference is something else. In a lab, resonance frequency is measured person by person. This page gives you the average, not your own number.

Where it comes from

The term comes from heart rate variability biofeedback. Evgeny Vaschillo, in St. Petersburg, studied how heart rate swings as breathing changes pace. With Paul Lehrer and Bronya Vaschillo, he published a training manual for resonant frequency biofeedback in 2000. The authors say they began trying the method in the 1990s.

In 2006 the same group measured 56 adults. Resonance frequency was lower in taller people and in men, had nothing to do with age or weight, and stayed the same across ten sessions.

In 2014, Lehrer and Gevirtz summed it up: the average sits near 0.09 Hz, or about 5.5 breaths a minute, with breaths of roughly 11 seconds. That's where 5.5-5.5 comes from.

What people use it for

It's mostly used by people who already have a practice and want longer, quieter sessions: ten minutes in the morning, or at the end of the afternoon to put some distance between work and the rest of the day.

It's also popular with people who train with a heart rate sensor and like to watch their heart rate variability as they breathe. You don't need one to practice. Without a sensor, what matters is that the pace feels comfortable.

What the studies say

A 2014 study of 47 college students compared four patterns: 6 and 5.5 breaths a minute, each with equal phases or with a longer exhale. The 5.5 pattern with equal phases produced the highest heart rate variability. All four left participants more relaxed than before they started.

In 2017, Steffen and colleagues compared breathing at each person's resonance frequency, breathing one breath a minute faster, and sitting quietly. The resonance group reported better mood and had lower systolic blood pressure during a mental task.

A 2020 meta-analysis pooled 58 controlled trials of heart rate variability biofeedback and found a small to moderate effect. Keep in mind what that covers: programs with sensors and coaching, not a fixed count at home. And a 2023 trial of 400 people, who breathed at about 5.5 a minute without sensors for four weeks, found no advantage over a placebo breathing pace.

What it feels like and what to notice

The first minutes take patience. Eleven seconds a breath is less than half of many people's usual pace, and your body may ask for a sigh. Give it one and pick the rhythm back up.

After a few minutes, many people notice their pulse in the chest or neck rising and falling with the breath. That's normal. Stop if you feel dizzy, get tingling in your fingers or lips, or feel air hunger that won't ease: those are signs you're overbreathing.

Variations

• Easier (variation): coherent breathing 5-5, six breaths a minute. Use it for a few days before dropping to 5.5.
• Shorter (variation): the same 5.5-5.5 for 5 minutes, about 27 breaths.
• Slower (variation): 6-6, five breaths a minute. Tall people sometimes find it more natural.
• Fitted to you (variation): try each pace between 4.5 and 6.5 breaths a minute, the range described for adults, for a couple of minutes, and keep the one that feels easiest. It's trial and error, not a measurement.

Common mistakes

• Mixing up slow and big. If you stretch the phase by taking more air, you'll end up dizzy. Lengthen the time, not the volume.
• Fighting the half second. Nobody counts 5.5 precisely. Follow the guide and don't correct yourself.
• Treating the average as your number. 5.5 is a group mean. If 5-5 or 6-6 sits better, that's your breath.
• Starting here with no practice. Ten minutes at this pace is long for a first session.
• Tightening your throat to slow the air. You regulate the air with your belly and ribs, not by squeezing.

How often and how long

The guided session lasts 10 minutes. Once a day is enough to find out whether you like it. Lab programs usually ask for daily practice over weeks, though the 2020 meta-analysis found no clear differences by number of sessions or weeks.

If ten minutes feels long, do five. A short practice you repeat beats a long one you drop.

Before you start

• Stop and breathe normally if you get dizzy, tingly or short of breath.
• Not behind the wheel and not in water.
• If you have a heart, lung or blood pressure condition, or you're pregnant, check with your care provider first.
• Studies done with sensors don't turn this page into a treatment: it's a practice.