What is coherent breathing, six breaths a minute?
Breathe in for five seconds and out for five, with no holds, for six breaths a minute. It’s the pace where your heart rate swings up and down the most with each breath. In a 2026 trial, a personal rate found by testing did no better than a plain six.
Coherent breathing, resonance breathing and HRV breathing are all names for roughly the same thing. The standard biofeedback method starts by testing for your own exact resonance rate. That sounds precise, so it sounds better. When a 2026 trial put it up against a plain six a minute, the plain version did just as well.
What we’d do
Use six a minute if you want a slow pattern with no holds, or if you care about your HRV. Breathe smooth and quiet through your nose. If five seconds feels like a strain, breathe a little less deeply rather than faster. Don’t pay for a resonance test.
Why six a minute?
Your heart speeds up a little every time you breathe in and slows every time you breathe out. There’s a second rhythm too. Your blood pressure sensors (the baroreflex) nudge your heart about five seconds after each change. At around six breaths a minute, five seconds in and five out, the two rhythms line up and push the same way.
It’s like pushing a kid on a swing. Push at the right moment in each swing and it goes higher with the same effort. At their best pace, the difference between a person’s fastest and slowest heartbeat in each breath gets 4 to 10 times bigger than at rest, according to a 2020 review of the method.
That best pace sits between 4.5 and 6.5 breaths a minute for most adults, and between 6.5 and 9.5 for children. Six is right in the adult range.
Does a personal rate help?
In a 2026 trial in Poland, 88 stressed adults aged 25 to 40 were split three ways. One group breathed at a personal rate found by testing, one at a fixed six a minute, and one waited. The two breathing groups practiced at home for 20 minutes a day for four weeks, with a weekly session in the lab.
Stress, anxiety and low mood
88 stressed adults, four weeks. Sumińska and others, Scientific Reports, 2026
Fell in both breathing groups compared with the people waiting. The personal rate and the fixed six did about the same.
Small groups, so a small difference could have been missed.
Resting HRV
Same trial
Didn’t change in either group after four weeks.
They practiced at 4 seconds in and 6 out, a little different from our 5 and 5.
A surprise from the lab
In a 2025 study, 84 students tried square breathing, 4-7-8 and six breaths a minute, one session each. Six a minute raised HRV more than the other two. It also made some students over-breathe slightly, blowing off a little too much carbon dioxide. Slow doesn’t always mean small, so keep each breath quiet and no bigger than it needs to be.
Try it yourself
The timer below runs six a minute. If you’re curious which slow pace feels easiest for you, the resonance finder runs about a minute each at 6.5, 6, 5.5, 5 and 4.5 breaths a minute. Pick the one that feels easiest and stick with it. What a session does to your ring’s numbers is in does breathwork raise HRV.
Coherent breathing has where the name came from and the two big trials, which don’t agree.
3 sources
- Shaffer F, Meehan ZM, A practical guide to resonance frequency assessment for heart rate variability biofeedback, Frontiers in Neuroscience, 2020pmc.ncbi.nlm.nih.gov
- Sumińska S, Rynkiewicz A, Szulczewski M, Resonance frequency versus fixed 0.1 Hz breathing in HRV biofeedback: a four-week randomized comparison, Scientific Reports, 2026nature.com
- Marchant J et al., Comparing the effects of square, 4-7-8, and 6 breaths-per-minute breathing conditions on heart rate variability, CO2 levels, and mood, Applied Psychophysiology and Biofeedback, 2025pubmed.ncbi.nlm.nih.gov
