What is Coherent Breath (5.5 BPM)?
Coherent breathing is a modern slow-breathing protocol used in HRV training. The exact resonance frequency varies by person, but 5 to 6 breaths per minute is a useful public timer setting. The practical version is deliberately plain: no incense, no subscription, no hidden lesson. You follow the on-screen cue, keep the breath comfortable, and stop if the body pushes back.
The exact ClearBreaths setting is 5.5s inhale, 5.5s exhale. Use the nose for the inhale when possible, keep the jaw loose, and make the exhale quiet enough that you could repeat it without strain.
Step-by-step protocol
- Sit upright or lie down if you are using the practice for sleep.
- Inhale gently for 5.5 seconds through the nose.
- Exhale for 5.5 seconds through the nose.
- Repeat until the timer ends, then take three normal breaths before standing.
The science
The strongest direct citation here is Benefits from one session of deep and slow breathing on vagal tone and anxiety in young and older adults. Its useful finding for a practitioner is modest but real: Slow breathing affected HRV indices and reduced state anxiety. The mechanism is not magic. Breathing near six breaths per minute can synchronise respiratory rhythm with heart-rate oscillation. Slow breathing research also suggests that exhale-weighted breathing can shift heart-rate variability markers and reduce state anxiety in a single session.
That does not make coherent breath (5.5 bpm) a cure. It is a state-change tool. Use it when the problem is arousal, rumination, or breath-holding under stress; use medical care when symptoms are severe, new, or physical.
Who it is for
This protocol fits people looking for calm, focus, performance support, especially when they want a timed practice rather than an open-ended meditation. It is also a useful contrast to more activating breathwork because the pace makes the exhale the main event.
Common mistakes
- Trying to breathe as deeply as possible.
- Chasing perfect HRV numbers.
- Practising only when already overwhelmed.
Variants
| Variant | Change | Use it when |
|---|---|---|
| Five-minute HRV reset | Five minutes of 5.5 seconds in and out. | Daily regulation practice. |
Troubleshooting
- The breath feels too slow: Use six seconds out and four seconds in for one minute, then return to 5.5/5.5.
Try it now
FAQ
What is the physiological sigh?
The physiological sigh is a two-part inhale followed by a longer exhale. It happens naturally in the body, and the deliberate version is used as a fast downshift when stress is high.
How many physiological sighs should I do?
For a quick reset, try three to six slow cycles. For a structured practice, use the five-minute cyclic sighing version tested by Stanford researchers.
Is physiological sighing the same as cyclic sighing?
They are closely related. Cyclic sighing usually means repeating the physiological sigh pattern for several minutes as a formal practice.
Should I inhale through my nose or mouth?
Use the nose for both inhales if you can, then exhale slowly through the mouth. Keep the second inhale small rather than forceful.
Can physiological sighing help anxiety?
It may help reduce acute stress arousal for some people. It is not a treatment for an anxiety disorder, and severe or recurring symptoms deserve clinical support.
Can I do this lying down?
Yes. Sitting is better for daytime stress because it keeps you alert. Lying down is fine for sleep or a middle-of-the-night reset.
Related techniques
Sources
- Benefits from one session of deep and slow breathing on vagal tone and anxiety in young and older adults, Magnon, Dutheil, Vallet, Scientific Reports, 2021.
- Breathwork Protocols for Health, Focus and Stress, Huberman Lab, Huberman Lab Newsletter, 2022.
Written by ClearBreaths Editorial. Reviewed by ClearBreaths Research Desk. Last reviewed .