Technique · Daily calm · HRV

Coherent Breathing (5.5-5.5): HRV & Daily Calm

BreatheForCalm Team General wellness guide · 6 min read · Updated 2025
Inhale 5.5sExhale 5.5s

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What is coherent breathing?

Coherent breathing means breathing at approximately 5–6 complete breaths per minute — far slower than the average adult rate of 12–20. The most studied version: 5.5 seconds in, 5.5 seconds out, with no holds, just a smooth continuous wave.

Also called resonance breathing, this rate is thought to align with the body's resonance frequency — where cardiovascular, respiratory, and nervous system rhythms synchronise to maximise heart rate variability (HRV).

What is HRV and why does it matter?

Heart Rate Variability is the slight variation in time between consecutive heartbeats. Higher HRV correlates with better stress resilience, cardiovascular health, and emotional flexibility. Slow coherent breathing measurably peaks HRV during and after sessions.

How to practise

  1. Sit or lie comfortably. Close your eyes.
  2. Inhale slowly through your nose for 5.5 seconds.
  3. Exhale slowly for 5.5 seconds.
  4. No pause — a smooth, continuous wave.
  5. Aim for 10–20 minutes once or twice daily.
💡 Start with 5 in / 5 out and build toward 5.5–6 over a few days if needed.

Safety

⚠ Note: One of the safest techniques available. No holds, no hyperventilation risk. Suitable for beginners, high blood pressure, elderly, and most pregnancy stages. If dizzy, breathe less deeply — keep the rhythm.
Is this the same as Wim Hof breathing?
No — nearly the opposite. Wim Hof involves rapid hyperventilation followed by extended holds. Coherent breathing is slow and gentle with no holds.
How long until I see HRV improvement?
Single sessions produce immediate calm. Measurable HRV improvements in research appear after 4–8 weeks of regular daily practice.