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Coherent breathing

Equal inhale and exhale, no holds, around five to six breaths per minute — the cadence where heart and breath fall into step.

Typical cadence

• Equal inhale–exhale (e.g., 5s in, 5s out)
• Target ~5–6 breaths/min; nasal, diaphragmatic

How it works

Heart/coherent breathing uses equal inhale and exhale with little or no holds, often around ~5–6 breaths/min. This tends to maximize cardiorespiratory synchrony, raise HRV, and support calm alertness. Functional imaging at slower rates (~5.5 bpm) shows modulation in brainstem and cortical networks involved in interoception and autonomic control.

Evidence highlights

• Equal I/E at ~5.5 bpm increases HRV in healthy subjects.
• Paced slow breathing (~5.5 bpm) engages brain regions (pons, hypothalamus, insula-related networks) and is linked with changes in alertness.
• Systematic reviews support slow breathing for increased HRV and improved affect in healthy adults.

How to practice

• Breathe in 5s, out 5s (no holds) for 2–5 minutes
• Keep the breath quiet, through the nose, and diaphragmatic

Safety notes

• If lightheaded, reduce depth/rate and pause
• People with cardiopulmonary issues should personalize cadence with clinical guidance

References

• Lin et al., 2014 — Breathing at 5.5 breaths per minute with equal inhalation-to-exhalation ratio increases heart rate variability (Int J Psychophysiol)
• Critchley et al., 2015 — Slow breathing and hypoxic challenge: cardiorespiratory consequences and their central neural substrates (PLoS ONE)
• Zaccaro et al., 2018 — How breath-control can change your life: a systematic review on psycho-physiological correlates of slow breathing (Frontiers in Human Neuroscience)

Disclaimer: This information is educational and not medical advice. If you have cardiopulmonary or other medical conditions, consult a healthcare professional before changing your breathing practices.