The 3-6-5 daily coherence protocol

Three sessions, six breaths per minute, five minutes each — a minimum daily coherent-breathing dose.

Why it works

Six breaths per minute (rather than five) is another common resonance target, used by the "cardiac coherence" approach developed by cardiologist David O’Hare. The 3-6-5 structure — three sessions, six breaths per minute, five minutes — spaces coherence practice across the day to address different stress windows (morning regulation, midday reset, evening recovery) and is designed to be compact enough to sustain daily rather than requiring long single sessions.

How to do it

1. Morning (after waking): five minutes at six breaths per minute to start the day in regulated state.
2. Midday (around noon): five minutes to reset accumulated midday arousal before the afternoon.
3. Evening (before dinner or sleep): five minutes to begin physiological wind-down.
4. Use the same five-in, five-out pacing or switch to a five-seconds-in, five-seconds-out pacer app.

Evidence

The 3-6-5 protocol is a clinical recommendation from cardiac coherence practitioners; the underlying slow-breathing physiology is well supported, but the specific three-session-per-day format as distinct from other dosing has not been independently trialed. Lehrer & Gevirtz’s account of how HRV biofeedback works supplies the resonance mechanism the six-breaths-per-minute target relies on, even though the 3-6-5 dosing itself is unproven. (mechanistic)

Cardiac coherence as a clinical framework is primarily French-practice medicine (O’Hare) with limited English-language RCT evidence specific to the 3-6-5 format. The physiological rationale is sound; the specific protocol is conventional rather than proven.

Sources

• Lehrer PM, Gevirtz R. (2014). Heart rate variability biofeedback: how and why does it work? Frontiers in Psychology, 5, 756.

Common mistake

Compressing the three sessions into one long session and skipping the midday and evening instances — the three-per-day spacing is designed to address arousal at different times of the diurnal cycle.