Cyclic sighing (one minute of repeated physiological sighs)

Repeat the double-inhale pattern continuously for one to five minutes for a sustained shift in state.

Why it works

A single physiological sigh provides a fast acute reset; repeated cycles over a minute or more maintain the amplified CO2 off-loading and progressively deepen the parasympathetic shift. The Balban et al. study specifically tested cyclic sighing in this one-minute repeating format and found it outperformed other breathing conditions on anxiety reduction and positive affect.

How to do it

1. Set a timer for one to five minutes.
2. Breathe in a continuous rhythm: double inhale, long exhale, double inhale, long exhale.
3. Keep the pace unhurried — the exhale should be slow, not rushed.
4. After the timer, sit quietly for 30 seconds and notice the shift.

Evidence

This is the specific protocol tested in Balban et al. (2023), which found one minute of cyclic sighing reduced anxiety and improved mood more than box breathing or cyclic hyperventilation in a randomized comparison of 100+ participants over four weeks. (rct)

Single study; participants were general-population adults, not clinical anxiety populations. Effect sizes were real but modest. Do not substitute for clinical treatment of anxiety disorders.

Sources

• Balban et al. (2023), brief structured respiration practices enhance mood and reduce physiological arousal, Cell Reports Medicine
• Balban, M. Y., Neri, E., Kogon, M. M., Weed, L., Nouriani, B., Jo, B., Holl, G., Zeitzer, J. M., Spiegel, D., & Huberman, A. D. (2023). Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine, 4(1), 100895.

Common mistake

Trying to do cyclic sighing quickly in a rush to "get it done." Speed makes the second inhale a gasp and the exhale too short — both undermine the CO2 off-loading mechanism.