the glass

cyclic sighing · one minute · a window on the street

The story

People have been told to “take a deep breath” forever. The specific pattern — two inhales through the nose, one long exhale through the mouth — is what your body already does when you sob or when you’re about to fall asleep; physiologists call it a physiological sigh, and it re-inflates collapsed air sacs in the lungs. A Stanford group asked whether doing it on purpose, five minutes a day, would do anything for mood. It did, and it beat the two things people usually recommend instead.

What it does to you

The long exhale slows the heart through the vagus nerve; the double inhale gets more air out on the way down. Over a month, people who did it daily reported more positive feeling each day and breathed more slowly at rest — the calm carried outside the five minutes.

The receipts

Yilmaz Balban, Neri, Kogon et al. (2023), Cell Reports Medicine — 108 enrolled, 100 analyzed; remote RCT, four arms (mindfulness control, cyclic sighing, box breathing, cyclic hyperventilation); 5 min/day for 28 days. Breathwork beat meditation on daily positive affect and respiratory rate; cyclic sighing largest on both, and its benefit grew with days practiced. No post-study follow-up. PMC
Zaccaro et al. (2018), Frontiers in Human Neuroscience — systematic review, 15 studies of slow breathing (under 10 breaths a minute) in healthy adults: higher heart-rate variability, more alpha EEG, and self-reported comfort, relaxation, and lower anxiety and anger. Mostly single-session effects. Frontiers
Fincham, Strauss, Montero-Marin & Cavanagh (2023), Scientific Reports — meta-analysis of breathwork RCTs: stress 12 trials, n = 785, g = −0.35; anxiety g = −0.32; depression g = −0.40, all vs. non-breathwork controls. The authors flag risk of bias and too few follow-ups to claim durability. Nature

The honest part

One trial, 100 people analyzed, self-report, remote, no follow-up after the month. The between-group differences were modest; the point is cyclic sighing was at least as good as meditation for less effort. Nobody has tested a single one-minute dose on its own — the meadow’s minute is a slice of the trial’s five.

How the city does it

The pane fogs only on the long exhale, and only when it's slow. Five of those and there's enough fog to draw in — which is the whole trick of the study, made visible on the glass.

Try it in the city →

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from Attuned Work Design

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