Cyclic sighing owes much of its sudden popularity to one specific piece of research: a 2023 randomized study from Stanford. If you have read our beginner guide to the technique, this article zooms in on the science instead — what the study actually tested, what it found over a month, and, just as importantly, the context that keeps a single promising trial from being oversold as proof.
What the study tested
The trial compared a few brief daily practices in adults over one month: three different five-minute breathing exercises and, as a comparison, an equal dose of mindfulness meditation. Everyone did their assigned practice for five minutes a day. That design matters — it was not breathing versus nothing, but breathing versus a credible, popular alternative, which is a more demanding test than simply beating a do-nothing group.
What cyclic sighing was
In the study, cyclic sighing followed a specific shape: a first inhale, a second smaller "top-up" inhale stacked on it, then a long, slow exhale — repeated for the five minutes. That double-inhale-then-extended-exhale is exactly the pattern Breath Tempo paces in its Cyclic Sighing exercise. It is an exhale-weighted practice with no breath holds, distinct from rapid or continuous breathing styles.
What it found
Over the month, the cyclic sighing group reported the largest improvement in daily positive mood among the practices studied, and also showed a small reduction in resting respiratory rate. Both are genuine, measured outcomes. Notice their character, though: an improvement in self-reported positive affect and a modest physiological shift — encouraging and consistent with what many practitioners feel, but specific and bounded, not a sweeping health transformation.
Keeping it in context
Here is the discipline the result deserves. It is one study, with a particular population, a one-month window, and largely self-reported mood outcomes. A single well-run trial is a reason for interest and further research — not proof that cyclic sighing is universally superior to meditation or other breathing, and certainly not evidence it treats any condition. The honest reading is "a promising finding worth replicating", which is genuinely good news without becoming a miracle claim.
Trying it sensibly
If the research makes you curious, try the app version briefly and gently. Keep both inhales comfortable rather than maximal — the second is a small top-up, not a second full breath — and let the long exhale release smoothly without squeezing out the last bit of air. A few minutes is plenty; the study used five. And the usual caution applies even to gentle patterns: repeated deeper breathing can cause lightheadedness, so practise seated, and stop if you feel dizzy, tingly, anxious, or uncomfortable.
A calm takeaway
The 2023 Stanford study gave cyclic sighing a real evidence base: over a month, five daily minutes of the double-inhale, long-exhale pattern was linked to better positive mood and a slightly slower resting breath, edging out even meditation in that trial. Treat that as an encouraging, well-conducted single study — reason to try the pattern, not proof of a cure — and practise it gently, stopping if anything feels off.