A simple breathing technique that outperformed meditation in a Stanford study
The physiological sigh, also called cyclic sighing, has been getting a lot of attention on social media, and for once, the underlying science largely supports it. A randomized controlled trial published in Cell Reports Medicine compared five minutes of cyclic sighing to mindfulness meditation and two other breathing protocols in 114 volunteers over 28 days. Cyclic sighing produced the greatest daily improvement in positive affect and the largest reduction in anxiety, outperforming meditation by about one-third on mood measures. The technique is simple: two nasal inhales in quick succession (the first full, the second a short top-off) followed by a slow, extended exhale. This pattern deflates over-inflated alveoli, shifts the CO2-to-oxygen ratio, and activates the parasympathetic nervous system through vagal changes, lowering heart rate within seconds. Like most viral health trends, cyclic sighing gets overhyped, and some claims go well beyond what the evidence supports. But the core finding is solid: five minutes a day, done consistently, can measurably shift your stress baseline. The practice is free, requires no equipment, and can be done anywhere.