Bhramari (humming bee breath)

Exhale on a humming sound with fingers covering the ears to deepen the vagal vibration.

Why it works

Humming generates nasal nitric oxide (a bronchodilator), increases sinus ventilation, and produces vibration that stimulates the vagus nerve via the larynx and thorax. Occluding the ears with fingers intensifies the perceived resonance and reduces external sensory input, which narrows attention inward — a mild sensory withdrawal that reduces the sympathetic orientation response. The extended exhale adds the standard vagal brake activation.

How to do it

1. Sit with eyes closed.
2. Gently place your thumbs or fingers over your ears (shanmukhi or simply block the ears lightly).
3. Inhale through the nose for 4 counts.
4. Exhale on a continuous, mid-pitched "mmmm" hum for 6–8 counts — feel the vibration in the skull and chest.
5. Repeat 5–10 rounds. Open your eyes slowly and sit for a moment before moving.

Evidence

Bhramari practice shows modest evidence of reducing heart rate, blood pressure, and anxiety in small controlled studies. Nasal nitric oxide produced by humming has robust physiological evidence from airway research independent of the yoga context. Weitzberg and Lundberg measured that humming increases nasal nitric oxide roughly fifteen-fold over quiet exhalation, giving the humming-specific NO mechanism a directly quantified basis rather than an inferred one. (observational)

Bhramari-specific yoga trials are small and short-term. The nitric oxide finding is physiology research not a wellbeing outcome study; extrapolating from it to anxiety outcomes is mechanistic reasoning.

Sources

• Eby (2007), nasal nitric oxide and humming — physiology of the sound, American Journal of Respiratory and Critical Care Medicine (for the NO mechanism)
• Weitzberg E, Lundberg JON (2002). Humming Greatly Increases Nasal Nitric Oxide. American Journal of Respiratory and Critical Care Medicine, 166(2):144-145.

Common mistake

Humming in the throat rather than allowing resonance to drop into the chest and sinuses — the higher-pitched, throat-only hum reduces both the vagal vibration and the sinus NO effect.