Humming, chanting, and vocal toning

Hum, chant, or tone on a long exhale to engage the vagus via the throat and lengthened breath.

Why it works

Vocalizing on the exhale naturally lengthens it (the established vagal lever) and the vagus nerve innervates the larynx and pharynx, so humming and chanting are thought to add mild laryngeal vagal engagement on top of the breathing effect. The vibration and slow, sustained sound also tend to be subjectively calming.

How to do it

1. Take a comfortable breath in, then hum or tone on a long, steady exhale.
2. Let the exhale be slow and complete; feel the vibration in the throat, chest, or face.
3. Repeat for several rounds, or use a sustained "voo"/"om" if that feels natural.
4. Notice the settling rather than straining for volume.

Evidence

Humming/chanting plausibly works mainly by extending the exhale (well supported) plus possible laryngeal vagal involvement. Small studies on chanting/"om" report relaxation and some autonomic shifts, but the direct vagal-stimulation claim is not firmly established. (mechanistic)

Much of the benefit is probably the long exhale, not a special "vagus hack." Treat humming as a pleasant, low-risk extension of slow breathing rather than a proven nerve stimulator.

Common mistake

Treating humming as a magic vagus button while breathing fast and shallow around it. The exhale length is doing most of the work, so keep it slow and long.