Vagus Nerve Exercises: Slow Breathing, Humming and What the Evidence Says

01What

What does the vagus nerve do?

The vagus nerve is the tenth cranial nerve and the longest in the body. It carries signals in both directions between the brain and the heart, lungs, stomach and intestines. When it is more active, the heart rate slows, digestion is supported and the body moves toward a “rest and digest” state. It also forms part of the gut–brain axis and has anti-inflammatory effects through what is called the cholinergic anti-inflammatory pathway. A review in Frontiers in Psychiatry described its role in mood, stress and inflammation.

02HRV

Vagal tone and heart rate variability

“Vagal tone” is not measured directly. Researchers estimate it through heart rate variability, the natural variation in time between heartbeats, especially the variation that follows breathing (respiratory sinus arrhythmia). Higher HRV is generally linked with better ability to adapt to stress. Many wearable devices now estimate HRV, but readings vary between devices and with sleep, alcohol, illness and training, so trends over time are more meaningful than single numbers.

03Breathing

Slow breathing: the best-supported exercise

• Sit or lie comfortably and relax your shoulders.
• Breathe in gently through the nose for about 4–5 seconds, letting the belly rise.
• Breathe out slowly through the nose or pursed lips for about 5–6 seconds.
• Aim for around six breaths a minute.
• Practise for 5–10 minutes once or twice a day, and during stressful moments.
• A systematic review found slow breathing increases HRV and is associated with relaxation and reduced anxiety and arousal.
• See also deep breathing for anxiety.

04Other

Other techniques

• Humming or chanting: humming lengthens the out-breath and may have a calming effect.
• Gargling and singing: involve muscles of the throat supplied by the vagus nerve; evidence is limited.
• Cold water on the face: triggers the diving reflex, slowing the heart rate briefly.
• Physical activity: regular exercise is associated with higher resting HRV.
• Yoga and tai chi: combine movement and slow breathing.
• Social connection and laughter: plausible benefits for stress, though not specific to the vagus nerve.
• Massage: may support relaxation.

05Routine

A simple 10-minute routine

• 2 minutes of slow breathing at six breaths a minute.
• 2 minutes of humming on the out-breath.
• 2 minutes of gentle neck and shoulder stretches.
• 2 minutes of slow breathing with longer exhalations.
• 2 minutes of quiet attention to the body, noticing tension and letting it go.
• Pair with a regular cue, such as before bed or after lunch.

06Claims

What vagus nerve exercises cannot do

Social media often presents vagus nerve “hacks” as cures for anxiety, trauma, digestive problems, inflammation and fatigue. The evidence does not support these broad claims. Breathing and relaxation techniques can reduce feelings of stress and help some people manage anxiety, but they do not replace evidence-based treatments such as cognitive behavioural therapy, medicines where needed, or proper investigation of physical symptoms. Medical vagus nerve stimulation is a specific treatment for some conditions, prescribed by specialists.

07Who

Who might benefit

• People who feel tense or anxious and want a simple calming tool.
• Those who have trouble switching off before sleep.
• People with stress-related muscle tension.
• Anyone wanting a short daily relaxation habit.
• People with panic attacks can use slow breathing as part of a wider plan; see how to stop a panic attack.

08Safety

Safety tips

• Do not hold your breath for long periods, especially if you have a heart or lung condition.
• Stop if you feel dizzy or light-headed and return to normal breathing.
• Cold water techniques can trigger a strong drop in heart rate; avoid them if you have heart problems, unless your doctor agrees.
• Breathing exercises should feel comfortable, not forced.

09Cases

Three common situations

• Racing mind at bedtime: 10 minutes of slow breathing in bed can help many people fall asleep.
• Stressful meetings: a minute of slow breathing with longer exhalations beforehand can reduce physical tension.
• Persistent anxiety affecting daily life: breathing exercises can help, but therapy is likely to be needed.

10Summary

Key points to remember

• The vagus nerve helps the body rest and recover.
• Slow breathing at about six breaths a minute has the best evidence.
• Other techniques are plausible but less studied.
• These exercises support, but do not replace, treatment for anxiety or medical problems.