Page 30 of the book, in Pranayama
Vagus Nerve Exercises: Which Have Evidence, Which Don't
Slow breathing, humming, cold water, gargling and more, each checked against the research. What the vagus nerve actually does, which exercises can calm you, and which claims are hype.
Some "vagus nerve exercises" really can calm your body within minutes, especially slow breathing with long exhales and briefly cooling your face. Others, like gargling or humming, are plausible but barely studied. And the idea that you can permanently "reset" your vagus nerve with a few tricks is marketing, not science. Here's each popular exercise, checked against the evidence.
What the vagus nerve actually does
The vagus nerve is a long nerve running from the brainstem to the heart, lungs and gut. It's a major part of the "rest and digest" side of the nervous system. Among other jobs, it helps slow the heart. That's why your heart rate naturally dips a little each time you breathe out, and why heart-rate variability (HRV) is often used as a rough indicator of vagal activity. HRV is influenced by many things, though, so it's an imperfect measure.
The exercises, graded
| Exercise | What happens | Evidence |
|---|---|---|
| Slow breathing with long exhales | Slows heart rate and shifts HRV toward a calmer pattern; a 2023 trial found 5 minutes a day improved mood | Good |
| Cold water on the face | Triggers the diving reflex, which quickly slows the heart | Good for short-term effect |
| Regular aerobic exercise | Linked to higher resting HRV over time | Good |
| Humming or chanting "om" | Lengthens the exhale; very few direct studies | Early |
| Gargling | Uses throat muscles supplied by the vagus nerve; little direct research | Very limited |
| Ear massage, eye movements, "vagus reset" routines | Popular on social media; claims far outrun research | Unproven |
| Consumer vagus stimulation gadgets | Some devices are FDA-cleared for specific conditions like certain headaches; wellness claims for stress are largely untested | Condition-specific |
Three that are worth your time
1. Long-exhale breathing (2–5 minutes)
- Breathe in gently through your nose for a count of four.
- Breathe out slowly through pursed lips for six to eight.
- Repeat for two to five minutes.
Cyclic sighing, two inhales then one long exhale, is a variation with good early evidence. See our comparison of calming breaths.
2. The cool-face reset (30 seconds)
Splash cool water on your face or hold a cool, damp cloth over your eyes and cheeks for 15 to 30 seconds while breathing slowly. It's a quick way to take the edge off a spike of stress. Use cool, not icy, water.
3. Humming exhale (1–2 minutes)
Breathe in through your nose, then hum on a long, slow out-breath. It's essentially long-exhale breathing with sound, and many people find it soothing. Our guide to bhramari, the bee breath, shows the yoga version.
About "vagal tone" and polyvagal theory
Much online vagus content comes from polyvagal theory, which links different branches of the vagus nerve to states like "safe," "fight or flight" and "shutdown." Many therapists find the language helpful, but scientists widely dispute its physiology: a 2023 review in Biological Psychology argued that its core premises are untenable. You don't need the theory for the practical exercises above to work.
Common questions
Can I "reset" my vagus nerve?
Not in the permanent sense many videos suggest. You can shift your body toward a calmer state in the moment, and regular habits like exercise, good sleep and slow breathing support that over time.
How do I know if it's working?
Feeling calmer, a slower heartbeat and relaxed breathing are good signs. HRV from a wearable can show trends, but it's affected by sleep, alcohol, illness and more, so don't obsess over single readings.
What about medical vagus nerve stimulation?
Implanted vagus nerve stimulators are FDA-approved for certain conditions such as some cases of epilepsy and treatment-resistant depression. That's a medical treatment prescribed by specialists, very different from wellness exercises.
Related guides
- Nervous system regulation: what works, graded by evidence
- "Vagus nerve reset" exercises: a skeptic's guide
- Humming and the vagus nerve: what's proven
Sources
- Balban MY et al. Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine, 2023 — slow, exhale-focused breathing
- Grossman P. Fundamental challenges and likely refutations of the five basic premises of the polyvagal theory. Biological Psychology, 2023 — critique of polyvagal theory
- Vierra J et al. Effects of sleep deprivation and 4-7-8 breathing control on heart rate variability and blood pressure. Physiological Reports, 2022 — immediate heart-rate and heart-rate-variability changes with slow breathing
