The Vagus Nerve: Your Body's Built-In Reset Button

The Vagus Nerve: Your Body's Built-In Reset Button

By Leslie Burgie, APRN  |  Nurse Practitioner · Women's Hormone Health · 9D Breathwork Facilitator

You already have a built-in pathway to calm. It runs from your brainstem to your gut, touches nearly every major organ in your body, and responds — directly and measurably — to conscious breathing. It's called the vagus nerve, and understanding it may change how you think about stress forever.

What Is the Vagus Nerve?

The vagus nerve is the tenth cranial nerve and the longest nerve in the autonomic nervous system. The name comes from the Latin word for "wandering" — and that's exactly what it does. It wanders from the brainstem down through the neck, chest, and abdomen, branching to connect with the heart, lungs, liver, stomach, intestines, and more.

It is the primary pathway of the parasympathetic nervous system — the "rest and digest" branch that governs recovery, healing, digestion, immune regulation, and calm. When the vagus nerve is active and healthy, your body can shift out of stress mode and into restoration mode efficiently. When vagal tone is low, that shift becomes difficult or impossible.

Vagal Tone: Why It Matters

Vagal tone refers to the relative activity of the vagus nerve — how readily and efficiently it can activate the parasympathetic response. High vagal tone is associated with greater resilience: the ability to recover quickly from stress, regulate emotions effectively, and maintain physiological stability under pressure.

Low vagal tone, by contrast, is associated with chronic anxiety, poor emotional regulation, inflammatory conditions, cardiovascular risk, and difficulty recovering from stress. Research has linked low vagal tone to depression, PTSD, irritable bowel syndrome, and a range of chronic health conditions.

The most commonly used measure of vagal tone is heart rate variability (HRV) — the variation in time between heartbeats. Higher HRV indicates that the heart is responding flexibly to changing demands, which reflects healthy vagal activity. Lower HRV suggests a system that is stuck in sympathetic dominance.

Vagal tone is not fixed. It is trainable. And the most direct, accessible way to train it is through the breath.

How Breathing Activates the Vagus Nerve

The vagus nerve runs alongside the respiratory system, and breathing — specifically slow, deliberate exhalation — is one of the most powerful stimulators of vagal activity. When you extend your exhale, you stimulate baroreceptors in the lungs and aorta that send signals through the vagus nerve to the brainstem, triggering a parasympathetic response.

This is why deep breathing works — not as a psychological distraction, but as a direct physiological intervention. It is giving the vagus nerve the signal it needs to activate the parasympathetic system. The body responds because it's receiving the right input.

Physiological effects of vagal activation include:

• Heart rate slowing — a direct effect of vagal activity on the sinoatrial node

• Cortisol reduction — the HPA axis receives the "stand down" signal

• Improved digestion — parasympathetic activation restores gut motility and enzyme production

• Anti-inflammatory effects — the vagus nerve regulates the inflammatory response through what's called the cholinergic anti-inflammatory pathway

• Improved mood — vagal activity is associated with increased serotonin and GABA activity

Other Ways to Stimulate the Vagus Nerve

Breathwork is the most direct and reliably effective method, but it's not the only one. Other evidence-supported approaches include:

• Cold water exposure — cold water on the face or a brief cold shower activates the dive reflex, which stimulates the vagus nerve

• Humming, chanting, or singing — the vagus nerve runs adjacent to the vocal cords, and vibration from these activities stimulates it directly

• Social connection — positive social engagement activates the ventral vagal complex, part of Stephen Porges' polyvagal model of nervous system regulation

• Yoga — particularly forms that emphasize slow, extended exhalation and restorative postures

• Laughter — genuine laughter produces diaphragmatic movement that stimulates vagal pathways

• Massage — particularly of the neck, ears, and feet, where vagal branches are accessible

Why 9D Breathwork Is Particularly Effective

Standard breathwork activates the vagus nerve through the breath pattern alone. 9D Breathwork amplifies this effect by layering immersive sound technology beneath the breath — specifically binaural beats and isochronic tones that entrain the brain toward lower frequency states (theta and delta) that are associated with deep parasympathetic activation.

The result is that the nervous system isn't just being told to calm down — it's being guided into a physiological state where calming down is what happens naturally. The vagus nerve activates, the HPA axis receives the stand-down signal, and the body does what it was designed to do when it finally feels safe.

Many people report that a single 9D Breathwork session produces a felt shift in their baseline nervous system state that persists for days. This is the vagus nerve — trained, activated, and demonstrating what it's capable of when given the right conditions.

Your nervous system is not broken. It's adapted. The question is what conditions it needs to adapt back.

Start Here

If you want to experience vagal activation directly and understand what it feels like in your body, my live 9D Breathwork sessions through The Breath Detox are designed exactly for this. They are a gentle, clinically informed entry point. Find upcoming dates at thebreathdetox.com.

About the Author

Leslie Burgie, APRN is a nurse practitioner, women's hormone health specialist, and certified 9D Breathwork facilitator based in Ohio. She operates two virtual practices: Optimize & Elevate (optimizeandelevate.com), a women's hormone health practice serving Ohio, and The Breath Detox (thebreathdetox.com), a 9D Breathwork facilitation practice. Her clinical work focuses on the intersection of HPA axis regulation, hormonal health, and somatic nervous system healing.