Know your Vagal Tone Spectrum

Vagal tone refers to the activity of the vagus nerve, which controls your involuntary "rest-and-digest" functions like heart rate, digestion, and immune responses. High vagal tone indicates a well-regulated nervous system that easily manages stress; low vagal tone leaves your body stuck in a chronically activated "fight-or-flight" mode. [1, 2, 3, 4]

1. https://en.wikipedia.org/wiki/Vagal_tone
2. https://my.clevelandclinic.org/health/body/22279-vagus-nerve
3. https://ouraring.com/blog/how-to-improve-your-vagal-tone/
4. https://neurodivergentinsights.com/how-to-improve-vagal-tone/

The Vagal Tone Spectrum

High Vagal Tone: Associated with a lower resting heart rate, stable blood pressure, and higher heart rate variability (HRV). Your body can easily recover from stress and return to equilibrium.

Low Vagal Tone: Associated with stress sensitivity, anxiety, digestive issues (like IBS or acid reflux), and chronic inflammation. [1, 2, 3, 4]

1. https://www.massgeneral.org/news/article/vagus-nerve
2. https://pmc.ncbi.nlm.nih.gov/articles/PMC4076387/
3. https://pubmed.ncbi.nlm.nih.gov/27010234/
4. https://ouraring.com/blog/how-to-improve-your-vagal-tone/

How It’s Measured

Vagal tone cannot be measured directly, but it is typically assessed indirectly via Heart Rate Variability (HRV). A high HRV indicates strong vagal tone, meaning your heart rate fluctuates healthily in response to your breathing and environment. [1, 2, 3, 4]

1. https://drruscio.com/vagal-tone/
2. https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/vagal-tone
3. https://health.clevelandclinic.org/what-does-the-vagus-nerve-do
4. https://www.massgeneral.org/news/article/vagus-nerve

How to Improve Vagal Tone

You can actively stimulate your vagus nerve to enhance your vagal tone and shift your body out of stress mode

Deep, slow breathing: Practicing diaphragmatic breathing (e.g., box breathing or 4-7-8 breathing) signals safety to your nervous system.

Cold exposure: Splashing freezing water on your face or taking a cold plunge.

Vocal stimulation: Because the vagus nerve passes through the throat, humming, singing, or gargling water vigorously can stimulate it.

Mind-body practices: Activities like yoga, meditation, and acupuncture. [1, 2, 3, 4, 5]

For a deeper dive into nervous system regulation, you can explore the Dr. Ruscio Guide on Vagal Tone or review Mass General Hospital's Vagus Nerve Overview on gut-brain health

1. https://health.clevelandclinic.org/vagus-nerve-reset
2. https://www.morningsideacupuncturenyc.com/acupuncture-vagus-nerve-modulation
3. https://www.drcarlarainbow.co.uk/post/polyvagal-theory-a-science-backed-understanding-of-fight-flight-and-freeze
4. https://drruscio.com/vagal-tone/
5. https://ouraring.com/blog/how-to-improve-your-vagal-tone/