02 · The Vagus Nerve
The body’s rest-and-repair switch.
The vagus nerve is the main communication pathway between the brain and the internal organs.
It helps regulate
- Heart rate
- Breathing
- Digestion
- Immune function
- Emotional balance
When it is engaged, the body shifts into rest, repair & regeneration
- Heart rate slows
- Breathing deepens
- Digestion improves
- Inflammation settles
- Immune response balances
- Emotional balance & clarity
A well-regulated vagus nerve supports a resilient body and a calmer mind.
What happens when it is engaged
Where the sympathetic system mobilises, the parasympathetic system restores. When vagal activity increases, heart rate slows, breathing deepens, digestion resumes properly, inflammatory activity settles, immune function rebalances, and emotional regulation becomes easier. This is the state in which the body does its repair work.
How it is measured
Clinicians can observe vagal activity indirectly through heart-rate variability (HRV) - the small beat-to-beat variation in heart rhythm. A heart that is under parasympathetic influence does not beat like a metronome; the intervals vary subtly. Research associates stronger vagal activity, seen as higher HRV, with better cardiovascular and emotional health.
HRV is now measurable on most consumer wearables, which makes it one of the few physiological markers patients can track themselves. It is useful as a trend rather than a single reading, and it is easily over-interpreted - Dr Vimple will explain what your figures do and do not mean.
A heart that is under parasympathetic influence does not beat like a metronome; the intervals vary subtly.
Practices that engage it
- Deep, slow diaphragmatic breathing
- Extending the exhale relative to the inhale
- Meditation and chanting
- Structured relaxation and rest
- Cold exposure and singing
- Gentle, breath-led movement
Slow breathing is the most immediately accessible of these. Breathing at around six breaths per minute, with a longer out-breath than in-breath, measurably increases vagal tone within minutes — which is why it is the technique Dr Vimple teaches first.