Visual Breath Pacer (4-7-8)
Extended exhalation forces a parasympathetic shift in the autonomic nervous system via the vagus nerve. The 4-7-8 protocol (inhale 4s, hold 7s, exhale 8s) is a standard intervention for hyperarousal at sleep onset.
Ready
Vagal Nerve Stimulation
When you inhale, heart rate slightly increases (Respiratory Sinus Arrhythmia). When you exhale, it decreases. By extending the exhalation phase relative to inhalation, you increase vagal tone.
| Protocol | Ratio (In:Hold:Ex) | Primary Effect |
|---|---|---|
| Box Breathing | 4:4:4:4 | Focus, autonomic balance |
| 4-7-8 | 4:7:8 | Acute down-regulation, sleep |
| Physiological Sigh | Double Inhale : Long Exhale | Rapid CO2 offloading |
Common Mistakes
- Pushing too hard: If 4-7-8 causes air hunger and anxiety, drop the ratio to 3-5-6 or 2-4-4. The goal is relaxation, not hypoxia.
- Chest breathing: Expansion must occur in the diaphragm (belly), not the shoulders.
FAQ
- Q: Why the 7-second hold?
- A: The hold allows oxygen to fully perfuse into the bloodstream while CO2 builds up slightly, acting as a vasodilator.