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Vagus Nerve Stimulation (DIY + Devices)
Humming and gargling decelerate heart rate within minutes by activating laryngeal vagal branches; the diving reflex—face in cold water—slows heart rate by 10–25% in seconds. Stephen Porges' Polyvagal Theory, reviewed in a 2025 Frontiers in Behavioral Neuroscience issue, provides the framework. This hierarchy makes vagal stimulation accessible at every budget.
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