When you breathe in, sympathetic fibers go up to the brain, but when you expire, the vagus nerve gets stimulated and slows down your heart rate, creating heart rate variability where the pulse fluctuates (e.g., 78-80-82 bpm) rather than staying constant.
causalpending
Speaker
Unidentified Speaker — Vagus Nerve Hacks: Powerful Techniques to Enhance Health an… [irn3cFHmK-Y]Evidence Quote
“when you breathe in the lungs the sympathetic fibers go up to the brain and then when you expire your vagus nerve gets stimulated and it slows down your heart rate so your heart rate changes according to your vegus nerve and your sympathetic system”
Source
Vagus Nerve Hacks: Powerful Techniques to Enhance Health and Well-Being— Dr. Pradip Jamnadas, MDCreated: 8/11/2026, 1:38:33 AM
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