24/08/2023
Vagus Nerve
Vagus, which is Latin for wanderer or traveller, is our 10th Cranial Nerve and the longest nerve in the body. There are actually 2, one on each side of the body but usually referred to as singular. It travels from the brain stem through the neck and connects with the cardiovascular system, digestive system and even the reproductive system. It basically takes readings from all the systems and organs and relays information to and from the brain, like a neural super-highway.
Simplified, the Vagus Nerve interfaces with the Parasympathetic Nervous System (PNS) or -rest and digest, part of our Autonomic Nervous System. Why is this important? Because when we are under stress (physical OR psychological/emotional) our Sympathetic Nervous System (SNS) is stimulated - that’s our “fight or flight” response, and although this response is essential for survival, we are not meant to remain in this state for long periods. The PNS is the “braking system” for the SNS, and brings us out of that fight or flight response, into a calmer more balanced state, or homeostasis, and it is the Vagus Nerve that activates our PNS.
Vagal tone refers to how efficient our Vagus Nerve is functioning. High Vagal tone is associated with better blood glucose regulation, lower risk of diabetes, stroke and cardiovascular disease, decreased inflammation, improved immune function, better sleep and mood. Mayo Clinic, among others use an implanted device to stimulate vagus Nerve as a treatment for depression.
So what can we do to improve our Vagal tone? There are several things, but the most effective is Meditation, especially when combined with deep breathing, (with longer exhalation) yogic breathing, or with chanting/ humming. The auditory vibration of humming or rhythmic chanting is a long proven method to stimulate the vagus nerve.(singing, gargling and laughing will also do it)
Cold water is another method to stimulate Vagal nerve. Cold water therapy or cold plunges (check out Wim Hof) or putting you face in ice cold water for 30-60 seconds, or at the end of your shower, switch to cold water for 30 seconds, and work up to a minute or two.
Exercise or mindful movement like yoga, physical touch, like a good long hug or a massage, laughter, intermittent fasting, adding probiotics and healthy fats to our diet and acupuncture are also great ways to engage our vagus nerve, improve our vagal tone and regulate our nervous system.
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