Yogic Path

4 Ways Yoga Helps To Activate Your Body’s Ultimate Chillax Mechanism (Parasympathetic Nervous System)

Updated on 10 September 2020 • 6 minute read
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Maybe the most important teaching is to lighten up and relax.

– Pema Chodron, Buddhist Monk & Author

Ancient Yogis believed that the spinal cord is the highway to infinite. 

In Yogic Tradition the spine is regarded as the holder and transformer of prana (aka chi energy, vital force energy).

If the vital energy flowing through it moves freely and without blockage we experience higher levels of thinking, feeling, and being. 

If there is an imbalance of energy or a blockage in the spinal cord we are unable to reach those higher states of consciousness and instead we become stuck in survival, impulse, and other lower-minded states. 

(source: giphy)

Your body is wise and intelligent and knows what to do to keep this balanced flow of energy running through your entire nervous system, not just the spinal cord. 

The crowning achievement of your body is the Central Nervous System (CNS) which is comprised of your brain and spinal cord. 

Think of it as a central command station that processes over 11 million bits of information per second thanks to its 86 billion neurons (brain cells).

Brain neurons sending and receiving information. (source: Harvard University via Giphy)

At any given moment your nervous system is hard at work sending and receiving signals of either danger or safety from different parts of your body. 

Your Peripheral Nervous System (PNS) sends most of the information from your extremities to your CNS for processing. 

A branch of the PNS is called the Autonomic Nervous System (ANS) which can be viewed as the “automatic” nervous system. 

Your ANS helps you process what’s going on in your outer world 24/7 non-stop without you having to lift a conscious finger. 

It helps you scan your environment for potential threats. 

The problem today is that it’s on constant overdrive because we’re increasingly more and more chronically stressed out, overwhelmed, overstimulated, and fatigued. 

This leads to an ANS imbalance – an overactive stress response and an underactive chillax response. 

ANS imbalanced can lead to trouble sleeping, trouble managing emotions, metabolism problems, trouble thinking clearly, and even chronic illness. 

That’s why it is so very important to know how to activate the chillax response…

 

A Quick Overview of the 2 Branches of Your ANS: 

Your ANS oversees many of your body’s vital functions and controls the activities of target organs, smooth muscle, and glands. 

Your ANS has two branches that act much like yin-yang

They are complementary opposites. 

If one is activated, the other is suppressed and vice versa. 

 

They are called the sympathetic nervous system (SNS) and the parasympathetic nervous system (PSNS). 

 

The SNS, which acts like the gas pedal, revs up our body and mind whilst activating the fight-or-flight response. 

This is the branch that reacts to stressful situations by arousing a defensive and protective mode. 

People with insomnia and anxiety tend to have an overactive SNS

 

The Parasympathetic system is your body’s ultimate chillax mechanism that acts as the brake pedal. 

The PSNS oversees the body’s relaxation response as well as a healing response. 

People with insomnia and anxiety benefit greatly from learning to consciously invoke this branch in order to rebalance the entire nervous system. 

 

Like night and day or the sun and the moon the SNS and PSNS work in opposing ways: 

 

Sympathetic Stimulation:

– Dilates pupils

– Inhibits salivary glands

– Increases heart rate

– Increases blood pressure

– Increases breath rate 

– Inhibits digestion by restricting intestinal movement and gastric secretions

– Raises blood sugar by stimulating glucose production

– Stimulates the secretion of stress hormones like adrenaline

– Blood vessels dilate in skeletal muscles in preparation for “fight or flight”

– Sweat glands are activated

– Inhibits bladder contraction impacting urination

– Inhibits defecation

– Inhibits sexual arousal 

– Inhibits the lacrimal gland 

 

Parasympathetic Stimulation: 

– Constricts pupils

– Stimulates the flow of saliva

– Decreases heart rate

– Decreases blood pressure

– Decreases breath rate

– Stimulates digestion by enabling intestinal movement and gastric secretions 

– Balances blood sugar levels 

– Stimulates the secretion of relaxation hormones such as acetylcholine

– Blood vessels in skeletal muscles constrict

– Sweat glands relax

– Contracts the bladder stimulating urination

– Stimulates defecation

– Stimulates sexual arousal 

– Stimulates the lacrimal gland and causes tearing

 

Parasympathetic nerves are found in at the base of the head (brain stem) and also at the base of the spine. 

Sympathetic nerve fibers are spinal nerves that run along the middle spine: 

The 2 Branches of Your ANS. (Source: Pearson Prentice Hall, Inc.)

 

Ganglia refers to a cluster of nerve cell bodies. 

Parasympathetic ganglia start at the base of the brain stem through cranial nerves such as the glossopharyngeal nerve (aka Cranial Nerve IX), and the submandibular ganglion: (1)

 

(source: Rajat Singhal via Slideshare)

 

(source: teachmeanatomy.info)

 

The Vagus Nerve & the Relaxation Response:

The Vagus nerve is the longest, most complex of all parasympathetic fibers. 

Known as the tenth cranial nerve, or Cranial Nerve X, the Vagus Nerve runs from the brainstem through the face, esophagus, and neck, to the heart and lungs, down to the abdomen. In the abdomen, the vagus nerve is connected to the viscera and greater part of the GI tract. 

 

By stimulating the Vagus Nerve we initiate the Relaxation Response and help the body to respond more calmly to stress.

One proven way to stimulate this very important nerve is through intentional, deep, belly breathing.

As Dr. Esther Sternberg, a stress and healing researcher at the Nat’l Institute of Mental Health, explains, the stress response is the gas pedal, and the Vagus nerve is the brake:

“The relaxation response is controlled by another set of nerves — the main nerve being the Vagus nerve. 

Think of a car throttling down the highway at 120 miles an hour. 

That’s the stress response, and the Vagus nerve is the brake. 

When you are stressed, you have your foot on the gas, pedal to the floor. 

When you take slow, deep breaths, that is what is engaging the brake.” (2)

Benefits of an Activated (Stimulated) Vagus: 

 

  • It plays an anti-inflammatory role in the body. People with chronic anxiety and depression have higher levels of inflammation in the gut and other parts of the body as well as increased risk of leaky gut, which we’ve seen is linked with chronic inflammation (3)

 

  • Promotes neurogenesis (regeneration and growth of brain cells). One study found that “increasing adult neurogenesis is sufficient to reduce anxiety and depression-related behaviors.” Antidepressants increase neurogenesis, however, neurogenesis via chronic vagal nerve stimulation was found to be “much faster than that induced by antidepressant drugs.”  (4) (5) 

 

  • It greatly increases BDNF levels in the brain’s hippocampus region. BDNF (brain-derived neurotrophic factor) is a brain chemical that’s like brain fertilizer. It’s thought to play a role in the regulation of stress response and mood disorders. People with anxiety and depression are found to have lower levels of BDNF, especially in the hippocampus. The great news is that the same study that linked chronic vagal nerve stimulation to neurogenesis also found that consistently stimulating the vagus “did induce a robust increase in the expression of BDNF in the hippocampus.” (4)

 

4 Ways Yoga Can Help Stimulate The Vagus Nerve & Activate The Chillax Mechanism:

Regular elicitation of the Relaxation Response can prevent, and compensate for, the damage incurred by frequent nervous reactions that pulse through our hearts and bodies.

― Herbert Benson, author of ‘The Relaxation Response’

As mentioned, a big part of yogic practice focuses on awakening the vital energy of the spine. 

The following four practices have been shown to increase PSNS activity and activate your body’s innate chillax mechanisms: 

 

1- Pranayama – Yogic Breathwork

(source: @nrdc via giphy)

The word ‘pranayama’ literally translates to ‘regulation of vital force energy.’ 

Although there are many different pranayama practices and techniques, we’re just going to focus on two elements that studies show quickly increase PSNS activity: 

1 – belly breathing 

2 – longer exhalations 

 

Quick 2-minute pranayama practice: 

1 – Sit comfortably with your spine erect and straight.

2 – Relax the shoulder, neck, and jaw

3 – Close your eyes

4 – Inhale for 4 counts by engaging your lower belly (belly expands outwardly)

5 – Exhale for 6 or 8 counts as your lower belly contracts towards the spine. 

6 – Repeat steps 4 and 5 for at least 10 rounds. 

 

For more guidance on how to adopt a simple daily pranayama practice go here

 

2- Mantra Chanting

(source: @amandaceemedia via giphy)

Believe it or not, chanting helps calm the emotional brain too. 

One study using functional Magnetic Resonance Imaging (fMRI) to scan the brains of subjects chanting found that it also significantly deactivates the amygdala, the brain’s fear center which is closely interconnected with the stress response. (6)

The vibrations from the vocalizations of chanting are also believed to stimulate the Vagus Nerve because its nerve fibers travel down the middle ear and through the neck. (7)

 

3- Meditation (Dhyana)

Meditation, which in Yoga is called Dhyana, is an ancient practice that only in the last few decades has garnered the attention of the scientific and medical community. 

There are many different kinds of meditation – mantra meditation, mindfulness meditation, loving-kindness meditation, etc. 

Each style offers multiple benefits one of them being that ability to help us hit the pause button in order to allow relaxation to take place. 

 

4- Asana (Physical Poses) 

Moving the body mindfully, deliberately, and gracefully in a sequence of postures can help to stimulate nervous system networks. 

Studies also find that the consistent practice of yoga asana can help to enhance ANS (autonomic nervous system) functions such as heart rate and blood pressure. (8)

One study found that the practice of Iyengar style yoga (which uses many props such as chairs and ropes) increased parasympathetic activity while also increasing Heart-Rate Variability (HRV) which is a known indicator of health, longevity, and emotional regulation. (9)

 

 

 

References:

(1) Autonomic nervous system. In: Power I, Kam P, eds. Principles of Physiology for the Anaesthetist, 2nd Edn. New York: Oxford University Press, 2008; 57–61

(2) http://www.npr.org/2010/12/06/131734718/just-breathe-body-has-a-built-in-stress-reliever

(3) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1430829/

(4) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2879889/

(5) https://www.ncbi.nlm.nih.gov/pubmed/25833129

(6) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3099099/

(7) https://www.youtube.com/watch?v=VAL-MMYptQc

(8) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4097908/

(9) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2176143/

 

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