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What is Sympathetic Dominance?

Author and Trusted NTP practitioner

Roy Smith

Back In Line Chiropractic

Dr. Roy Smith is an accredited SD protocol Practitioner. With almost 20 years of clinical experience, he has always had a keen interest in the "wound up" nerve system. This has led him to further his studies and training to be able to help patients experiencing these issues.
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Health & Wellness
Aug 20, 2021

What is Sympathetic Dominance?

Do you suffer from any of the following:

  • Tight shoulders, neck and skeletal muscles
  • Regular headaches that worsen as the day progresses
  • Do you feel cold
  • Do you feel tired
  • Do you have dry skin, brittle nails and does your hair fall out
  • Are you experiencing digestive issues or hormonal issues
  • Are you sensitive to light or sound

Sympathetic Dominance

Due to a series of built-in triggers, the brain knows when it needs to activate the fight or flight survival mechanism. It's called the Sympathetic Nervous System and we've known for a long time that it exists. When it activates, it suppresses your digestive system, reproductive system, immune system and the repair functions of your body.

Under normal circumstances, the Sympathetic Nervous System activates in response to extreme physical, cognitive or emotional stress. This is useful as it allows our body to adapt to situations and ensures we have enough fuel for the crisis. Medical science has led to a relatively clear understanding of the reactions in the body in these situations.

What we haven't explored in depth is what happens when this survival mechanism stays switched on or fired up for extended periods of time. This is when our body's hardwired stress response crosses out of 'normal circumstance' where they are helpful, to a scenario in which prolonged physiological change can actually cause harm.

Modern life doesn't improve this scenario. We leave demanding jobs and arrive home with financial stress sitting like heavyweights on our shoulders. We wake up with a to-do list as long as our arms. We go to bed knowing the same will wait for us the next day. Some of us have businesses, noisy or demanding family lives. Others have illnesses or sick loved ones that we worry over.

We lie awake at night worrying about mortgages, exams, interviews, relationships, and the list goes on. Typically, we don't think of these things when we think of fight or flight. But they represent only a handful of issues that can activate the survival mechanism and keep it activated.

The rest of the list may surprise you. It includes the constant barrage of light and noise we deal with, the poor posture we often engage in when we spend hours looking down at our laptops and handheld devices, and the simple fact that many of us are living life in a wound up state.

Can we live life in complete silence with the lights turned off? No. Can we avoid the use of technology? Absolutely not! Can we avoid stress and the demands of modern life completely, never facing a financial, relational or health stressor ever again? The answer to that is a resounding no!

We can think about whether or not to flex a muscle or go for a walk, but we don't think about whether or not to go into fight or flight mode. It's automatic.

If you show signs and wish to check this further, book in with Dr Roy Smith at www.backinline.com.au.

Information on this page has been extracted from SD Protocol with Permission.

FAQs About Sympathetic Dominance

How do you know if you are parasympathetic dominant?

Parasympathetic Dominance is when your body has difficulty maintaining a healthy balance between the sympathetic and parasympathetic dominance systems. This results in a reduced ability of the sympathetic nervous system function which contributes to slower healing, lack of motivation, increase chronic stress, difficulty in sleeping, poor digestion and dislike of physical activity. Additionally, heart rate variability decreases when parasympathetic activity increases.

How does exercise affect the sympathetic nervous system?

The heart rate rises quickly when the sympathetic nervous system is active. The increased anticipatory heart rate response and rapid breathing is caused by exercising. Blood pressure, heart rate and respiration are slowed down by the parasympathetic response.

Why can sympathetic responses affect the entire body?

The sympathetic nervous system has an important role to play in the body's fight or flight response. Increased heart rate, rapid breathing, increased blood pressure, and widening of bronchial passages are included in a sympathetic response. If the danger remains, the hypothalamus will send a message through the sympathetic nervous system. This will result in more hormone cortisol being produced by the adrenal glands which maintain the stress response.

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From the NTP Practitioners,  Stress

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