Stress can mean different things to different people as each of us may have a different response to any given stimulus based on many factors. We know stress is personal and subjective and yet inarguably one of the greatest influences over our health and well being. We also know that there are tools that help us change our perception and reaction to stressful stimuli therefore offering us more potential to shift the detrimental impact.
A stressful situation — whether something environmental, such as difficulties at work, or psychological, such as persistent worry about a loved one — can trigger a cascade of stress hormones that produce physiological changes.
This combination of reactions to stress is also known as the “fight-or-flight” response because it evolved as a survival mechanism, enabling people and other mammals to react quickly to life-threatening situations. The sequence of hormonal changes and physiological responses helps someone to fight the threat or flee to safety. Unfortunately, the body can also overreact to stressors that are not life threatening (such as traffic jams, work pressure, and family difficulties).
Stress stimulus=Brain=Nervous System=Physiological changes
Over the years, researchers have learned not only how and why these reactions occur, but have also gained insight into the long-term effects stress has on physical and psychological health. Over time, repeated activation of the stress response takes a toll on the body. Research suggests that prolonged stress contributes to high blood pressure, chronic illness, inflammation, heart disease, obesity, early onset aging, dementia and also contributes to anxiety, depression, and addiction. And these are just naming a few. We are continually realizing the ramifications of ongoing stress responses to our health.
To understand stress we need to realize our brain/body complex has evolved through time to meet our ever-changing environments and what ‘survival’ has meant.
Our neural circuitry in the brain is designed to create ‘habits’ to make it easier for each of us to perform tasks without thinking. Each time you repeat a habit, whether a task, a perception, a thought, behavior or emotion, it becomes more engrained and unconscious. The same is true of the habit of stress.
Our stress and threat reactivity is partially shaped by our personal genetics and experiences but also by evolutionary biology. Believe it or not, our propensity to look for the ‘negative’ is a human trait we carry over from our early ancestors. The brain keeps us closely tuned in to what is ‘bad’ or potentially wrong in our lives to ensure our survival.
The brain is a critical hub on every level in our quest to survive. Without you realizing it, in the course of just one breath cycle, a quadrillion-plus messages/signals will cross your brain in roughly a tenth of a second. All our thinking, emotions, desires, bodily functions are courtesy of close to 1/1 trillion brain cells as they fire in our brains sending messages to other neurons. Basically the brain is a connection machine constantly moving information around.
Research is beginning to show us that much of this brain activity is dedicated in service to negative thoughts rather than positive. The reason for this can be found in our ancestry and need to survive. We needed our brains to constantly scan our surroundings for possible threats and if you weren’t diligent, you might not survive.
Technology has allowed us to actually see the functions of different parts of the brain and the roles they play. The amygdala (our alarm center) has two thirds of its cells dedicated to processing negative or potentially negative information. This part of the brain dates back to our reptilian predecessors and is often called the ‘lizard brain’. It differs from the pre frontal cortex that helps us stop, think and evaluate situations. The pre frontal cortex takes its time to evaluate data and make decisions. The amygdala scans moment to moment and makes fast snap judgments based on what is perceived as a threat. It is ‘hardwired’ to focus on the negative and quickly react.
Basically our brains categorize memories we have experienced as bad, threatening or unsafe and the amygdala stores them to be retrieved the next time a similar situation arises. This is a mechanism for keeping us safe.
Every day we are faced with trying to balance our brains deeply engrained evolutionary tendency to survive and see ‘threats’. This primal reaction is then intensified by our own unique life experiences (where ‘threats’ look different than tigers or finding food).
The stress response begins in the brain. When we experience a perceived threat, like a potential car accident, we send the information to the amygdala that then instantly sends a distress signal to the hypothalamus.
The hypothalamus is a bit like a command center. This area of the brain communicates with the rest of the body through the autonomic nervous system, which controls such involuntary body functions as breathing, blood pressure, heartbeat, and the dilation of blood vessels and small airways in the lungs .The autonomic nervous system has two components, the sympathetic nervous system and the parasympathetic nervous system. The sympathetic nervous system functions like a gas pedal in a car. It triggers the fight-or-flight response, providing the body with a burst of energy so that it can respond to perceived dangers. The parasympathetic nervous system acts like a brake. It promotes the “rest and digest” response that calms the body down after the danger has passed.
After the amygdala sends a distress signal, the hypothalamus activates the sympathetic nervous system by sending signals through the autonomic nerves causing a chain of physical reactions.
All of these changes happen so quickly that people aren’t aware of them. In fact, the wiring is so efficient that the amygdala and hypothalamus start this cascade even before the brain’s visual centers have had a chance to fully process what is happening. That’s why people are able to jump out of the path of an oncoming car even before they think about what they are doing.
As the initial surge of chemicals subsides, the hypothalamus activates the second component of the stress response system — known as the HPA axis.
The HPA axis relies on a series of hormonal signals to keep the sympathetic nervous system — the “gas pedal” — pressed down. If the brain continues to perceive something as dangerous, the body continues to stay revved up and on high alert. Stress response can become a habit based on many factors and we end up day to day with the gas pedal pushed to the floor and we don’t even realize the impact it is having across the board on our health. Because every part of the body (and mind) are interconnected this constant stress reaction sets in motion so many of the health concerns listed above and so much more.
Sound Body Wisdom practices can help you to relieve stress and improve overall health by understanding the patterns of your brain and nervous system and give you personalized tools to unwind detrimental habits. You will discover the power of your thoughts and emotions on the brain/body and how ‘stress’ can be any stimulus that directs the body towards fight or flight or imbalance.
Visit Soundbodywisdom.com for more information and tools.