
Okay, so maybe you're not plotting a huge national coup but maybe you've felt overly stressed recently. If you have, I think this is something you should take a look at.
So, you're a Type A personality, on the go 24 hours a day, seven days a week, you have a bit of a competetive edge, and that's why you never let anything pass by you without your careful consideration....and perhaps sometimes it consumes you a bit. Episodic stress can be useful and in many cases important, on the other hand, chronic stress can be dangerous.
Most of us understand the basic changes that can occur in the body, when a stressful situation presents itself: increased heart rate, blood pressure, sweating, slight nausea and many others that we have all experienced. We also understand that if someone is really uptight and anxious all of their life, they're pretty likely to form an ulcer in the stomach. Sometimes we are able to see experiments using rats in which they discover that exteme stress in rats causes ulcers. But what we are not often times exposed to, is where and how the actual damage occurs.
In your brain there are fibers that connect the different working parts, some of them can be damaged by hormones released during stress. Let's start with a situation. It's your first day at college and you're starting classes. Not only are you incredibly nervous to begin with but in your speech cless you are asked to get up and give a five minute improvisational delivery. You fumble for words and feel your face giving way to a tremendous blush. After that first day things do not get any easier, now you are being teased for the way you messed up and you can't seem to feel comfortable. This type of situation can cause serious stress, anxiety can still linger even when the person thinks they are getting accustomed. Not only does this situation damage performance for future experiences, because of the learning that took place, it can also damage performance of the nerve fibers running through the brain.
These fibers can run from the central nucleas of the amygdala, from the periaquaductal grey (PAG) in the midbrain, or from the locus ceruleas; they run to the periventricular nucleus of the hypothalamus. (This link can take you to a place where you can investigate the different areas of a brain) These areas of the brain are damaged by glucocorticoids released by the adrenals. The basic pathway for the release of the glucocorticoids is as such: The amygdala, the PAG, and the locus ceruleus send messages to the hypothalamus when there is an aversive, meaning potentially bad or dangerous, stimuli. The hypothalamus then secretes a corticoreleasing factor to the piuitary, the pituitary releases ATCH into the bloodstream. This travels to the adrenals, which in turn release the glucocorticoids. This is a cycle that is modulated by a negative feedback system.
Allowing the aversive stimuli to affect the body at a frequent rate, slowly over time destroys those important fibers. The glucocorticoids also raise the blood pressure, the pulse, and destroy operations of the immune system.
SO WHAT DOES ALL OF THIS MEAN? We're allgoing to die because we get angry in traffic all of the time? No, but knowing that this distruction occurs in the body, is one good reason to start checking alternatives.
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