Most of you remember at least briefly about the "fight or flight" response. This is simply demonstrating the "GO" part of the nerve system. It kicks in when we need an immediate response. Unfortunately it is well documented that our "modern" stresses, like traffic, deadlines, poor nutrition, chemicals, packed schedules and all that's similar all stimulate our go fast, hyperactive, run from danger, high adrenaline nerve system response - and that keeps our nerve system constantly stimulated and out of balance.
We need to have plenty of go slow, relax, kick back, care-free, no worries, lots of time, pleasant moments, type of experiences in our lives or we suffer from the effects of a nerve system that's out of balance. Most say we suffer from stress but we are really suffering from the frequent and continual stimulation from that "GO" part of our system that stress brings on.
This constant stimulation leads to stress on the heart that causes chemical changes in the fuel the cells burn, subsequent inflammation, and a cascade of events that often lead to a heart attack.
So what about the chiropractic part? Research is being done on stimulating the vagus nerve because it stimulates the organs (including the heart) to "SLOW" down and relax. So while the medical world is off on a tangent wondering how to insert implants to electrically stimulate the vagus nerve, chiropractors are already doing what we've been doing for over 100 years, gently providing the electrical stimulation to the vagus nerve every time we adjust C1, which is the top bone in the neck.
What I'm getting at here is that like all other chiropractic applications, we provide a natural stimulation to the nerve system which allows the body to better regulate and run itself. The brain is stimulated to function via sensory input from motion sensors in the joints of the body, and when we make sure all the joints are moving properly - this motion will send normal electrical signals to the brain, and on the nerves that are affected by those joints.
So if you want to prevent a heart attack, it might be very wise to make sure your chiropractor is regularly checking and adjusting your atlas bone (C1).