How do they function?
Here is how a normal muscle contracts and relaxes across a full range of motion.
When a muscle becomes injured, it will tighten or spasm, to guard itself against pain. This will cause the muscle to shorten and become weak and fatigued.
Eventually, these spasms become chronic and the muscles actually lose their ability to relax. When this happens a trigger point is activated which causes pain and stiffness.
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