health tips - Why Muscles Get Sore. As people age, they begin to complain more of pains in their muscles and joints. The greater the range of movement, the more flexible the joint. Different factors limit the flexibility and ease of movement in different joints and muscles. In other joints, such as the ankle, hip, and back, the soft tissue—muscle and connective tissue—limit the motion range. If you do, then, it is not so surprising if you have already experienced sore muscles.
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Connective tissue binds muscle to bone by tendons, binds bone to bone by ligaments, and covers and unites muscles with sheaths called fasciae. Sore muscles or muscle pain can be excruciating, owing to the body’s reaction to a cramp or ache. First, an unused muscle becomes sore from exercise or being held in an unusual position. The body then responds with the splinting reflex, shortening the connective tissue around the muscle.
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Spasm theory. Using some device, they measured electrical activity in the muscles. The researchers knew that normal, well-relaxed muscles produce no electrical activity, whereas, muscles that are not fully relaxed show considerable activity.
In one experiment, the researchers measured these electrical signals in the muscles of persons with athletic injuries, first with the muscle immobilized, and then, after the muscle had been stretched.
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