As people age, they begin to complain more of pains in their muscles and joints. They seem to stiffen up with age, and such commonplace activities as bending over for the morning paper can make them wince.

Such pain can grip so fiercely that they are sure it begins deep in their bones. But the real cause of stiffness and soreness lies not in the joints or bones, according to research at the Johns Hopkins Medical School, but in the muscles and connective tissues that move the joints.

The frictional resistance generated by the two rubbing surfaces of bones in the joints is negligible, even in joints damaged by arthritis.

Flexibility is the medical term used to describe the range of a joint’s motion from full movement in one direction to full movement in the other. The greater the range of movement, the more flexible the joint.

If you bend forward at the hips and touch your toes with your fingertips, you have good flexibility, or range of motion of the hip joints. But can you bend over easily with a minimal expenditure of energy and force? The exertion required to flex a joint is just as important as its range of possible motion.

Different factors limit the flexibility and ease of movement in different joints and muscles. In the elbow and knee, the bony structure itself sets a definite limit. In other joints, such as the ankle, hip, and back, the soft tissue—muscle and connective tissue—limit the motion range.

The problem of inflexible joints and muscles is similar to the difficulty of opening and closing a gate because of a rarely used and rusty hinge that has become balky.

Hence, if people do not regularly move their muscles and joints through their full ranges of motion, they lose some of their potential. That is why when these people will try to move a joint after a long period of inactivity, they feel pain, and that discourages further use

What happens next is that the muscles become shortened with prolonged disuse and produces spasms and cramps that can be irritating and extremely painful. The immobilization of muscles, as researchers have demonstrated with laboratory animals, brings about biochemical changes in the tissue.

However, other factors trigger sore muscles. Here are some of them:

1. Too much exercise

Have you always believed on the saying, "No pain, no gain?" If you do, then, it is not so surprising if you have already experienced sore muscles.

The problem with most people is that they exercise too much thinking that it is the fastest and the surest way to lose weight. Until they ache, they tend to ignore their muscles and connective tissue, even though they are what quite literally holds the body together.

2. Aging and inactivity

Connective tissue binds muscle to bone by tendons, binds bone to bone by ligaments, and covers and unites muscles with sheaths called fasciae. With age, the tendons, ligaments, and fasciae become less extensible. The tendons, with their densely packed fibers, are the most difficult to stretch. The easiest are the fasciae. But if they are not stretched to improve joint mobility, the fasciae shorten, placing undue pressure on the nerve pathways in the muscle fasciae. Many aches and pains are the result of nerve impulses traveling along these pressured pathways.

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