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 joints 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.
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