To show the feasibility of the improved optical detection setup for image Processing data acquisition in a moire pattern, a projection moire arrangement is adopted.

From the outer fringes we can monitor the variation of the muscle and realize the nervous behavior from the moving rate of the outer fringes.

For a body to act , its skeletal system, nervous system and muscular system must be integrated and coordinated. The bones comprise the skeletal system and muscles are the organs of the muscular system. By contracting and pulling the ends of the muscles closer together, this provides the forces that cause body movement.

Although moire auto-measurement applications are laboratory oriented, practical on-line use of the technique has become feasible because of current techniques of fringe-pattern monitoring and recording, and computer processing. There have been primary improvements in this system which can be applied to many other biomechanical activities. Here we discuss as the following two

cases:

1.Monitor muscles impulsion in a long time steady standing condition :

When a man is standing upright with his feet apart ( a little wider than the shoulders ), placing both fists at the waist for ten or more minutes. He will find that his body begins to vibrate involuntarily(Fig.4).

The heart functions as a muscular pump that forces blood with oxygen through the blood vessels to the head. Along the path of branches of subclavian and common carotid arteries , the heart supplies the blood to the brain and muscles associated with them. When a human stands, the force is not enough from the heart to supply oxygen to the brain without the help of body movement, because the head is higher than the other parts of the body. So we can find a human being will appear to have a slightly vibrating movement when standing for five to twenty minutes. This means the nervous system automatic releases many impulses produce a relatively short-term effect on the muscles it influences, and helps the heart provide oxygen to the brain. It's interesting for us to observe this phenomenon of muscles impulsion. A muscle is composed of many muscle fibers. The contractility of muscle is controlled by the nervous system. Many nerve endings are distributed all over a muscle and those along the endings which control the contraction of a muscle are called kinetic nerve endings. In general the kinetic endings in a muscle are not excited and contracted at the same time, but some are excited and contracted, but others are inhibited and relaxed. In normal muscle activities, some parts in a muscle are shortened, while others are lengthened. This has proves a great help for the body's improvement of the compensating function.

Here we are interested if the movements are integrated and constant or the movements of the body and limbs are corresponding and coordinated.

2. Monitor the muscles impulsion on the pronator quadratus :

The pronator quadratus runs from the distal end of the ulna to the distal end of the radius. The behavior of the movement on the pronator quadratus is important information for Chinese orthodox traditional medicine. From the point of view of the Chinese medicine, one can obtain the conditions of health from the slight motions of the pronator quadratus. A human body acts under the unified command of the nervous system. A pathological change at some part of the body will result in its functional disturbances, and this will bring a response in the activities of the pronator quadratus.