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1.5. DYSFUNCTION
1.5.1. Causes and Mechanisms
When functioning normally, a muscle has optimum circulation and innervation, is able to move freely, is unimpaired in contracting and relaxing, and has normal elasticity and strength. Ali movements should be free of pain. Muscle function may depart from this norm in many ways, primarily because muscles are among the most susceptible of body structures. They must con-tinually readjust to their use, disuse, or misuse. Muscle shortening frequently results. Stiff or shortened muscles are often activated in move-ments in which they otherwise would not take part. This overuse in turn leads to injury and/or to excess inhibition of their antagonists. In generał, the shorter the muscle, the morę it may inhibit its antagonists. Therefore, stimulating and streng-thening a muscle’s antagonists always aids treat-ment. However, notę that the shortened muscle being treated should always be stretched before its antagonists are strengthened.
Shortened muscles may cause pain from the periosteum, tendons, or muscle belly, including referred pain to other structures or segments. In a synergistic group, no one muscle should be shorter than the others of the group. A stiff, shortened muscle will be subjected to greater stress when contracted suddenly and forcefully, thus damaging itself and/or its associated tendon. This can be prevented by stretching the relevant muscle or muscle group.
Normal rangę of movement is determined by several structures: skin, subcutaneous tissue, muscles, ligaments, joint capsules, joint surfaces, and intraarticular structures. Changes in any of these structures alter ranges of movement. Conditions such as septic or aseptic intiammations may cause restricted movements when acute, and pathologic-al instability when chronic. The structures most affected are the fascia, joint capsules, ligaments, and joint cartilages. An example is the develop-ment of ankylosing spondylarthritis (Morbus Bechterew). An initial instability becomes hypo-mobility through degenerative change. Subse-quent development may further restrict move-ment ranges, and occasionally lead to ankylosis. If a reduced rangę of movement is caused by shortened muscles, then treatment by stretching increases and may restore the rangę of movement to normal.
1.5.2. Symptoms
Dysfunction due to shortened structures can be detected by observing one or morę of the following changes it may cause:
1. Pattern of movement,
2. Volume and swelling and/or distention of a muscle,
3. Elasticity of a muscle,
4. Rangę of movement at a joint,
5. Joint play (section 1.6.3, p. 9),
6. Ouality of the passive stop, end feel (section 1.6.3, p. 9); most important.
In addition to these indicators, a patient may experience fatigue, pain radiating to other muscles and structures, and a feeling of stiffness in the shortened muscle(s). Shortened muscles may also irritate and damage peripheral nerves and blood vessels; examples include sports injuries, and the scalenus, the supinator, the pronator and pirifor-mis syndromes. Poor physical condition, inadequ-ate coordination, or unaccustomed movement often cause altered circulation and faulty muscle movement patterns. According to Vladimir Janda(l), this leads to constant micro-traumata, which, in turn, subsequently effects alterations in patterns of movement with chronic muscle spasm, contractures and pain. In an advanced case, joint function is altered and degenerative changes at the joints result. Stretching of the relevant muscle(s) is one way of preventing this chain of events.
1.6. MANUAŁ THERAPY METHODS
1.6.1. The Basics of Stretching
Ali therapy techniques including stretching should be based on thorough examination. Stretching techniques differ primarily by the type and degree of patient involvement in procedures administered by the therapist. Common to all procedures is a basie, safest sequence of events based on the principle that a muscle is most relaxed and therefore may be maximally stretched immediate-ly after an isometric contraction. According to Sherrington(2), the stronger the contraction (with-out pain), the greater the subsequent relaxation.
So all procedures start with a static contraction of the shortened muscle(s). Then the muscles are relaxed, which makes them morę easily stretched for a period of a fraction of a second up to 10 or 12 seconds in pathological cases. During this period, the muscles can be safely stretched. Often patients cannot contract from an extreme position, so treatment procedurę cannot begin there. In these cases, it is best to move back to a position in the rangę of movement where the patient can easily contract, and begin the procedurę there.
Muscles are most amenable to stretching when they are warmed up in the physiological sense, by preliminary exercise rather than by the application of passive, external heat. Thus all treatment should start with some form of warmup. The best and most specific warmup exercise is contraction
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