![]() Trigger points have been a subject of study by a small number of doctors for several decades although this has not become part of mainstream medicine. Since an involved muscle is weakened by this theorised sustained shortening, surrounding muscles themselves may develop trigger points in a compensatory fashion. ![]() This "energy crisis" (as it is termed in the seminal work on trigger points) causes the release of chemicals that augment pain activity. This leads to a compression of capillaries and results in an increased local energy demand and local ischemia (loss of blood circulation) to the area. The hypothesis is that usually an event of muscular overload causes a prolonged release of Ca 2+ ion from the sarcoplasmic reticulum (storage unit for the muscle cell) which results in a sticking of the untrained or overloaded cells. Compression of a trigger point may elicit local tenderness, referred pain, or local twitch response. The palpable nodules are said to be small contraction knots and a common cause of pain. Trigger points are described as hyperirritable spots in skeletal muscle that are associated with palpable nodules in taut bands of muscle fibers.
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