Tags: trigger point


trigger points

Kind of a good explanation of knots/trigger points from wikipedia:
According to proponents of the concept, a trigger point does not really cause a contraction, but rather causes a contracture. A contraction is muscular activity mediated by the nervous system, while a contracture is said to be a mechanical "sticking" of the muscle fibers with no involvement from the nervous system. The hypothesis is that usually an event of muscular overload causes a prolonged release of Ca2+ ion from the sarcoplasmic reticulum (storage unit for the muscle cell) which results in a sticking of the untrained or overloaded cells. 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. This "energy crisis" (as it is termed in the seminal work on trigger points) causes the release of chemicals that augment pain activity. Since an involved muscle is weakened by this theorised sustained shortening, surrounding muscles themselves may develop trigger points in a compensatory fashion.