A 65-year-old man, his wife, and 38-year-old son have been ...

The discovery of sympathetic innervation of intrafusal muscle fibers has added a significant contribution to the mechanism of sustained muscle contraction and chronic pain in FMS (27). This mechanism also explains why patients who are under emotional stress exhibit exacerbations in their symptoms (28). Thus, sympathetic hyperactivation can cause direct muscle contraction, changes in skeletal ... ................
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