Fibromyalgia syndrome (FMS) etiology is a chronic musculoskeletal system characterized by widespread pain and hyperalgesia in the body that is not yet known. At the same time, FMS patients are accompanied by functional emotional disorders including persistent muscle soreness, muscle spasms, mood disorders such as chronic fatigue, sleep disturbances, paresthesia, morning stiffness, depression, and cognitive disorders. The prevalence in the general population in the world between 2-4%, but reaching up to 7% between 50-80 years of age the prevalence of a study conducted in Turkey were found to be 3.6%. Frequently seen in women between the ages of 40-60, the quality of life of patients with FMS falls because of generalized pain in their bodies, accompanied by stress in 30-45% of patients.

According to Chaitow, there are 3 factors in the etiology of the dysfunctional model of FMS syndrome (biochemical, biomechanical, psychosocial) : (1) Negative emotional state may cause specific biochemical change, weakening of immune functions and change in muscle tone (2) Hyperventilation, blood oxygenation at the neural level, general anxiety and anxiety state, change in the structural components of the thoracic and cervical region (3) Chemical changes in blood flow may cause emotional and structural changes. The neuroendocrine hypothalamic pituitary that controls primer stress response may have abnormal release of corticotropin releasing hormone, adrenocorticotropic hormone, and cortisol, which are part of the adrenal axis. Hypothalamic corticotropin releasing hormone delays corticotropin release by insufficiency of interleukin-6 regulation in the neuronal function defect. Although the pathophysiology is not yet fully understood, it is thought to be related to environmental and genetic factors. The basal autonomic status of FMS patients is characterized by increased sympathetic system and reduced parasympathetic system. The most basic complaints of patients are generalized pain. For this reason, peripheral and central nociceptive pathways are dominant in the view of being active in FMS patients. Intramuscular connective tissue dysfunction, myofascial tissue inflammation and fibroblasts and release of pro-inflammatory cytokines cause chronic peripheral sensitization in these patients. Some authors have reported that trigger points have central sensitization-inducing effects, while others have indicated that such a situation is not the case because the patient with each trigger point is not FMS. In recent biopsy studies, it has been found that the level of collagen in the endomyositis of the FMS muscles is increased, the production of N-carboxymethylsine, which is the oxidative stress marker, is increased, and the tissue damage is increased and the CD-68 positive macrophage levels in the interstitial tissue are increased in the muscles. The disturbance in the peripheral and central mechanisms leads to impairment of the postural control and therefore the increase in the frequency of falls with equilibrium losses. In the treatment of these symptoms, it was reported that the application of myofascial relaxation techniques had positive effects on patients' quality of life, sleep patterns, joint stiffness, neck and back pain.

Myofascial release therapy Myofascial relaxation restores pain relief by restoring soft-touch dysfunctions. Behind the therapeutic effects of myofascial relaxation is the effect on the connective tissue, that is, the fascia, one of the structures that play a fundamental role in the musculoskeletal functions. According to this theory, the facial system makes a great contribution to the different functions spreading from head to foot and to the dynamic movements of the body through its ability to move. Hardened and shortened facial tissue (due to recurrent micro trauma or acute injury), loss of functional capacity and pain due to reduced ability to shear. Myofascial relaxation therapy can also restore the mobility and pain sensation in the joints by stretching, loosening to the myofascial tissue. Myofascial relaxation therapy is a combination of manual traction and long stretching maneuvers to open facial adhesions. There are two basic myofascial release techniques, direct and indirect. In the direct relaxation technique, the therapist uses a hand or device to apply slight pressures (for 90-120 seconds) directly on the restricted tissue. The direct technique also includes self myofascial relaxation techniques. In the indirect technique, the myofascial complex is extended for a longer time under less load. With myofascial relaxation, normalization of the morphological and inflammatory responses of fibroblasts injured in the context of recurrent strains is possible.

The aim of this study was to investigate the efficacy of myofascial relaxation and mobilization techniques in the treatment of FMS patients on pain, trigger point number, FMS effect score, spinal mobility, sleep quality, anxiety and depression.