Changes in the Autonomous Nervous System and in the cranio-facial pain threshold after applying visceral manual therapy in patients with chronic migraine and functional gastrointestinal disorders.

The objective is to assess the changes produced by manual visceral treatment in a homogeneous group of patients with chronic migraine and functional gastrointestinal disorders. These changes produced will be measured at the level of the Autonomous Nervous System (heart rate variability), in cervical mobility, sensitive threshold and in the pressure pain threshold on the sutural cranial point, a neural point (Valleix supraorbital neural point ) and a muscular trigger point (upper fibers of the Trapezius muscle) after performing manual visceral techniques on the diaphragm and some gastrointestinal areas. The hypothesis is that visceral manual maneuvers should have influence on craneofacial pain by modulating the autonomic nervous system