“…In different studies, Muro-Culebras and Cuesta-Vargas used sono-myography and sono-myoelastography to measure trigger-point tissue stiffness, while Karayol and Sibel used Shear Wave Elastography to measure tissue elasticity in rhomboid major muscles. However, in this study, SEL was used, and has been proven to be a useful and reliable technique to measure tissue properties [ 6 , 27 , 28 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. In addition, SEL measurement was performed, adhering to the proper protocol, on the characteristic Myofascial Trigger Points present in subjects with FM [ 28 ].…”