Blasco, E., V. Lizondo, L. Berbel, and J. Martín. “Study With Surface Electromyography, Borg Scale and Rom Upper Trapezius, Deltoid of the Three Portions (clavicular, Acromial, Spinal) and the Latissimus Dorsi Muscle, before and After Using a Muscle Activation Technique (mat)”. Journal of Human Sport and Exercise, vol. 11, no. 2, Mar. 2017, pp. 329-37, doi:10.14198/jhse.2016.112.06.