da Gama, Alana Elza Fontes, et al. “Assessment and Data Processing Tools of Inspiratory Muscle Fatigue Evaluation Using Surface Electromyography: A Systematic Review”. Journal of Respiratory and CardioVascular Physical Therapy, vol. 2, no. 1, Apr. 2014, pp. 3-10, https://periodicos.ufrn.br/revistadefisioterapia/article/view/5062.