Dutra Pereira, F., W. Oliveira Batista, P. dos Santos Claro Fuly, E. de Drummond Alves Junior, and E. Bezerra da Silva. “Physical Activity and Respiratory Muscle Strength in Elderly: A Systematic Review”. Fisioterapia Em Movimento (Physical Therapy in Movement), vol. 27, no. 1, Sept. 2017, doi:10.1590/0103-5150.027.001.AR01.