Comparisons between low-intensity resistance training with blood flow restriction and high-intensity resistance training on quadriceps muscle mass and strength in elderly - Vechin, Felipe C; Libardi, Cleiton A; Conceição, Miguel S; Damas, Felipe R; Lixandrão, Manoel E; Berton, Ricardo P. B; Tricoli, Valmor Alberto Augusto; Roschel, Hamilton; Cavaglieri, Claudia R; Chacon-Mikahil, Mara Patricia; Ugrinowitsch, Carlos (Journal of Strength and Conditioning Research, 2015)