Early adaptations to six weeks of non-periodized and periodized strength training regimens in recreational males - Souza, Eduardo Oliveira; Ugrinowitsch, Carlos; Tricoli, Valmor Alberto Augusto; Roschel, Hamilton; Lowery, Ryan P; Aihara, André Y; Leão, Alberto R. S; Wilson, Jacob M (Journal of Sports Science and Medicine, 2014)