Comparison of different ways of expressing creatine kinase concentration of soccer players during a competitive season oleh Daniel Barbosa Coelho, Christian Emmanuel Torres Cabido, Victor Augusto Lemos Ciminelli, Leonardo Gomes Martins Coelho, Lenice Kapes Becker, Emerson Cruz de Oliveira, Emerson Rodrigues Pereira, João Carlos Bouzas Marins, Emerson Silami Garcia