The purpose of this work was to evaluate if the vastus medialis oblique (VMO) muscle had greater electrical activity than the vastus lateralis longus (VLL) muscle during exercises of maximal resistence isometric contraction (MRIC) and maximal resistence isotonic contraction (MRIsotC) performed in Leg-Press (VITALLY). The electrical activity of the VMO and VLL muscles was investigate in 12 adult volunteers no sedentary (X= 21.9; SD= 1.16), without prior hip, knee and ankle pathologies, using a 16-channel Electromyographic System and program of Data Aquisition (Digital Analogue Conversor - CAD 12/36 - 60K - AqDados 4.6 - LYNX Tecnologia Eletrônica Ltda) and differential surface electrodes (DELSYS Inc.). The electromyographic records were meas...