57 JEPonline Influence of Different Speeds of Muscle Actions in the Maximum Dynamic Strength, in the Maximum Volume of Repetitions, and Rated Perceived Exertion Hiago L. R. de Souza 1 , Yuri A. C. Campos 1,2 , Osvaldo C. Moreira 1,3,4 , Miller P. Guimarães 1,5 , Gaspar P. Silva 1,5 , Sandro F. da Silva 1 1 Studies Research Group in Neuromuscular Responses (GEPRE, University of Lavras, Lavras, Brazil, 2 Postgraduate of the FAEFID, University of Juiz de Fora, Juiz de Fora, Brazil, 3 Institute of Biomedicine, University of León, León, España, 4 Institute of Biological Science and Health, University of Viçosa, Florestal, Brazil, 5 University of Pedro de Valdivia, Chillan, Chile ABSTRACT Souza HLR, Campos YAC, Moreira OC, Guimarães MP, Silva GP, Silva SF. Influence of Different Speeds of Muscle Actions in the Maximum Dynamic Strength, in the Maximum Volume of Repetitions, and Rated Perceived Exertion. JEPonline 2016;19(1): 57-65. The purpose of this study was to investigate the influence of different speeds of muscle action on the maximum volume of repetitions (MVR), rated perceived exertion (RPE), and maximum dynamic muscle strength of 9 women. At the end of 3 series of each execution, protocol was added the MVR, and collected the RPE, the maximum dynamic strength was assessed 72 hrs after each protocol. The results showed no statistically significant differences in RPE, maximum number of repetitions, and maximum dynamic strength among the three protocols: concentric protocol (CP); eccentric protocol (EP); and control protocol (CoP). This study does not support the earlier observations of a decrease in the maximal contraction strength with eccentric protocols. Also, in regards to RPE, there were no statistically significant differences at the end of the execution of the 3 sets in the three different protocols analyzed. Key Words: Resistance training, Eccentric actions, Hypertrophy Journal of Exercise Physiologyonline February 2016 Volume 19 Number 1 Editor-in-Chief Tommy Boone, PhD, MBA Review Board Todd Astorino, PhD Julien Baker, PhD Steve Brock, PhD Lance Dalleck, PhD Eric Goulet, PhD Robert Gotshall, PhD Alexander Hutchison, PhD M. Knight-Maloney, PhD Len Kravitz, PhD James Laskin, PhD Yit Aun Lim, PhD Lonnie Lowery, PhD Derek Marks, PhD Cristine Mermier, PhD Robert Robergs, PhD Chantal Vella, PhD Dale Wagner, PhD Frank Wyatt, PhD Ben Zhou, PhD Official Research Journal of the American Society of Exercise Physiologists ISSN 1097-9751 Official Research Journal of the American Society of Exercise Physiologists ISSN 1097-9751