Resumen de The Relationship Between Maximal Repetition Performance and Muscle Fiber Type as Estimated by Noninvasive Technique in the Quadriceps of Untrained Women
Peter C. Douris, Benjamin P. White, Robert R. Cullen, William E. Keltz, John Meli
Douris, P.C., B.P. White, R.R. Cullen, W.E. Keltz, J. Meli, D.M. Mondiello, and D. Wenger. The relationship between maximal repetition performance and muscle fiber type as estimated by noninvasive technique in the quadriceps of untrained women. J. Strength Cond. Res. 20(3):699-703. 2006.-The purpose of this investigation was to establish a relationship between the number of repetitions an individual can complete at a predetermined load and their percentage of type II muscle fibers in their quadriceps. Subjects included 22 untrained women between the ages of 18 and 35. Day 1 consisted of noninvasive anthropologic testing, 1 repetition maximum (1RM) testing, and recording repetition performance at 70% 1RM. Day 2 consisted of isokinetic dynamometry to determine muscle fiber composition. Results were obtained and analyzed using the Pearson product correlation coefficient (r). The results demonstrated a fair-to-moderate relationship (Pearson r = ?0.48, p = 0.02) that individuals with greater percentages of type II muscle fibers performed fewer repetitions at 70% 1RM. The results of this study demonstrate that muscle fiber type composition is an important variable to consider when designing training or rehabilitation programs
