The main aim of this study was to describe the Ratings of Perceived Exertion (RPE) during the final championship of Guipuzkoa (Spain), in under-12 basketball players and its relation to workload. It was a transversal descriptive study. It was realized whit 150 basketball players. Since instrument for the withdrawal of the PSE was in use the pictorial scale of Eston and Parfitt (2007). The players expressed on having finished every period of party disputed of individualized form and in a pictorial scale the RPE. A RPE was obtained by period of participation with which there was calculated the average RPE of every player in the game. There was realized a descriptive analysis of the PSE and an analysis of multiple regression by steps using as independent variables the years of sports practice, the years of Minibasket's practice (under-12 category), the number of annual sessions, the number of weekly sessions and the duration of the training sessions. There was obtained an average RPE of the game of 4.48 ± 1.65, not being significant differences based on gender (p > .05). The results indicated that the boys begin significantly before that the girls to the Minibasket, though the girls train more annual and weekly training sessions (p <.01). The predictive model reflected that five obtained variables explained 32 % of the variability observed in the average RPE of the games (R2 = .32; F = 30.82; p = .00). The specific training in Minibasket, the number of training and weekly sessions and the duration of the sessions are predictors of a minor RPE in the players
