RT info:eu-repo/semantics/article T1 A random forest approach to explore how situational variables affect perceived exertion of elite youth soccer players A1 Marqués Jiménez, Diego A1 Sampaio, Jaime A1 Calleja González, Julio A1 Echeazarra, Ibon K1 Deportes K1 Deportes Aspecto psicológico K1 Situational variables K1 RPE K1 Soccer K1 Variables situacionales K1 EPR K1 Fútbol K1 6109.07 Evaluación del Rendimiento K1 61 Psicología AB The aim of this study was to explore how situational variables affect youth soccer players’ perceived exertion (RPE) after official matches. Thirty-five elite youth male players (14.33 ± 0.86 years; 173.49 ± 6.16 cm; 63.44 ± 5.98 kg) who belonged to two different teams of a professional club participated in this study. Data collection was conducted during two seasons (2016–2017, 2017–2018) and included 60 official matches (30 official matches per team). Ten minutes after each match players rated their RPE and using a modified Borg CR-10 scale. A Random Forest Regression was used to quantify the importance of match-related situational variables in RPE. Afterwards, a linear mixed model analysis was applied to identify the variability in RPE among the situational variables. The game-playing time, the player status (starter or substitute) and the player identity were the strongest predictors of RPE. Moreover, the match outcome and the final scoreline showed significant effects on both starter and substitute players but the main effect of the quality of the opponent was only identified in starter players (p < 0.05). These results allow practitioners to know how situational variables interact and modulate RPE after official matches and help them to prescribe and adapt the players’ training content and load before and after matches. PB Elsevier SN 1469-0292 YR 2023 FD 2023 LK https://uvadoc.uva.es/handle/10324/63631 UL https://uvadoc.uva.es/handle/10324/63631 LA eng NO Psychology of Sport and Exercise, 2023, vol. 67, 102429 NO Producción Científica DS UVaDOC RD 22-may-2024