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- Contextual analysis of physical-tactical match performance Contextual analysis of physical-tactical match performance demands in elite U21 soccer playersPublication . Craig Davies; Vassallo, Christian; Ryan, Ben; Zmijewski, Piotr; Oliveira, Rafael; Teixeira, José Eduardo; Moreira, Alexandre; Morgans, RylandBackground: Soccer matches include physical and tactical factors, yet limited research has integrated physical-tactical variables involving U21 soccer players. This study examined how different phases of play influence physical intensity in elite U21 soccer players. Materials and Methods: Twelve professional development league matches involving 29 male U21 soccer players (106 obser vations) were analysed. Players wore 10 Hz GPS units to derive relative (m/min) physical metrics during six phases of play. Phases and positions were compared using repeated‑measures ANOVA and one‑way ANOVA. Results: Players covered significantly greater high-speed running per mi nute (HSR/min) during the final third compared to build-up (p = 0.015, ES: 0.5, small) and progres sion phases (p = < 0.001, ES: 0.6, moderate). Furthermore, players covered significantly greater HSR/min during the defensive low block phase compared to build-up (p = 0.001, ES: 0.7, moderate), progression (p = < 0.001, ES: 0.9, moderate), middle block (p = 0.011, ES: 0.7, moderate) and high press (p = 0.001, ES: 0.8, moderate) phases. Conclusions: Differing phases of play required specific physical qualities depending on the position and the tactical role within the team. This integrated approach provides contextualisation of important physical metrics relevant to tactical actions that may inform training design and rehabilitation sessions.