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The aim of this study was to analyze the effects of match location, quality of opposition and match outcome on match running performance according to playing position in a Portuguese professional football team. Twenty-three male professional football players were monitored from eighteen Portuguese Football League matches during the 2019-2020 season. Global positioning system technology (GPS) was used to collect time-motion data. The match running performance was obtained from five playing positions: central defenders (CD), fullbacks (FB), central midfielders (CM), wide midfielders (WM) and forwards (FW). Match running performance was analyzed within specific position and contextual factors using one-way analysis of variance (ANOVA) for repeated measures, standardized (Cohen) differences and smallest worthwhile change. CM and WM players covered significantly greater total distance (F = 15.45, p = 0.000, η 2 = 0.334) and average speed (F = 12.79, p &lt; 0.001, η 2 = 0.294). WM and FB players covered higher distances at high-speed running (F = 16.93, p = 0.000, η 2 = 0.355) and sprinting (F = 13.49; p &lt; 0.001, η 2 = 0.305). WM players covered the highest number of accelerations (F = 4.69, p &lt; 0.001, η 2 = 0.132) and decelerations (F = 12.21, p &lt; 0.001, η 2 = 0.284). The match running performance was influenced by match location ( d = 0.06-2.04; CI: -0.42-2.31; SWC = 0.01-1.10), quality of opposition ( d = 0.13-2.14; CI: -0.02-2.60; SWC = 0.01-1.55) and match outcome ( d = 0.01-2.49; CI: -0.01-2.31; SWC = 0.01-0.35). Contextual factors influenced the match running performance with differential effects between playing positions. This study provides the first report about the contextual influence on match running performance in a Portuguese professional football team. Future research should also integrate tactical and technical key indicators when analyzing the match-related contextual influence on match running performance.

Effects of Match Location, Quality of Opposition and Match Outcome on Match Running Performance in a Portuguese Professional Football Team