How does a change of coach affect the physical performance of football players?

The present study analysed the conditional manifestation of a semi-professional football team when it underwent a change of coach. The results showed external load data extracted from global positioning devices (GPS) in two periods of the season-regular league and permanence phase-, where it could be observed that the change of coach affected the physical performance of the team, as it was significantly higher in HSR Rel Dist (m) (t 348.26 = 2.72; p =.007; d =.27), HSR Rel Count (t 352.85 = 2.72; p =.007; d =.27), Sprints REL (t 260.9 = 2.12; p =.003; d =.28), HMLD (m/min) (t 156.69 = 7.07; p <.001; d =.74) and > 24 m/min (t 354 = 2.16; p =.031; d =.23) with the first coach's work methodology. However, in the variables Distance (m) (t 186.65 = 2.5; p =.013; d =.29) and Player Load (t 188.94 = 2.63; p =.015; d =.29), higher values were obtained with the new coach. There was, therefore, no relevant variation and improvement in the data with the new coach, indicating that a team's performance was due to multiple factors and that more running did not guarantee a higher collective performance in terms of scoring success.