Investigating Acceleration and Deceleration Patterns in Elite Youth Football: The Interplay of Ball Possession and Tactical Behavior

The main objective of this study was (1) to analyze the patterns of acceleration (Ac) and deceleration (Dec) during football matches in elite youth football, both within and between different segments of the match; and (2) to investigate the impact of ball possession and various playing positions on these acceleration and deceleration patterns. To provide a broader explanatory context, the influence of tactical space management was assessed in terms of depth and width. A descriptive comparative design was used, and data were collected during two friendly matches. Player and ball tracking data were collected using a local positioning system. In the attack phase, differences were obtained in the average Ac (first half: 0.42 +/- 0.06 m<middle dot>s-2, second half: 0.38 +/- 0.07 m<middle dot>s-2; p = 0.021, d = 0.50) and average Dec (first half: -0.44 +/- 0.09 m<middle dot>s-2, second half: -0.36 +/- 0.08 m<middle dot>s-2; p = 0.001, d = 0.84). Wingers in the attack phase obtained higher values in maximum Ac (1.65 +/- 0.65 m<middle dot>s-2; p = 0.007, eta 2 = 0.03), and in the total number of both Ac (68.7 +/- 45.22; p = 0.001, eta 2 = 0.10) and Dec (70.6 +/- 45.70; p = 0.001, eta 2 = 0.10). In the defense phase, full-backs obtained higher values in average Ac (0.53 +/- 0.17 m<middle dot>s-2; p = 0.001, eta 2 = 0.07) and average Dec (-0.49 +/- 0.18 m<middle dot>s-2; p = 0.001, eta 2 = 0.05) and wingers in the total number of Ac (43.9 +/- 27.30; p = 0.001, eta 2 = 0.11) and Dec (43.8 +/- 28.60; p = 0.001, eta 2 = 0.10). In young football players, Ac and Dec do not follow a decreasing end throughout the match, and their behavior is uneven depending on ball possession and the position assigned to the player, with the highest demands on Ac/Dec in winger and full-back positions.