Influence of contextual factors on match running performance of starters and non-starters in elite youth male soccer players.

This study investigated the effects of match location, quality of opposition (classified into: strong [1st to 4th position]; intermediate [5th to 15th position]; weak [16th to 20th position]), and match outcome on the match running performance of starters and non-starters from a top elite Brazilian soccer team. Absolute measures were calculated using total distance, high-speed (19.8-25.2 km·h -1 ), sprinting (≥ 25.2 km·h -1 ), total distance high-acceleration (> 2m·s 2 ) , and deceleration (< -2m·s 2 ) were recorded by GPS units from a sample of young soccer players ( N  = 25) in a total of 17 matches. Relative measures were calculated by dividing absolute measures by the total duration of the matches. Non-starters covered greater total distance ( p  = 0.02), sprinting ( p  = 0.02), high-acceleration and deceleration ( p  = 0.04), sprinting distance relative per minute played ( p  = 0.005), and high-acceleration and deceleration relative per minute played ( p  < 0.001) when the team plays at home, strong opponents, and wins the matches. Starters covered greater total distance in high-speed running ( p  = 0.04), high-acceleration and deceleration ( p  = 0.03), and high-speed running relative per minute played ( p  = 0.04) when the team plays strong opponents and wins the matches. These findings highlight the impact of contextual factors during matches on the locomotor performance of young soccer players.