It is being understood that technical and tactical qualities are the most important values for a football player, anyway during the last years the physical performance became crucial to determinate the result of a game. Normally, the physiological component is a discrimination that permit to differentiate between professional and amateur player. But what are the real differences between an “Over 20 years old” and a “Under 20 years old” player, evaluated in amateur context which parameters emerge to determine the level of an athlete and which elements are crucial to move on to senior category. The performance parameters data collection, has been possible through the use of GPS (Global Position System). In our case were analyzed 6 matches in First Category championship (Marche, Italy), corresponding at the seventh level of Italian league and 6 games of the Juniors Provincial championship (Marche, Italy), using 10 GPS, 5 for each team, each divided into positions, to give larger specificity to the study. Afterward data were analyzed, dividing two control groups, substituted players (outgoing) calling them "Full Match Sub" and players who have played the entire game, calling them "Full Match".
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