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The aim of this study was to compare the kinematic characteristics of tennis matches between red clay and hard courts in young tennis players. Eight young tennis players performed two tennis matches on different court surfaces. The match activities were monitored using GPS units. The distance covered in different velocity ranges and the number of accelerations were analyzed. The paired t test and inference based on magnitudes were used to compare the match physical performance between groups. The total distance (24% of difference), high-intensity running distance (15 - 18 km/h) (30% of difference), the number of high-intensity activities (44% of difference), the body load (1% of difference), and accelerations &gt;1.5 g (1.5-2 g and &gt;2 g 7.8 and 8.1 % of difference, respectively) were significantly greater in clay court than hard court matches ( p &lt; 0.05). Matches played on the red clay court required players to cover more total and high-intensity running distances and engage in more high-intensity activities than the matches played on the hard court. Finally, on the clay court the body load and the number of accelerations performed (&gt;1.5 g) were possibly higher than on the hard court.

The Activity Profile of Young Tennis Athletes Playing on Clay and Hard Courts: Preliminary Data