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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 (<jats:italic>p<\/jats:italic> &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.<\/jats:p>","DOI":"10.1515\/hukin-2015-0158","type":"journal-article","created":{"date-parts":[[2016,4,15]],"date-time":"2016-04-15T21:28:42Z","timestamp":1460755722000},"page":"211-218","source":"Crossref","is-referenced-by-count":33,"title":["The Activity Profile of Young Tennis Athletes Playing on Clay and Hard Courts: Preliminary Data"],"prefix":"10.1515","volume":"50","author":[{"given":"Lucas","family":"Adriano Pereira","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victor","family":"Freitas","sequence":"additional","affiliation":[{"name":"GEAFIT \u2013 Grupos de Estudos das Adapta\u00e7\u00f5es Fisiol\u00f3gicas ao Exerc\u00edcio, Universidade Estadual de Londrina, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felipe","family":"Arruda Moura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcelo","family":"Saldanha Aoki","sequence":"additional","affiliation":[{"name":"School of Arts, Sciences and Humanities, University of S\u00e3o Paulo, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Irineu","family":"Loturco","sequence":"additional","affiliation":[{"name":"NAR \u2013 Nucleus of High Performance in Sport, S\u00e3o Paulo, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F\u00e1bio","family":"Yuzo Nakamura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"374","published-online":{"date-parts":[[2016,4,13]]},"reference":[{"key":"2021040621573964216_j_hukin-2015-0158_ref_001_w2aab3b8d103b1b7b1ab2ab1Aa","doi-asserted-by":"crossref","unstructured":"Aughey RJ. 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