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During that period, players were classified as elite or sub-elite. To account for the repeated measurements within the individual nature of longitudinal data, multilevel random effects regression analyses were used. Sprint performance improved with age at each additional 1 year of age, thus predicting \u223c.016\u2009sec improvement in five-meter sprint time by all variables of the model. It was possible to predict the performance of elite tennis players in the 5-m sprint (sec) for elite players (1.1493 \u2013 (0.0159\u2009\u010b\u2009centered age) \u2013 (0.009\u2009\u010b\u2009BM) \u2013 (0.044\u2009\u010b\u2009LLES) and sub-elite players (1.1493 \u2013 (0.0159\u2009\u010b\u2009centered age) + 0.0135 \u2013 (0.009\u2009\u010b\u2009BM) \u2013 (0.044\u2009\u010b\u2009LLES) \u2013 (0.0557\u2009\u010b\u2009centered age). Sprint performance differences between elite and sub-elite players was related to longitudinal changes in body size and lower limb strength up until age 13.<\/jats:p>","DOI":"10.1177\/0031512516628367","type":"journal-article","created":{"date-parts":[[2016,2,26]],"date-time":"2016-02-26T01:32:32Z","timestamp":1456450352000},"page":"299-318","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":13,"title":["Modeling Longitudinal Changes in 5\u2009m Sprinting Performance Among Young Male Tennis Players\n                    <sup\/>"],"prefix":"10.1177","volume":"122","author":[{"given":"Tamara","family":"Kramer","sequence":"first","affiliation":[{"name":"HAN Sports and Exercise, HAN University of Applied Sciences, the Netherlands"},{"name":"Center for Human Movement Sciences, University Medical Center Groningen, University of Groningen, the Netherlands"}]},{"given":"Jo\u00e3o","family":"Valente-Dos-Santos","sequence":"additional","affiliation":[{"name":"Portuguese Foundation for Science and Technology (SFRH\/BPD\/100470\/2014), Portugal"},{"name":"Faculty of Physical Education &amp; Sport, Lus\u00f3fona University of Humanities &amp; Technologies, Portugal"},{"name":"Faculty of Sport Sciences &amp; Physical Education, University of Coimbra, Portugal"}]},{"given":"Manuel J.","family":"Coelho-E-Silva","sequence":"additional","affiliation":[{"name":"Faculty of Sport Sciences and Physical Education, University of Coimbra, Portugal"}]},{"given":"Robert M.","family":"Malina","sequence":"additional","affiliation":[{"name":"Department of Kinesiology and Health Education, University of Texas at Austin, USA"}]},{"given":"Barbara C. 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