<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1659-4436</journal-id>
<journal-title><![CDATA[Pensar en Movimiento: Revista de ciencias del ejercicio y la salud]]></journal-title>
<abbrev-journal-title><![CDATA[Pensar en Movimiento]]></abbrev-journal-title>
<issn>1659-4436</issn>
<publisher>
<publisher-name><![CDATA[Escuela de Educación Física de la Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-44362021000100228</article-id>
<article-id pub-id-type="doi">10.15517/pensarmov.v19i1.44517</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Seasonal changes in the aerobic performance of young soccer players]]></article-title>
<article-title xml:lang="es"><![CDATA[Cambio estacional en el rendimiento aeróbico de jugadores de fútbol jóvenes]]></article-title>
<article-title xml:lang="pt"><![CDATA[Alteração da temporada no desempenho aeróbico de jogadores juvenis de futebol]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Diker]]></surname>
<given-names><![CDATA[Gürkan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zileli]]></surname>
<given-names><![CDATA[Raif]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Özkamç&#305;]]></surname>
<given-names><![CDATA[Hüseyin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ön]]></surname>
<given-names><![CDATA[Sadi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Sivas Cumhuriyet University  ]]></institution>
<addr-line><![CDATA[ Sivas]]></addr-line>
<country>Turquey</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Bilecik &#350;eyh Edebali University  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Turkey</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Dokuz Eylül University  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Turkey</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Ahi Evran University  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Turkey</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>19</volume>
<numero>1</numero>
<fpage>228</fpage>
<lpage>244</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-44362021000100228&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-44362021000100228&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-44362021000100228&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Diker, G., Zileli, R., Özkamç&#305;, H &amp; Ön, S. (2021). Seasonal changes in the aerobic performance of young soccer players. PENSAR EN MOVIMIENTO: Revista de Ciencias del Ejercicio y la Salud, 19(1), 1-16. Longitudinal studies evaluating seasonal changes in the aerobic capacity of young soccer players of different age categories are limited. The aim of this study was to investigate the seasonal changes in the aerobic level of young professional soccer players. This research study included 51 soccer players in the U14, U15, U16, U17, and U18 categories of an elite soccer team. Aerobic capacity in athletes was measured using the Yo-YoIRT 1 Test. In the analyses, normal distribution of data was assessed with the Shapiro-Wilk test, and homogeneity of variance was tested with the Levene&#8217;s Test. A one-way ANOVA test was used to analyze parametric data. All statistical evaluations were conducted with the help of the SPSS 21 software package. According to the Yo-YoIRT 1 test, increases or decreases were determined in the pre-season, mid-season, and end-of-season evaluations. As a result, in the present study conducted to examine the seasonal changes of the young elite soccer players in the U14, U15, U16, U17, and U18 categories, Yo-YoIRT 1 values in all categories increased significantly at the end of the season when compared to the pre-season and the mid-season. U14 and U16 age groups gained increasing acceleration since the pre-season. However, in U15, U17, and U18 age groups, acceleration decreased in the middle of the season and increased at the end of the season. Differences may be observed in the responses to the training loads during maturation. It can be suggested that the increase at the end of the season compared to the pre-season in all groups may be due to the athletes&#8217; adaptation to training programs is affected by the developmental characteristics regarding age categories over time.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Diker, G., Zileli, R., Özkamç&#305;, H y Ön, S. (2021). Cambio estacional en el rendimiento aeróbico de jugadores de fútbol jóvenes. PENSAR EN MOVIMIENTO: Revista de Ciencias del Ejercicio y la Salud, 19(1), 1-16. Los estudios longitudinales que evalúan el cambio estacional en la capacidad aeróbica de los jugadores de fútbol jóvenes de diferentes categorías de edad son limitados. El objetivo de este estudio fue investigar los cambios estacionales del nivel aeróbico de los jugadores de la academia juvenil de un equipo de fútbol profesional. Esta investigación se realizó con un total de 51 futbolistas de las categorías U14, U15, U16, U17 y U18 de un equipo de fútbol de élite. Las capacidades aeróbicas de los atletas se midieron mediante la prueba Yo-YoIRT 1. En los análisis, las evaluaciones de distribución normal de los datos se realizaron con la prueba de Shapiro-Wilk y las homogeneidades de varianza se probaron con la prueba de Levene. Se utilizó la prueba ANOVA de una vía para analizar todos los datos paramétricos; todas las evaluaciones estadísticas se realizaron con la ayuda del programa SPSS 21. De acuerdo con la prueba Yo YoIRT 1, se determinaron aumentos y/o disminuciones en las evaluaciones de pretemporada, mitad de temporada y final de temporada. Como resultado, los sujetos de todas las categorías aumentaron significativamente al final de la temporada en comparación con la pretemporada y la temporada media. Los grupos de edad U14 y U16 lograron una aceleración creciente a partir de la pretemporada. Sin embargo, en los grupos de edad U15, U17, U18, la aceleración disminuye en la mitad de la temporada y aumenta al final de la temporada. Se cree que se pueden observar diferencias en las respuestas a las cargas de entrenamiento durante el crecimiento y la maduración. Se puede sugerir que el incremento al final de la temporada respecto a la pretemporada, en todos los grupos, puede deberse a que la adaptación de los deportistas a los programas de entrenamiento se ve afectada por las características del desarrollo en cuanto a las categorías de edad a lo largo del tiempo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Diker, G., Zileli, R., Özkamç&#305;, H e Ön, S. (2021). Alteração da temporada no desempenho aeróbico de jogadores juvenis de futebol. PENSAR EN MOVIMIENTO: Revista de Ciencias del Ejercicio y la Salud, 19(1), 1-16. Os estudos longitudinais que avaliam a alteração da temporada na capacidade aeróbica dos jogadores juvenis de futebol de diferentes categorias de idade são limitados. Este estudo teve como objetivo pesquisar as alterações da temporada no desempenho aeróbico dos jogadores da academia juvenil de uma equipe de futebol profissional. Esta pesquisa foi realizada com um total de 51 jogadores de futebol das categorias U14, U15, U16, U17 e U18 de uma equipe de futebol de elite. As capacidades aeróbicas dos atletas foram medidas por meio do teste Yo-YoIRT1. Nas análises, as avaliações de distribuição normal dos dados foram realizadas com o teste de Shapiro-Wilk e as homogeneidades de variância foram aprovadas com o teste de Levene. Foi utilizado o teste ANOVA de uma via para analisar todos os dados paramétricos; todas as avaliações estatísticas foram realizadas com a ajuda do programa SPSS 21. De acordo com o teste Yo-YoIRT1, foram determinados aumentos e/ou reduções nas avaliações de pré- temporada, meio de temporada e final de temporada. Como resultado, os sujeitos de todas as categorias aumentaram significativamente no final da temporada em comparação com a pré- temporada e meados da temporada. Os grupos de idade U14 e U16 conseguiram uma aceleração crescente a partir da pré-temporada. Porém, nos grupos de idade U15, U17, U18, a aceleração diminui no meio da temporada e aumenta no final da temporada. Acredita-se que possam ser observadas diferenças nas respostas às cargas de treinamento durante o crescimento e a maturação. É possível sugerir que o aumento no final da temporada em relação à pré-temporada, em todos os grupos, deve-se ao fato de que a adaptação dos esportistas aos programas de treinamento se vê afetada pelas características do desenvolvimento no que diz respeito às categorias de idade ao longo do tempo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[aerobic capacity]]></kwd>
<kwd lng="en"><![CDATA[yo-yoIRT1]]></kwd>
<kwd lng="en"><![CDATA[soccer.]]></kwd>
<kwd lng="es"><![CDATA[capacidad aeróbica]]></kwd>
<kwd lng="es"><![CDATA[yo-yoIRT 1]]></kwd>
<kwd lng="es"><![CDATA[fútbol.]]></kwd>
<kwd lng="pt"><![CDATA[capacidade aeróbica]]></kwd>
<kwd lng="pt"><![CDATA[yo-yoIRT1]]></kwd>
<kwd lng="pt"><![CDATA[futebol.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bangsbo]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Iaia]]></surname>
<given-names><![CDATA[F.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Krustrup]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The Yo-Yo intermittent recovery test.]]></article-title>
<source><![CDATA[Sports Medicine]]></source>
<year>2008</year>
<volume>38</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>37-51</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Baxter-Jones]]></surname>
<given-names><![CDATA[A.D.G.]]></given-names>
</name>
<name>
<surname><![CDATA[Helms]]></surname>
<given-names><![CDATA[P.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of training at a young age: A review of the training of young athletes (TOYA) study]]></article-title>
<source><![CDATA[Pediatric Exercise Science]]></source>
<year>1996</year>
<volume>8</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>310-27</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Brito]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Malina]]></surname>
<given-names><![CDATA[R.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Seabra]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Massada]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<name>
<surname><![CDATA[Soares]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Krustrup]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Rebelo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Injuries in Portuguese youth soccer players during training and match play]]></article-title>
<source><![CDATA[Journal of Athletic Training]]></source>
<year>2012</year>
<volume>47</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>191-7</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Caldwell]]></surname>
<given-names><![CDATA[B.P.]]></given-names>
</name>
<name>
<surname><![CDATA[Peters]]></surname>
<given-names><![CDATA[D.M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seasonal variation in physiological fitness of a semiprofessional soccer team]]></article-title>
<source><![CDATA[Journal of Strength and Conditioning Research]]></source>
<year>2009</year>
<volume>23</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>1370-7</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Charalampos]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Zisis]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Asterios]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Nikolaos]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Comparison of two physical conditioning programs in improving aerobic endurance in moderately trained youth amateur soccer players during the preparation period.]]></article-title>
<source><![CDATA[Journal of Physical Education and Sport]]></source>
<year>2013</year>
<volume>13</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>419-24</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dragijsky]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Maly]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Zahalka]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Kunzmann]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Hank]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seasonal variation of agility, speed and endurance performance in young elite soccer players]]></article-title>
<source><![CDATA[Sports]]></source>
<year>2017</year>
<volume>5</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-8</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Edwards]]></surname>
<given-names><![CDATA[A.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Clark]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Macfadyen]]></surname>
<given-names><![CDATA[A. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Lactate and ventilatory thresholds reflect the training status of professional soccer players where maximum aerobic power is unchanged]]></article-title>
<source><![CDATA[Journal of Sports Science and Medicine]]></source>
<year>2003</year>
<volume>2</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>23-9</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Emmonds]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Sawczuk]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Scantlebury]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Till]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Jones]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seasonal changes in the physical performance of elite youth female soccer players]]></article-title>
<source><![CDATA[Journal of Strength and Conditional Research]]></source>
<year>2020</year>
<volume>34</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>2636-43</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fanchini]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Castagna]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Coutts]]></surname>
<given-names><![CDATA[A.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Schena]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[McCallf]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Impellizzeri]]></surname>
<given-names><![CDATA[FM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Are the Yo-Yo intermittent recovery test levels 1 and 2 both useful? Reliability, responsiveness and interchangeability in young soccer players]]></article-title>
<source><![CDATA[Journal of Sports Sciences]]></source>
<year>2014</year>
<volume>32</volume>
<numero>20</numero>
<issue>20</issue>
<page-range>1950-195</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hammami]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Ben Abderrahmane]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Nebigh]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Le Moal]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Ben Ounis]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Tabka]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Zouhal]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of a soccer season on anthropometric characteristics and physical fitness in elite young soccer players]]></article-title>
<source><![CDATA[Journal of Sports Sciences]]></source>
<year>2013</year>
<volume>31</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>589-96</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Haritonidis]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Koutlianos]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Koudi]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Haritonidou]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Deligiannis]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seasonal variation of aerobic capacity in elite soccer, basketball and volleyball players.]]></article-title>
<source><![CDATA[Journal of Human Movement Studies]]></source>
<year>2004</year>
<volume>46</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>289-302</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Helgerud]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Engen]]></surname>
<given-names><![CDATA[L.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Wisløff]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Hoff]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Aerobic endurance training improves soccer performance]]></article-title>
<source><![CDATA[Medicine &amp; Science in Sports &amp; Exercise]]></source>
<year>2001</year>
<volume>33</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>1925-31</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hill]]></surname>
<given-names><![CDATA[A.P.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Perfectionism and burnout in junior soccer players: A test of the 2 x 2 model of dispositional perfectionism]]></article-title>
<source><![CDATA[Journal of Sport &amp; Exercise Psychology]]></source>
<year>2013</year>
<volume>35</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>18-29</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hopkins]]></surname>
<given-names><![CDATA[W.G.]]></given-names>
</name>
<name>
<surname><![CDATA[Marshall]]></surname>
<given-names><![CDATA[S.W.]]></given-names>
</name>
<name>
<surname><![CDATA[Batterham]]></surname>
<given-names><![CDATA[A.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Hanin]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Progressive statistics for studies in sports medicine and exercise science]]></article-title>
<source><![CDATA[Medicine &amp; Science in Sports &amp; Exercise]]></source>
<year>2009</year>
<volume>41</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>3-12</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hoshikawa]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Kanno]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Ikoma]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Muramatsu]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Iida]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Uchiyama]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Nakajima]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[Off season and preseason changes in total and regional body composition in Japanese professional soccer league players]]></source>
<year>2005</year>
<conf-name><![CDATA[ World congress on science and soccer]]></conf-name>
<conf-loc> </conf-loc>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Impellizzeri]]></surname>
<given-names><![CDATA[F.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Marcora]]></surname>
<given-names><![CDATA[S.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Castagna]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Reilly]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Sassi]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Iaia]]></surname>
<given-names><![CDATA[F.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Rampinini]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Physiological and performance effects of generic versus specific aerobic training in soccer players.]]></article-title>
<source><![CDATA[International Journal of Sports Medicine]]></source>
<year>2006</year>
<volume>27</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>483-92</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jastrz&#281;bski]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Dargiewicz]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Ignatiuk]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Radzimi&#324;ski]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Rompa]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Konieczna]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Lactate threshold changes in soccer players during the preparation period]]></article-title>
<source><![CDATA[Baltic Journal of Health and Physical Activity]]></source>
<year>2011</year>
<volume>3</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>96-10</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jastrz&#281;bski]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Barnat]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Konieczna]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Rompa]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Radzimi&#324;ski]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Physical capacity and soccer-related skills in young soccer players with in a one-year period]]></article-title>
<source><![CDATA[Baltic Journal of Health and Physical Activity]]></source>
<year>2011</year>
<volume>3</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>248-61</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kraemer]]></surname>
<given-names><![CDATA[W.J.]]></given-names>
</name>
<name>
<surname><![CDATA[French]]></surname>
<given-names><![CDATA[D.N.]]></given-names>
</name>
<name>
<surname><![CDATA[Paxton]]></surname>
<given-names><![CDATA[N.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Hakkinen]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Volek]]></surname>
<given-names><![CDATA[J.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Sebastianelli]]></surname>
<given-names><![CDATA[W.J. &#8230;]]></given-names>
</name>
<name>
<surname><![CDATA[Knuttgen]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Changes in exercise performance and hormonal concentrations over a big ten soccer season in starters and nonstarters]]></article-title>
<source><![CDATA[Journal of Strength Conditional Research]]></source>
<year>2004</year>
<volume>18</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>121-8</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Malina]]></surname>
<given-names><![CDATA[R.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Peña Reyes]]></surname>
<given-names><![CDATA[M.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Eisenmann]]></surname>
<given-names><![CDATA[J.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Horta]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodrigues]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Miller]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Height, mass and skeletal maturity of elite Portuguese soccer players aged 11-16 years]]></article-title>
<source><![CDATA[Journal of Sports Sciences]]></source>
<year>2000</year>
<volume>18</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>685-93</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[McMillan]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Helgerud]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Grant]]></surname>
<given-names><![CDATA[S.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Newell]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Wilson]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Macdonald]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Hoff]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Lactate threshold responses to a season of professional British youth soccer]]></article-title>
<source><![CDATA[British Journal of Sports Medicine]]></source>
<year>2005</year>
<volume>39</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>432-6</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mohr]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Krustrup]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Bangsbo]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Physiological characteristics and exhaustive exercise performance of elite soccer players during a season]]></article-title>
<source><![CDATA[Medicine &amp; Science in Sports &amp; Exercise]]></source>
<year>2002</year>
<volume>34</volume>
<numero>5</numero>
<issue>5</issue>
</nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mohr]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Krustrup]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Bangsbo]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Match performance of high-standard soccer players with special reference to development of fatigue.]]></article-title>
<source><![CDATA[Journal of Sports Sciences]]></source>
<year>2003</year>
<volume>21</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>519-28</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mohr]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Krustrup]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Yo-Yo intermittent recovery test performances within an entire soccer league during a full season.]]></article-title>
<source><![CDATA[Journal of Sports Sciences]]></source>
<year>2014</year>
<volume>32</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>315-27</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Morris]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Emmonds]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Jones]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Myers]]></surname>
<given-names><![CDATA[T.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Clarke]]></surname>
<given-names><![CDATA[N.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Lake]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Ellis]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Singleton]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Roe]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Till]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seasonal changes in physical qualities of elite youth soccer players according to maturity status: comparisons with aged matched controls]]></article-title>
<source><![CDATA[Science and Medicine in Soccer]]></source>
<year>2018</year>
<volume>2</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>272-80</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reilly]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Williams]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Science and Soccer]]></source>
<year>2003</year>
<edition>2nd</edition>
<publisher-loc><![CDATA[London ]]></publisher-loc>
<publisher-name><![CDATA[Routledge]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Roe]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Malone]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Yo-Yo intermittent recovery test performance in subelite Gaelic soccer players from under thirteen to senior age groups]]></article-title>
<source><![CDATA[The Journal of Strength and Conditioning Research]]></source>
<year>2016</year>
<volume>30</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>3187-93</page-range></nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sagelv]]></surname>
<given-names><![CDATA[E.H.]]></given-names>
</name>
<name>
<surname><![CDATA[Selnæs]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Pedersen]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Pettersen]]></surname>
<given-names><![CDATA[S.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Randers]]></surname>
<given-names><![CDATA[M.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Welde]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of linear versus changes of direction repeated sprints on intermittent high intensity running performance in high-level junior soccer players over an entire season: A randomized Trial.]]></article-title>
<source><![CDATA[Sports]]></source>
<year>2019</year>
<volume>7</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>189</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sæther]]></surname>
<given-names><![CDATA[S.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Aspvik]]></surname>
<given-names><![CDATA[N.P]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seasonal variation in objectively assessed physical activity among young Norwegian talented soccer players: A description of daily physical activity level.]]></article-title>
<source><![CDATA[Journal of Sports Science and Medicine]]></source>
<year>2014</year>
<volume>13</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>964-8</page-range></nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[J.F.]]></given-names>
</name>
<name>
<surname><![CDATA[Nakamura]]></surname>
<given-names><![CDATA[F.Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Carminatti]]></surname>
<given-names><![CDATA[L.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Dittrich]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Cetolin]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Guglielmo]]></surname>
<given-names><![CDATA[L.G.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The effect of two generic aerobic interval training methods on laboratory and field test performance in soccer players]]></article-title>
<source><![CDATA[Journal of Strength and Conditioning Research]]></source>
<year>2015</year>
<volume>29</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>1666-72</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sylejmani]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Maliqi]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Gontarev]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Haziri]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Morina]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Durmishaj]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Bajrami]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Anthropometric characteristics and physical performance of young elite Kosovo soccer players]]></article-title>
<source><![CDATA[International Journal of Morphology]]></source>
<year>2019</year>
<volume>37</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>1429-36</page-range></nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Teixeira]]></surname>
<given-names><![CDATA[A.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Da Silva]]></surname>
<given-names><![CDATA[J.F.]]></given-names>
</name>
<name>
<surname><![CDATA[Carminatti]]></surname>
<given-names><![CDATA[L.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Dittrich]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Castagna]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Guglielmo]]></surname>
<given-names><![CDATA[L.G.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Reliability and validity of the Carminatti&#8217;s test for aerobic fitness in youth soccer players]]></article-title>
<source><![CDATA[The Journal of Strength and Conditioning Research]]></source>
<year>2014</year>
<volume>28</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>3264-73</page-range></nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Teplan]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Maly]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Zahalka]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Hrasky]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Mala]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Heller]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The level and differences of aerobic capacity in three different young soccer teams in the U17 category]]></article-title>
<source><![CDATA[Sport Science]]></source>
<year>2012</year>
<volume>5</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>43&#8208;48</page-range></nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Thomas]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Dawson]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Goodman]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The yo-yo test: reliability and association with a 20-m shuttle run and VO(2max).]]></article-title>
<source><![CDATA[International Journal of Sports Physiology and Perform]]></source>
<year>2006</year>
<volume>1</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>137-49</page-range></nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vanttinen]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Blomqvist]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Nyman]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Hakkinen]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Changes in body composition, hormonal status and physical &#64257;tness in 11, 13 and 15 year old Finnish regional youth soccer players during a two year follow-up.]]></article-title>
<source><![CDATA[The Journal of Strength and Conditioning Research]]></source>
<year>2011</year>
<volume>25</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>3342-51</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
