<?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>1659-097X</journal-id>
<journal-title><![CDATA[MHSalud]]></journal-title>
<abbrev-journal-title><![CDATA[MHSalud]]></abbrev-journal-title>
<issn>1659-097X</issn>
<publisher>
<publisher-name><![CDATA[Escuela de Ciencias del Movimiento Humano y Calidad de Vida, Universidad Nacional]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-097X2022000100029</article-id>
<article-id pub-id-type="doi">10.15359/mhs.19-1.3</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efectos de un protocolo de entrenamiento excéntrico sobre el rendimiento de velocidad en adolescentes de Chile]]></article-title>
<article-title xml:lang="en"><![CDATA[Effects of an eccentric training protocol on speed performance in chilean adolescents]]></article-title>
<article-title xml:lang="pt"><![CDATA[Efeitos de um protocolo de treinamento excêntrico sobre o desempenho de velocidade para adolescentes chilenos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Angulo-Gómez]]></surname>
<given-names><![CDATA[Edgardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernándiz-González]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portes-Junior]]></surname>
<given-names><![CDATA[Moacyr]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Mosqueira]]></surname>
<given-names><![CDATA[Claudio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hermosilla-Palma]]></surname>
<given-names><![CDATA[Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Comunitario de Achao  ]]></institution>
<addr-line><![CDATA[Quinchao, Chiloé ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Pedro de Valdivia Facultad de Educación ]]></institution>
<addr-line><![CDATA[Chillán ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Chile Departamento de Educación Física Grupo de Estudios Educación Física y Salud (EFISAL)]]></institution>
<addr-line><![CDATA[Talca ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Los Lagos  ]]></institution>
<addr-line><![CDATA[Puerto Montt ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Autónoma de Chile Departamento Educación Física ]]></institution>
<addr-line><![CDATA[Temuco ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>19</volume>
<numero>1</numero>
<fpage>29</fpage>
<lpage>40</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-097X2022000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-097X2022000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-097X2022000100029&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  Los beneficios del entrenamiento de fuerza sobre la velocidad de carrera han sido descritos en la bibliografía especializada, sin embargo, la evidencia sobre la influencia de estímulos específicos, basados en contracciones excéntricas sobre la musculatura extensora de cadera, no han sido demostrados.  Objetivo:  Determinar los efectos de un protocolo de entrenamiento basado en contracciones excéntricas (curl nórdico) sobre la velocidad de carrera en 20 metros en adolescentes de la región de Ñuble, Chile.  Metodología: 42 individuos escolares fueron divididos en grupo experimental (n=22) y grupo control (n=20). El entrenamiento se desarrolló durante 6 semanas, con una frecuencia de 2 sesiones/semana, pasando de un volumen de 8 a 32 repeticiones de curl nórdico por sesión para el grupo experimental. El rendimiento de velocidad fue evaluado en 20 metros. La prueba T de Student fue utilizada para comparar los resultados pre y post intervención y se calculó el tamaño del efecto (TE).  Resultados:  Se encontraron diferencias estadísticamente significativas (p&lt;0,05) a partir de la intervención en el grupo experimental (pre= 3,43 s. vs post= 3,15 s.), y un TE grande (1,04).  Conclusión:  Se concluye que el entrenamiento excéntrico basado en la aplicación de Curl nórdico, mejora el rendimiento de la velocidad de carrera.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: The specialized literature has described the benefits of strength training on running speed. In the same way, stimulation of training based on eccentric contractions has been shown to be effective in improving this quality.  Objective: To determine the effects of a training protocol based on the stretch-shortening cycle (SSC) and another on eccentric contractions (Nordic curl) on the running speed in 20 meters in adolescents from the Ñuble Region, Chile.  Methodology: 42 school subjects were divided into experimental group (n = 22) and control group (n = 20). The training was developed for 6 weeks, with a frequency of 2 sessions/week, going from a volume of 8 to 32 repetitions of Nordic curl per session for the experimental group. The speed performance was evaluated in 20 meters. With photocells, the T Student's was applied to compare the pre- and post-intervention results, and the effect size (ES) was calculated.  Results: Statistically significant differences were found (p &lt;0.05) from the intervention in the experimental group (pre= 3,43 s. vs post= 3,15 s.), and a large ES (1,04).  Conclusion: It is concluded that the eccentric training based on the application of Nordic Curl improves the performance of the running speed.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Introdução: Os benefícios do treinamento de força na velocidade de corrida foram descritos na literatura especializada, no entanto, não foram demonstradas evidências sobre a influência de estímulos específicos, baseados em contrações excêntricas na musculatura extensora do quadril.  Objetivo: Determinar os efeitos de um protocolo de treinamento baseado em contrações excêntricas (cacho nórdico) em velocidade de corrida de 20 m em adolescentes da região do Ñuble, Chile.  Metodologia: 42 escolares foram divididos em um grupo experimental (n=22) e um grupo controle (n=20). O treino foi desenvolvido durante 6 semanas, com uma frequência de 2 sessões/semana, passando de um volume de 8 para 32 repetições de ondulação nórdica por sessão para o grupo experimental. O desempenho da velocidade foi avaliado acima de 20 metros. O teste T de Student foi usado para comparar os resultados pré e pós-intervenção e o tamanho do efeito (TE) foi calculado.  Resultados: Foram encontradas diferenças estatisticamente significativas (p&lt;0,05) da intervenção no grupo experimental (pré= 3,43 s. vs pós= 3,15 s.), e um TE grande (1,04).  Conclusão: Conclui-se que o treinamento excêntrico baseado na aplicação do Curl nórdico melhora o desempenho da velocidade de corrida.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Velocidad]]></kwd>
<kwd lng="es"><![CDATA[contracción muscular]]></kwd>
<kwd lng="es"><![CDATA[entrenamiento físico]]></kwd>
<kwd lng="en"><![CDATA[Velocity]]></kwd>
<kwd lng="en"><![CDATA[muscle contraction]]></kwd>
<kwd lng="en"><![CDATA[exercise]]></kwd>
<kwd lng="pt"><![CDATA[Velocidade]]></kwd>
<kwd lng="pt"><![CDATA[contração muscular]]></kwd>
<kwd lng="pt"><![CDATA[treinamento físico]]></kwd>
</kwd-group>
</article-meta>
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