<?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>0864-0300</journal-id>
<journal-title><![CDATA[Revista Cubana de Investigaciones Biomédicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Invest Bioméd]]></abbrev-journal-title>
<issn>0864-0300</issn>
<publisher>
<publisher-name><![CDATA[ECIMED]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-03002024000100003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variables biomecánicas del penalti en futbolistas de las categorías sub-12 y sub-17]]></article-title>
<article-title xml:lang="en"><![CDATA[Biomechanical variables of the penalty in U-12 and U-17 football players]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cárdenas Campaña]]></surname>
<given-names><![CDATA[Andrés Sebastián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Siguencia Remache]]></surname>
<given-names><![CDATA[Juan Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arias Cazco]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de las Fuerzas Armadas ESPE  ]]></institution>
<addr-line><![CDATA[ Quito]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>43</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-03002024000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-03002024000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-03002024000100003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción:  El estudio de los patrones del movimiento técnico deportivo implica analizar sus componentes biomecánicos, teniendo en cuenta el carácter multifactorial del rendimiento deportivo.  Objetivo:  Describir la mecánica del movimiento del tiro penalti en futbolistas categorías sub-12 y sub-17.  Métodos:  Estudio cuasi experimental de orden correlativo. Se estudiaron ocho variables biomecánicas: centro de gravedad en sus dos ejes, inclinación corporal, ángulos femorotibial antes del contacto, ángulos femorotibial luego del contacto, velocidad, aceleración y acierto. Se seleccionaron dos grupos independientes de 30 futbolistas del género masculino, se clasificaron por categorías sub-12 y sub-17, y se analizó su rendimiento mediante videoanálisis.  Resultados:  Hubo diferencias significativas a favor de la categoría sub-17 en las variables centro de gravedad en el eje X (p = 0,000), en inclinación corporal (p = 0,000), en velocidad (p = 0,000), y en aceleración y acierto (p = 0,000); y diferencias no significativas en el resto (centro de gravedad eje Y: p = 0,267; ángulos femorotibial antes del contacto: p = 0,459; ángulos femorotibial luego del contacto: p = 0,446; y aciertos: p = 0,226).  Conclusiones:  Todos los rangos promedios sobresalieron en la categoría sub-17, excepto en la variable aciertos, lo que implicó una mayor velocidad y aceleración del pie durante la ejecución del tiro a penal. Sin embargo, la precisión, como componente coordinativo, resultó fundamental en la efectividad del disparo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: The study of the patterns of technical sports movement involves analyzing its biomechanical components, taking into account the multifactorial nature of sports performance.  Objective: To describe the mechanics of the movement of the penalty kick in U-12 and U-17 football players.  Methods: Quasi-experimental study of a correlative order. Eight biomechanical variables were studied: center of gravity in its two axes, body inclination, femorotibial angles before contact, femorotibial angles after contact, speed, acceleration and success. Two independent groups of 30 male footballers were selected, classified by U-12 and U-17 categories, and their performance was analysed through video analysis.  Results: There were significant differences in favor of the sub-17 category in the variables center of gravity on the X axis (p = 0.000), body inclination (p = 0.000), speed (p = 0.000), and acceleration and accuracy (p = 0.000); and non-significant differences in the rest (center of gravity Y-axis: p = 0.267; femorotibial angles before contact: p = 0.459; femorotibial angles after contact: p = 0.446; and correct answers: p = 0.226).  Conclusions: All the average ranges stood out in the U-17 category, except in the variable hits, which implied a greater speed and acceleration of the foot during the execution of the penalty kick. However, accuracy, as a coordinating component, was fundamental in the effectiveness of the shot.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[tiro penalti]]></kwd>
<kwd lng="es"><![CDATA[biomecánica]]></kwd>
<kwd lng="es"><![CDATA[fútbol]]></kwd>
<kwd lng="es"><![CDATA[técnica]]></kwd>
<kwd lng="en"><![CDATA[penalty kick]]></kwd>
<kwd lng="en"><![CDATA[biomechanics]]></kwd>
<kwd lng="en"><![CDATA[football]]></kwd>
<kwd lng="en"><![CDATA[technique]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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