<?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>0212-1611</journal-id>
<journal-title><![CDATA[Nutrición Hospitalaria]]></journal-title>
<abbrev-journal-title><![CDATA[Nutr. Hosp.]]></abbrev-journal-title>
<issn>0212-1611</issn>
<publisher>
<publisher-name><![CDATA[Grupo Arán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0212-16112023000600019</article-id>
<article-id pub-id-type="doi">10.20960/nh.04432</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effects of acute beta-alanine supplementation on post-exertion rating of perceived exertion, heart rate, blood lactate, and physical performance on the 6-minute race test in middle-distance runners]]></article-title>
<article-title xml:lang="es"><![CDATA[Efectos de la suplementación aguda con beta-alanina sobre el índice de esfuerzo percibido, la frecuencia cardíaca y el lactato sanguíneo posesfuerzo, y el rendimiento físico en la prueba de carrera de 6 minutos en corredores de media distancia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barahona-Fuentes]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Huerta-Ojeda]]></surname>
<given-names><![CDATA[Álvaro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galdames-Maliqueo]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yeomans-Cabrera]]></surname>
<given-names><![CDATA[María-Mercedes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jorquera-Aguilera]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Las Américas Núcleo de Investigación en Salud, Actividad Física y Deporte ]]></institution>
<addr-line><![CDATA[Viña del Mar ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Las Américas Facultad de Educación ]]></institution>
<addr-line><![CDATA[Viña del Mar ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Mayor Facultad de Ciencias Escuela de Nutrición y Dietética]]></institution>
<addr-line><![CDATA[Santiago ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2023</year>
</pub-date>
<volume>40</volume>
<numero>5</numero>
<fpage>1047</fpage>
<lpage>1055</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112023000600019&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112023000600019&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112023000600019&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: the use of beta-alanine (BA) to increase physical performance in the heavy-intensity domain zone (HIDZ) is widely documented. However, the effect of this amino acid on the post-exertion rating of perceived exertion (RPE), heart rate (HR), and blood lactate (BL) is still uncertain.  Objectives: a) to determine the effect of acute BA supplementation on post-exertion RPE, HR, and BL in middle-distance athletes; and b) to determine the effect of acute BA supplementation on physical performance on the 6-minute race test (6-MRT).  Material and methods: the study included 12 male middle-distance athletes. The design was quasi-experimental, intrasubject, double-blind &amp; crossover. It had two treatments (low-dose BA [30 mg·kg-1] and high-dose BA [45 mg·kg-1]) and a placebo, 72 hours apart. The effect of BA was evaluated at the end of the 6-MRT and post-exertion. The variables were RPE, HR and BL, and 6-MRT (m) distance. The statistical analysis included a repeated-measures ANOVA (p &lt; 0.05).  Results: the analysis evidenced no significant differences at the end of 6-MRT for all variables (p &lt; 0.05). However, both doses of BA generated a lower post-exertion RPE. The high dose of BA caused significant increases in post-exertion BL (p &lt; 0.05).  Conclusion: acute supplementation with BA generated a lower post-exertion RPE. This decrease in RPE and the post-exertion BL increase could be related to an increase in physical performance in HIDZ.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: el uso de beta-alanina (BA) para aumentar el rendimiento físico en zonas con dominio de alta intensidad (HIDZ) está ampliamente documentado. Sin embargo, el efecto de este aminoácido sobre el índice de esfuerzo percibido (RPE), la frecuencia cardíaca (HR) y el lactato sanguíneo (BL) aún es incierto.  Objetivos: a) determinar el efecto de la suplementación aguda de BA sobre el RPE, la HR y el BL posesfuerzo; y b) además del rendimiento en la prueba de carrera de 6 minutos (6-MRT), en atletas de media distancia.  Material y métodos: el estudio incluyó a 12 atletas masculinos de media distancia. El diseño fue cuasiexperimental, intrasujeto, doble ciego y cruzado. Incluyó dos tratamientos (BA en dosis baja [30 mg·kg-1] y BA en dosis alta [45 mg·kg-1]) y placebo, con 72 horas de diferencia. El efecto de BA se evaluó al final de los 6-MRT y posesfuerzo. Las variables fueron RPE, HR y BL, y distancia en 6-MRT (m). El análisis estadístico incluyó un ANOVA de medidas repetidas (p &lt; 0,05).  Resultados: el análisis no evidenció diferencias significativas al final de los 6-MRT para todas las variables (p &gt; 0,05). Sin embargo, ambas dosis de BA generaron un menor RPE posesfuerzo. La dosis alta de BA generó incrementos significativos en el BL posesfuerzo (p &lt; 0,05).  Conclusión: la suplementación aguda con BA generó un menor RPE posesfuerzo. Esta disminución del RPE y el aumento en el BL posesfuerzo podrían estar relacionados con un aumento del rendimiento físico en HIDZ.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Sports nutrition]]></kwd>
<kwd lng="en"><![CDATA[Amino acid]]></kwd>
<kwd lng="en"><![CDATA[Athletes]]></kwd>
<kwd lng="es"><![CDATA[Nutrición deportiva]]></kwd>
<kwd lng="es"><![CDATA[Aminoácidos]]></kwd>
<kwd lng="es"><![CDATA[Atletas]]></kwd>
</kwd-group>
</article-meta>
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