<?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>2183-5985</journal-id>
<journal-title><![CDATA[Acta Portuguesa de Nutrição]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Port Nutr]]></abbrev-journal-title>
<issn>2183-5985</issn>
<publisher>
<publisher-name><![CDATA[Associação Portuguesa de Nutrição]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2183-59852021000200064</article-id>
<article-id pub-id-type="doi">10.21011/apn.2021.2512</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[INFLUÊNCIA DA SUPLEMENTAÇÃO DE SUMO DE BETERRABA NA MELHORIA DA PERFORMANCE EM ATLETAS DE CROSSFIT]]></article-title>
<article-title xml:lang="en"><![CDATA[INFLUENCE OF BEETROOT JUICE SUPPLEMENTATION ON PERFORMANCE IMPROVEMENT IN CROSSFIT ATHLETES]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Curado]]></surname>
<given-names><![CDATA[Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Faria]]></surname>
<given-names><![CDATA[Ana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Loureiro]]></surname>
<given-names><![CDATA[Helena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Escola Superior de Tecnologias da Saúde de Coimbra  ]]></institution>
<addr-line><![CDATA[Coimbra ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>06</month>
<year>2021</year>
</pub-date>
<numero>25</numero>
<fpage>64</fpage>
<lpage>68</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S2183-59852021000200064&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S2183-59852021000200064&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S2183-59852021000200064&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO  INTRODUÇÃO:  O CrossFit é uma prática desportiva predominantemente intermitente de alta intensidade e com uma forte componente de endurance. No sentido de melhorar a performance, o sumo de beterraba é um dos alimentos que tem sido amplamente utilizado como suplemento alimentar, no sentido de melhorar a performance. Várias investigações têm demonstrado melhorias na performance em modalidades que envolvam exercícios de endurance intensos e em exercícios de força e potência. Isto deve-se ao seu conteúdo em nitratos cuja evidência científica sugere apresentarem efeitos benéficos ao nível da vasodilatação, aumento do fluxo sanguíneo para as fibras musculares e promoção de trocas gasosas e regulação da eficiência da fosforilação oxidativa, para além de promoverem rápida recuperação muscular.  OBJETIVOS:  O presente artigo de revisão tem por objetivos perceber quais são as variáveis da performance (força, potência ou endurance) influenciadas pelo sumo de beterraba, bem como as diferenças entre suplementação crónica ou aguda. METODOLOGIA: Foi realizada pesquisa bibliográfica, nas bases de dados SCIELO e PUBMED, usando como critérios de inclusão: artigos publicados a partir de 2012 e redigidos em português ou inglês. Foram excluídos artigos cuja amostra era constituída por crianças ou idosos, realizados in vitro ou em animais, estudos em que não foram determinados os efeitos diretos do sumo de beterraba e em que não tenha sido reconhecida credibilidade académica.  RESULTADOS:  A análise dos estudos revela a inconsistência de resultados em relação à influência do nitrato dietético nas várias componentes que influenciam a performance.  CONCLUSÕES:  Sendo o CrossFit um exercício físico de minutos, no qual cada variável pode fazer a diferença, a utilização de nitratos em indivíduos responsivos, pode ser uma mais valia, apesar de não ter ficado comprovada a sua eficácia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  INTRODUCTION:  CrossFit is a predominantly intermittent sport of high intensity and with a strong endurance component. For this reason, beet juice is one of the foods that has been widespread as a supplement to improve performance. Several investigations had results in modalities that involve resistance exercises, strength and power exercises. This is due to its content in nitrates that have beneficial effects in vasodilation, increasing blood flow to the muscle fibers and promoting gas exchange and regulation of the efficiency of oxidative phosphorylation, in addition to promoting rapid muscle recovery.  OBJECTIVES:  This review article aims to understand what are the performance variables (strength, power or endurance) influenced by the beet juice, as well as the differences between chronic or acute supplementation.  METHODOLOGY:  Bibliographic research was carried out in the SCIELO and PUBMED databases, using as inclusion criteria: articles published since 2012 and written in Portuguese or English. Articles whose sample were children or elderly, performed in vitro or in animals, studies in which the direct effects of beet juice were not determined and in which academic credibility has not been recognized, were excluded.  RESULTS:  The analysis of the studies reveals the inconsistency of results regarding the influence of dietary nitrate on the various components that influence performance.  CONCLUSIONS:  CrossFit is a physical exercise of minutes, in which each variable can make a difference, therefore the use of nitrates in responsive individuals can be an asset, although its effectiveness has not been proven.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Sumo de beterraba]]></kwd>
<kwd lng="pt"><![CDATA[Nitratos]]></kwd>
<kwd lng="pt"><![CDATA[Performance]]></kwd>
<kwd lng="pt"><![CDATA[CrossFit]]></kwd>
<kwd lng="pt"><![CDATA[Treino intermitente de alta intensidade]]></kwd>
<kwd lng="en"><![CDATA[Beetroot juice]]></kwd>
<kwd lng="en"><![CDATA[Nitrates]]></kwd>
<kwd lng="en"><![CDATA[Performance]]></kwd>
<kwd lng="en"><![CDATA[CrossFit]]></kwd>
<kwd lng="en"><![CDATA[High-intensity Intermittent training]]></kwd>
</kwd-group>
</article-meta>
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