<?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>1665-1146</journal-id>
<journal-title><![CDATA[Boletín médico del Hospital Infantil de México]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Med. Hosp. Infant. Mex.]]></abbrev-journal-title>
<issn>1665-1146</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud, Hospital Infantil de México Federico Gómez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-11462020000100015</article-id>
<article-id pub-id-type="doi">10.24875/bmhim.19000139</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Differences in blood pressure according to physical fitness and body mass in a sample of Mexican schoolchildren]]></article-title>
<article-title xml:lang="es"><![CDATA[Diferencias en la presión sanguínea de acuerdo con la condición física y masa corporal en una muestra de escolares mexicanos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayala-Guzmán]]></surname>
<given-names><![CDATA[César I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez Cruz]]></surname>
<given-names><![CDATA[Lilia G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-Hernández]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Metropolitana Departamento de Atención a la Salud ]]></institution>
<addr-line><![CDATA[Xochimilco Ciudad de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2020</year>
</pub-date>
<volume>77</volume>
<numero>1</numero>
<fpage>15</fpage>
<lpage>22</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462020000100015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462020000100015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462020000100015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Physical fitness is the ability to perform activities of daily living without excessive fatigue. The potential protective role of fitness against high blood pressure in childhood is relevant to diminish the risk of hypertension in adulthood. A negative association between cardiorespiratory fitness (CRF) and hypertension has been found in the pediatric population. However, the role of body mass as a confounding variable of this association has not been evaluated. This study aimed to analyze whether the association between fitness and blood pressure in Mexican schoolchildren is independent of body mass.  Methods: A cross-sectional study was conducted with a sample of 1010 children (574 females and 436 males) aged 9-12 years (mean age = 10.3 ± 0.9 years) from 13 elementary schools in Mexico City. Fitness was evaluated with tests from the FitnessGram® battery. Z-scores of body mass index (BMI)-for-age and height-for-age were estimated.  Results: Low fitness showed a high prevalence (from 45.8% for trunk lift to 77.5% for push-ups). Children with poor CRF (assessed by the 20-m progressive aerobic cardiovascular endurance run test) and upper body strength (assessed by push-ups) showed a higher probability of hypertension (p &lt; 0.05). However, these differences disappeared after adjusting for BMI.  Conclusions: After considering the body mass, cardiorespiratory and musculoskeletal fitness were not independent predictors of blood pressure.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: La condición física es la habilidad de realizar actividades de la vida diaria sin fatiga excesiva. El potencial papel protector de una buena condición física contra la presión arterial elevada es relevante, ya que, si no se atiende, esta elevación en la presión arterial comúnmente conduce a hipertensión en la vida adulta. Se ha documentado una asociación negativa entre la condición cardiorrespiratoria con la hipertensión de la población pediátrica. Sin embargo, no se ha evaluado el papel de la masa corporal como una variable de confusión de esta asociación. El objetivo de este estudio fue evaluar si la asociación entre la condición física y la presión sanguínea es independiente de la masa corporal en escolares mexicanos.  Métodos: Estudio transversal con una muestra de 1010 escolares (574 de sexo femenino y 436 de sexo masculino) de 9 a 12 años (edad promedio = 10.3 ± 0.9 años) de 13 escuelas de primaria de la Ciudad de México. La condición física se evaluó con la batería FitnessGram®. Se estimaron puntuaciones Z del índice de masa corporal (IMC) para la edad.  Resultados: La prevalencia de baja condición física fue alta (de 45.8% en la prueba de levantamiento de tronco a 77.5% en la prueba de lagartijas). Los escolares con baja condición cardiorrespiratoria (evaluada con la carrera progresiva de resistencia cardiovascular aeróbica de 20 m) y fuerza superior del cuerpo (evaluada con la prueba de lagartijas) mostraron una mayor probabilidad de presentar hipertensión (p &lt; 0.05). Sin embargo, estas diferencias desaparecieron al ajustar por el IMC.  Conclusiones: Después de considerar la masa corporal, la condición cardiorrespiratoria y musculoesquelética no son predictores independientes de la presión sanguínea.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cardiorespiratory fitness]]></kwd>
<kwd lng="en"><![CDATA[Body mass index]]></kwd>
<kwd lng="en"><![CDATA[Blood pressure]]></kwd>
<kwd lng="en"><![CDATA[Muscular fitness]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="es"><![CDATA[Condición cardiorrespiratoria]]></kwd>
<kwd lng="es"><![CDATA[Índice de masa corporal]]></kwd>
<kwd lng="es"><![CDATA[Presión sanguínea condición musculoesquelética]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
</kwd-group>
</article-meta>
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