<?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>S1665-11462017000400272</article-id>
<article-id pub-id-type="doi">10.1016/j.bmhimx.2017.02.006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El auto-reporte de actividad física y comportamientos sedentarios no concuerda con la acelerometría en escolares mexicanos]]></article-title>
<article-title xml:lang="en"><![CDATA[Accelerometry does not match with self-reported physical activity and sedentary behaviors in Mexican children]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayala-Guzmán]]></surname>
<given-names><![CDATA[César Iván]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Ibáñez]]></surname>
<given-names><![CDATA[Norma]]></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 Unidad Xochimilco  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<volume>74</volume>
<numero>4</numero>
<fpage>272</fpage>
<lpage>281</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462017000400272&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462017000400272&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462017000400272&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  La evaluación precisa de la actividad física (AF) en escolares es necesaria para implementar estrategias que favorezcan estilos de vida activos. El objetivo del presente estudio fue evaluar la validez de un cuestionario autoadministrado de AF y actividades sedentarias y ligeras (ASL) desarrollado para escolares mexicanos, analizando las diferencias en la validez de acuerdo con el estado de nutrición.  Métodos:  Escolares de 8-12 años de edad contestaron un cuestionario autoaplicable en el cual se evaluaron las ASL y AF moderada y vigorosa (AFMV). Se determinaron los minutos a la semana dedicados a ASL y AFMV en niños que portaron un acelerómetro triaxial. La concordancia entre los dos métodos para detectar el tiempo que los niños invierten en ver televisión se evaluó mediante coeficientes de correlación intraclase y el método de Bland-Altman.  Resultados:  La estimación de AFMV por cuestionarios fue mayor que la de acelerometría por 117.6 min/semana, mientras que la estimación de ASL fue menor por 1,924.7 min/semana. No se detectó correlación entre el tiempo evaluado con acelerómetros y el reportado en el cuestionario para las ASL y AFMV. En niños con índice de masa corporal normal, se detectó una correlación baja entre el tiempo reportado y el medido por acelerometría para jugar videojuegos con las actividades sedentarias (ric = 0.29, p = 0.031).  Conclusiones:  Los escolares sobreestiman las AFMV y subestiman las ASL. El peso corporal puede ser un factor que influya en dichos sesgos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background:  An accurate assessment of physical activity in schoolchildren is necessary to implement strategies that promote active lifestyles. The objective of this study was to validate a self-administered questionnaire to assess physical activity and sedentary behaviors and to analyze differences in the validity according to nutritional status in Mexican schoolchildren.  Methods:  Schoolchildren of 8-12 years of age answered a self-report physical activity and sedentary behaviors questionnaire to evaluate sedentary and light physical activity (SLPA) and moderate to vigorous physical activity (MVPA). The data of children who wore a triaxial accelerometer days was analyzed. Concordance between both methods to determine the time schoolchildren spend watching television was assessed using intraclass correlation coefficients and Bland-Altman method.  Results:  The estimation of MVPA by questionnaires was higher than that of accelerometers by 117.6 minutes per week, and the estimation of SLPA was lower by 1,924.7 minutes per week. No correlation between the time assessed by accelerometers and the time reported in the questionnaires for SLPA and MVPA was detected. In normal-weighted children, a low correlation between the time dedicated to play videogames with sedentary activities (ric =0.29, p=0.031) assessed by accelerometers was observed.  Conclusions:  Schoolchildren over-estimate MVPA and under-estimate SLPA. Body weight can be a factor influencing such bias.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Niños]]></kwd>
<kwd lng="es"><![CDATA[Cuestionario]]></kwd>
<kwd lng="es"><![CDATA[Actividad física]]></kwd>
<kwd lng="es"><![CDATA[Estilo de vida sedentario]]></kwd>
<kwd lng="es"><![CDATA[Validez]]></kwd>
<kwd lng="es"><![CDATA[Acelerometría]]></kwd>
<kwd lng="en"><![CDATA[Children]]></kwd>
<kwd lng="en"><![CDATA[Questionnaire]]></kwd>
<kwd lng="en"><![CDATA[Physical activity]]></kwd>
<kwd lng="en"><![CDATA[Sedentary lifestyle]]></kwd>
<kwd lng="en"><![CDATA[Validity]]></kwd>
<kwd lng="en"><![CDATA[Accelerometry]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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