<?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>0026-1742</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina (México)]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Med. (Méx.)]]></abbrev-journal-title>
<issn>0026-1742</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0026-17422015000300013</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efectos fisiológicos en un ambiente de microgravedad]]></article-title>
<article-title xml:lang="en"><![CDATA[Physiological effects in an environment of microgravity]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo Esper]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz Ponce Medrano]]></surname>
<given-names><![CDATA[Juan Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peña Pérez]]></surname>
<given-names><![CDATA[Carlos Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores Rivera]]></surname>
<given-names><![CDATA[Oscar Iván]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz Trujillo]]></surname>
<given-names><![CDATA[Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortés Antonio]]></surname>
<given-names><![CDATA[Osvaldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz de Jesús]]></surname>
<given-names><![CDATA[Joel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez Saucedo]]></surname>
<given-names><![CDATA[Luis Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Escuela Médico Naval  ]]></institution>
<addr-line><![CDATA[ DF]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Sociedad de Medicina del Espacio y Microgravedad  ]]></institution>
<addr-line><![CDATA[ DF]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Escuela Médico Naval  ]]></institution>
<addr-line><![CDATA[ DF]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Escuela Médico Naval  ]]></institution>
<addr-line><![CDATA[ DF]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Escuela Médico Naval  ]]></institution>
<addr-line><![CDATA[ DF]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2015</year>
</pub-date>
<volume>58</volume>
<numero>3</numero>
<fpage>13</fpage>
<lpage>24</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0026-17422015000300013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0026-17422015000300013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0026-17422015000300013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En el siglo veinte, el estudio del universo y el desarrollo de los vuelos espaciales fueron posibles gracias al avance tecnológico de naves de propulsión por diferentes tipos de cohetes. Muchos sistemas biológicos se afectan en los vuelos espaciales y se ha demostrado que en un ambiente de microgravedad se altera de manera significativa la función musculoesquelética, neurosensitiva, endócrina, renal, respiratoria y cardiovascular, además del riesgo de lesión debido a la exposición a diferentes tipos de radiación, eventos que comprometen la salud y rendimiento de los astronautas. Por lo anterior es fundamental mantener la salud y acondicionamiento físico de los astronautas durante el vuelo espacial para facilitar y acelerar su recuperación al llegar a la tierra.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Until the twentieth century, study about the universe and speculation about the nature of spaceflight were no closely related to the technical developments that led to rocket propulsión. Many biological systems are adversely affected by space flight and It has been shown that exposure to microgravity can alter the musculoskeletal, neurosensory, endocrine, renal, respiratory and cardiovascular systems and the risk of injury due to radiation exposure resulting in deconditioning that may compromise astronauts health and performance. Maintainig health and fitness during space missions is critical for preserving performance during misión specific tasks and to optimize terrestrial recovery.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Espacio]]></kwd>
<kwd lng="es"><![CDATA[microgravedad]]></kwd>
<kwd lng="es"><![CDATA[vuelos espaciales]]></kwd>
<kwd lng="en"><![CDATA[Space]]></kwd>
<kwd lng="en"><![CDATA[microgravidity]]></kwd>
<kwd lng="en"><![CDATA[space flight]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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