<?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>0120-2448</journal-id>
<journal-title><![CDATA[Acta Medica Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Med Colomb]]></abbrev-journal-title>
<issn>0120-2448</issn>
<publisher>
<publisher-name><![CDATA[Asociacion Colombiana de Medicina Interna]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-24482016000200130</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El eje hipotálamo-pituitaria-adrenal (HPA) al envejecer Cortisol salival en ancianos]]></article-title>
<article-title xml:lang="en"><![CDATA[The hypothalamic pituitary adrenal axis (HPA) in aging Salivary cortisol in the elderly]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Curcio]]></surname>
<given-names><![CDATA[Carmen-Lucía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Benjumea]]></surname>
<given-names><![CDATA[Ángela-María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Caldas Facultad de Ciencias para la Salud Departamento Clínico]]></institution>
<addr-line><![CDATA[Manizales ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>41</volume>
<numero>2</numero>
<fpage>130</fpage>
<lpage>137</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-24482016000200130&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-24482016000200130&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-24482016000200130&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: el Cortisol salival ha sido frecuentemente utilizado como un marcador de estrés. El cortisol tiene un importante ritmo diurno con elevaciones pico en las horas de madrugada, denominada respuesta del cortisol al despertar (RCD) con una caída durante el día. Los cambios al envejecer en el eje hipotálamo-pituitaria-adrenal (HPA) son contradictorios.  Objetivo: este estudio examina la variación diurna de los niveles de cortisol salival en sujetos ancianos que viven en la comunidad.  Diseño: estudio trasversal descriptivo.  Medio: Poblacional. Participantes del estudio IMIAS (International Mobility in Aging Study).  Participantes: cuatrocientos cincuenta personas mayores de 65 años, hombres y mujeres con una submuestra (100) para la toma de cortisol salival.  Mediciones: los participantes recolectaron diez muestras de saliva, cinco por día, durante dos días así: al levantarse, 30 minutos (media hora) después de despertarse, una hora después de despertarse, en la tarde a las 3 pm y al acostarse. El cortisol fue evaluado mediante radioinmunoanálisis enzimático. Se evaluaron RCD, el área bajo la curva y la curva de patrón diurno.  Resultados: se encontró una RCD amputada con un perfil diurno aplanado y con los niveles más bajos en la noche. El patrón de curva encontrado se considera como un patrón "normal" de ritmo circadiano de cortisol al envejecer, que se caracteriza por tener una baja RCD y con una caída lenta a través del día.  Conclusiones: los ancianos muestran una menor respuesta del cortisol al despertar con un ritmo diurno reducido probablemente implicando una regulación alterada del eje HPA con el envejecimiento. (Acta Med Colomb 2016; 41:130-137).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: salivary cortisol has been frequently used as a marker of stress. Cortisol has an important diurnal rhythm with peak elevations at the dawn hours, called cortisol awakening response (CAR) with a drop during the day. Aging changes in the hypothalamic pituitary adrenal (HPA) axis are contradictory.  Objective: this study examines the diurnal variation of salivary cortisol levels in elderly subjects living in the community.  Design: a descriptive cross-sectional study.  Medium: populational. Participants of IMIAS study (International Mobility in Aging Study).  Participants: four hundred and fifty people over 65, men and women with a subsample (100) for the sampling of salivary cortisol.  Measurements: participants collected ten saliva samples, five per day, for two days in this way: when getting up, 30 minutes (half an hour) after waking up, an hour after waking up, in the afternoon at 3 pm and at bedtime. Cortisol was assessed by enzyme radioimmunoassay. CAR, the area under the curve and the curve of diurnal pattern were evaluated.  Results: an amputee CAR with a flattened diurnal profile and lower levels at night was found. Curve pattern found is considered a "normal" pattern of circadian rhythm of cortisol aging, characterized by having a low CAR and a slow fall throughout the day.  Conclusions: The elderly have a lower cortisol response to awakening with a reduced diurnal rhythm probably involving an altered HPA axis regulation with aging. (Acta Med Colomb 2016; 41: 130-137).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cortisol salival]]></kwd>
<kwd lng="es"><![CDATA[envejecimiento]]></kwd>
<kwd lng="es"><![CDATA[cambios relacionados con la edad]]></kwd>
<kwd lng="es"><![CDATA[ritmo circadiano]]></kwd>
<kwd lng="en"><![CDATA[salivary cortisol]]></kwd>
<kwd lng="en"><![CDATA[aging]]></kwd>
<kwd lng="en"><![CDATA[age-related changes]]></kwd>
<kwd lng="en"><![CDATA[divinal rhythm]]></kwd>
</kwd-group>
</article-meta>
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