<?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>2954-3835</journal-id>
<journal-title><![CDATA[Cardiovascular and metabolic science]]></journal-title>
<abbrev-journal-title><![CDATA[Cardiovasc. metab. sci]]></abbrev-journal-title>
<issn>2954-3835</issn>
<publisher>
<publisher-name><![CDATA[Asociación Nacional de Cardiólogos de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2954-38352019000400126</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Autonomic tone modulation and night shift work: a prospective study in medical residents in Medellin, Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Modulación de tono autonómico y trabajo en turno de noche: un estudio prospectivo en residentes médicos en Medellín, Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Patiño]]></surname>
<given-names><![CDATA[Helber Gonzalo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Niño-Pulido]]></surname>
<given-names><![CDATA[César Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vásquez-Trespalacios]]></surname>
<given-names><![CDATA[Elsa María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aristizábal-Aristizábal]]></surname>
<given-names><![CDATA[Julián Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Duque-Ramírez]]></surname>
<given-names><![CDATA[Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad CES  Departamento de Electrofisiología]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad CES Department of Epidemiology ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>30</volume>
<numero>4</numero>
<fpage>126</fpage>
<lpage>135</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2954-38352019000400126&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2954-38352019000400126&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2954-38352019000400126&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Aim:  To evaluate alterations in hear rate variability (HRV), repolarization, and cardiac rhythms in medical residents working night shifts in Medellin, Colombia, by using Holter monitoring as an indirect, non-invasive measure of autonomic tone.  Material and methods:  This was a descriptive, observational study, in which 48-hour Holter monitoring parameters were evaluated and compared in medical residents before, during, and after working night shifts. Data were analysed in four 12-hour periods: period 1: night before night shift or 24 to 12 hours before night shift initiation; period 2: day of night shift (12 hours before night shift initiation); period 3: during night shift work (12 shift hours); and period 4: 12 hours post-shift. A total of 52 residents of clinical and surgical residency programs were included in this study. Mean age was 28 years, 59.6% were female, and 77% were enrolled in public universities. At total of 45 hours of Holter monitoring data per resident were recorded and analysed. Heart rate variability decreased significantly (p &lt; 0.0001) during period 2 (day of night shift), with an additional -yet less pronounced- decrease during period 3 (night shift work).  Conclusions:  Medical residents working the night shifts exhibited a decrease in HRV during periods 2 (before shift) and 3 (during shift), being more evident during period 2 (anticipatory phenomenon). This change in HRV is due to decreased in parasympathetic activity, however remaining within the normal range. Future additional studies are required in order to determine the long-term effects of HRV variation.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Objetivo:  Evaluar en residentes médicos que hacen turnos nocturnos la presencia de alteraciones en la variabilidad de la frecuencia cardiaca (HRV), repolarización y ritmo, a través de monitoreo Holter como medida no invasiva del tono autonómico en Medellín, Colombia.  Material y métodos:  Se realizó un estudio observacional, descriptivo, que evalúa y compara los parámetros del Holter antes, durante y después de la realización de los turnos nocturnos, en residentes de Medellín. Se dividieron las 48 horas en cuatro periodos: periodo 1 (noche anterior al turno o 24 horas antes del turno hasta 12 horas antes del turno); periodo 2 (día del turno o 12 horas antes del turno hasta iniciar el turno); periodo 3 (durante el turno o guardia o 12 horas del turno) y periodo 4 (12 horas post-turno). Se incluyeron 52 residentes con edad promedio de 28 años y 45 horas de registro. El 59.6% eran mujeres, 77% eran de universidad pública y se incluyeron áreas clínicas y quirúrgicas. La variabilidad de la frecuencia cardiaca se redujo significativamente (p &lt; 0.0001) en el periodo 2, con una reducción adicional (menos pronunciada) al iniciar el turno (periodo 3).  Conclusiones:  Los residentes que realizan turnos nocturnos presentan reducción de la variabilidad de la frecuencia cardiaca durante los periodos 2 y 3, siendo más evidente en el periodo 2 (fenómeno de anticipación), este cambio en la variabilidad se debe a disminución de la actividad parasimpática, pero oscila dentro del rango de la normalidad. Se requieren más estudios para definir el impacto de estos hallazgos a largo plazo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Heart rate variability]]></kwd>
<kwd lng="en"><![CDATA[autonomic tone]]></kwd>
<kwd lng="en"><![CDATA[Holter monitoring]]></kwd>
<kwd lng="en"><![CDATA[night shift]]></kwd>
<kwd lng="en"><![CDATA[arrhythmias]]></kwd>
<kwd lng="es"><![CDATA[Variabilidad de la frecuencia cardiaca]]></kwd>
<kwd lng="es"><![CDATA[tono autonómico]]></kwd>
<kwd lng="es"><![CDATA[monitoreo Holter]]></kwd>
<kwd lng="es"><![CDATA[trabajo nocturno]]></kwd>
<kwd lng="es"><![CDATA[arritmias]]></kwd>
</kwd-group>
</article-meta>
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