<?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>2221-2434</journal-id>
<journal-title><![CDATA[Revista Finlay]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Finlay]]></abbrev-journal-title>
<issn>2221-2434</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Ciencias Médicas de Cienfuegos. Centro Provincial de información de Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2221-24342021000300265</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El entrenamiento a intervalos de alta intensidad no mejora el balance autonómico en cuarentenas por COVID-19]]></article-title>
<article-title xml:lang="en"><![CDATA[High-intensity Interval Training does not Improve Autonomic Balance in COVID-19 Quarantines]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fuentes Barría]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Urbano Cerda]]></surname>
<given-names><![CDATA[Sebastián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilera Eguía]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vera Aguirre]]></surname>
<given-names><![CDATA[Valentina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Wong]]></surname>
<given-names><![CDATA[Catalina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Facultad de Salud. Universidad Santo Tomás  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Facultad de Medicina. Universidad Católica de la Santísima Concepción  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Escuela de Nutrición y Dietética. Facultad de Ciencias para el Cuidado de la Salud. Universidad San Sebastián  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Facultad de Salud. Universidad del Desarrollo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<volume>11</volume>
<numero>3</numero>
<fpage>265</fpage>
<lpage>271</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2221-24342021000300265&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2221-24342021000300265&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2221-24342021000300265&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Fundamento:  la pandemia de la COVID-19 ha obligado a establecer restricciones de movilidad y confinamientos, cuyo impacto ha generado una drástica disminución del tiempo dedicado a la práctica de actividad física, lo que favorece la inactividad, el sedentarismo, además del riesgo de padecer enfermedades crónicas no transmisibles.  Objetivo:  analizar los efectos de un programa de entrenamiento a intervalos de alta densidad de 4 semanas, dirigido en forma remota sobre la variabilidad del ritmo cardiaco en hombres adultos jóvenes confinados por COVID-19.  Métodos:  se realizó un estudio descriptivo, transversal y comparativo en el que participaron 8 hombres adultos evaluados según índice de masa corporal, método para evaluar la intensidad de la actividad física realizada y el Índice de Calidad de Sueño de Pittsburgh, previa intervención. Se elaboró un programa de entrenamiento a intervalos de alta densidad 30:30 durante 4 semanas, de frecuencia 2 veces por semana durante un periodo de 5 min de duración. Se procedió a registrar la variabilidad cardiaca de baja frecuencia, alta frecuencia, la relación entre ambas y la desviación estándar de la variación instantánea de los intervalos RR (SD1).  Resultados:  se reportaron cambios medios significativos pre y post evaluación en baja frecuencia (p = 0,009; d = 0,18), alta frecuencia (p = 0,009; d = 0,18) y SD1 (p = 0,007; d = 0,18), mientras que en su relación no se reportaron cambios significativos (p = 0,113; d = 0,16).  Conclusión:  4 semanas de realización de un programa de entrenamiento a intervalos de alta densidad no generan adaptaciones agudas sobre el balance autonómico, siendo los valores descriptivos medios reportados un posible predictor crónico del sedentarismo causado por las cuarentenas por COVID-19.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Background: the COVID-19 pandemic has forced the establishment of mobility restrictions and confinements, the impact of which has generated a drastic decrease in the time spent practicing physical activity, which favors inactivity, sedentary lifestyle, in addition to the risk of suffering chronic noncommunicable diseases.  Objective: to analyze the effects of a remotely directed 4-week high-density interval training program on heart rate variability in young adult men confined by COVID-19.  Methods: a descriptive, cross-sectional and comparative study was carried out in which 8 adult men evaluated according to body mass index, a method for evaluating the intensity of physical activity carried out and the Pittsburgh Sleep Quality Index, previous intervention participated. A 30:30 high-density interval training program was developed for 4 weeks, with a frequency of 2 times a week for a period of 5 min duration. Low-frequency and high-frequency cardiac variability, the relationship between the two, and the standard deviation of the instantaneous variation of the RR intervals (SD1) were recorded.  Results: significant pre and post evaluation mean changes were reported in low frequency (p = 0.009; d = 0.18), high frequency (p = 0.009; d = 0.18) and SD1 (p = 0.007; d = 0, 18), while no significant changes were reported in their relationship (p = 0.113; d = 0.16).  Conclusion: 4 weeks of completion of a high-density interval training program do not generate acute adaptations on autonomic balance, the mean descriptive values &#8203;&#8203;reported being a possible chronic predictor of sedentary lifestyle caused by COVID-19 quarantines.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[entrenamiento de intervalos de alta intensidad]]></kwd>
<kwd lng="es"><![CDATA[ejercicio físico]]></kwd>
<kwd lng="es"><![CDATA[aislamiento social]]></kwd>
<kwd lng="es"><![CDATA[conducta sedentaria]]></kwd>
<kwd lng="en"><![CDATA[high-intensivity internal training]]></kwd>
<kwd lng="en"><![CDATA[exercise]]></kwd>
<kwd lng="en"><![CDATA[social isolation]]></kwd>
<kwd lng="en"><![CDATA[sedentary behavior]]></kwd>
</kwd-group>
</article-meta>
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