<?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>1659-097X</journal-id>
<journal-title><![CDATA[MHSalud]]></journal-title>
<abbrev-journal-title><![CDATA[MHSalud]]></abbrev-journal-title>
<issn>1659-097X</issn>
<publisher>
<publisher-name><![CDATA[Escuela de Ciencias del Movimiento Humano y Calidad de Vida, Universidad Nacional]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-097X2025000100144</article-id>
<article-id pub-id-type="doi">10.15359/mhs.22-1.18195</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Longitudinal Changes In Objectively Measured Physical Activity, Sedentary Behavior And Sleep In Spanish Adolescents]]></article-title>
<article-title xml:lang="es"><![CDATA[Evolución objetiva de los niveles de actividad física, comportamiento sedentario y sueño en adolescentes españoles]]></article-title>
<article-title xml:lang="pt"><![CDATA[Mudanças Longitudinais na Atividade Física, Comportamento Sedentário e Sono Medidos Objetivamente em Adolescentes Espanhóis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Argüelles]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cecchini Estrada]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Río]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Oviedo  ]]></institution>
<addr-line><![CDATA[Oviedo Asturias]]></addr-line>
<country>España</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Oviedo  ]]></institution>
<addr-line><![CDATA[Oviedo Asturias]]></addr-line>
<country>España</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Oviedo  ]]></institution>
<addr-line><![CDATA[Oviedo Asturias]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<volume>22</volume>
<numero>1</numero>
<fpage>144</fpage>
<lpage>165</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-097X2025000100144&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-097X2025000100144&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-097X2025000100144&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Longitudinal evidence on the evolution of physical activity (PA), sedentary behavior and sleep in adolescents is still scarce, especially in Spanish contexts.  Purpose:  The present study aimed to assess the wakefulness movement and sleep progression from early to mid-adolescence with 24-hours accelerometry.  Methods:  Participants included 229 adolescents (123 males, 106 females) aged 13 to 15 years (13.28 ± .57) from a city in the north of Spain. Three repeated measures were taken in 3 consecutive years. PA, sedentary behavior and sleep variables were measured using ActiGraph GT3x accelerometers over a full week. Anthropometric measures were taken to obtain BMI and socioeconomic status was assessed with a validated questionnaire. Statistical analyses included linear mixed models.  Results:  Data showed that sedentary behavior and vigorous PA increased over time, whereas light PA, moderate PA and energy expenditure decreased. Both total sleep time and sleep efficiency decreased, whereas sleep onset and offset were delayed.  Conclusions:  Over the 3-year period, adolescents worsened in most of the variables analyzed. The decrease in both PA and sleep variables could have short- and long-term implications for their health, resulting in pathologies such as obesity, hypertension, cardiovascular disease, joint pain, among others. These findings highlight the need to develop both PA and sleep interventions during adolescence.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  Existe escasa evidencia longitudinal sobre los niveles de actividad física (AF), comportamiento sedentario y sueño en la adolescencia, especialmente en el contexto español.  Objetivo:  Observar la evolución del movimiento en vigilia y del sueño desde la adolescencia temprana a la media empleando acelerometría las 24 horas del día.  Metodología:  Participaron 229 adolescentes (123 hombres, 106 mujeres) de entre 13 y 15 años (13.28 ± .57) de una ciudad del norte de España. Se tomaron tres medidas repetidas a lo largo de tres años consecutivos. La AF, el comportamiento sedentario y el sueño fueron medidos con acelerómetros ActiGraph GT3x durante una semana completa. Se tomaron medidas antropométricas para el cálculo del IMC, mientras que el nivel socioeconómico se evaluó mediante un cuestionario previamente validado. Para el análisis sed realizaron modelos lineales mixtos.  Resultados:  Se observó que el comportamiento sedentario y la AF vigorosa se incrementaron, mientras que la AF ligera, la AF moderada y el gasto energético descendieron. Tanto la duración de sueño como su eficiencia disminuyeron, mientras que el inicio y el fin de sueño se retrasaron.  Conclusiones:  Tras 3 años, los adolescentes empeoraron en la mayoría de las variables estudiadas. Esta merma tanto en las variables de AF como en las de sueño, puede tener implicaciones a corto y a largo plazo en su salud, manifestándose en patologías como obesidad, hipertensión, enfermedad cardiovascular, dolores articulares, entre otras. Estos hallazgos confirman la necesidad de llevar a cabo intervenciones para la mejora de la AF y el sueño en la adolescencia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Introdução:  A evidência longitudinal sobre a evolução da atividade física (AF), comportamento sedentário e sono em adolescentes ainda é escassa, especialmente em contextos espanhóis.  Objetivo:  O presente estudo teve como objetivo avaliar a progressão da movimentação durante a vigília e do sono desde o início até a meia adolescência, utilizando acelerometria de 24 horas.  Métodos:  Os participantes incluíram 229 adolescentes (123 do sexo masculino, 106 do sexo feminino) com idades entre 13 e 15 anos (13,28 ± 0,57) de uma cidade no norte da Espanha. Foram realizadas três medições repetidas ao longo de 3 anos consecutivos. As variáveis de AF, comportamento sedentário e sono foram medidas utilizando acelerômetros ActiGraph GT3x durante uma semana inteira. Medições antropométricas foram feitas para calcular o IMC e o status socioeconômico foi avaliado com um questionário validado. As análises estatísticas incluíram modelos mistos lineares.  Resultados:  Os dados mostraram que o comportamento sedentário e a AF vigorosa aumentaram ao longo do tempo, enquanto a AF leve, a AF moderada e o gasto energético diminuíram. Tanto o tempo total de sono quanto a eficiência do sono diminuíram, enquanto o início e o fim do sono foram retardados.  Conclusões:  Ao longo do período de 3 anos, os adolescentes apresentaram piora na maioria das variáveis analisadas. A diminuição tanto da atividade física quanto das variáveis de sono pode ter implicações de curto e longo prazo para sua saúde, resultando em patologias como obesidade, hipertensão, doenças cardiovasculares, dores nas articulações, entre outras. Esses achados destacam a necessidade de desenvolver intervenções tanto para a AF quanto para o sono durante a adolescência.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[physical activity]]></kwd>
<kwd lng="en"><![CDATA[sleep]]></kwd>
<kwd lng="en"><![CDATA[adolescents]]></kwd>
<kwd lng="es"><![CDATA[actividad física]]></kwd>
<kwd lng="es"><![CDATA[sueño]]></kwd>
<kwd lng="es"><![CDATA[adolescentes]]></kwd>
<kwd lng="pt"><![CDATA[atividade física]]></kwd>
<kwd lng="pt"><![CDATA[sono]]></kwd>
<kwd lng="pt"><![CDATA[adolescentes]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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