<?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>2183-8453</journal-id>
<journal-title><![CDATA[Revista Portuguesa de Saúde Ocupacional online]]></journal-title>
<abbrev-journal-title><![CDATA[RPSO]]></abbrev-journal-title>
<issn>2183-8453</issn>
<publisher>
<publisher-name><![CDATA[Ajeogene Serviços Médicos Lda]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2183-84532025000200305</article-id>
<article-id pub-id-type="doi">10.31252/rpso.13.09.2025</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[TRABALHO POR TURNOS, SÍNDROME METABÓLICA E RISCO CARDIOVASCULAR: UMA REVISÃO SOBRE OS IMPACTOS DA DESREGULAÇÃO CIRCADIANA NA SAÚDE OCUPACIONAL]]></article-title>
<article-title xml:lang="en"><![CDATA[SHIFT WORK, METABOLIC SYNDROME AND CARDIOVASCULAR RISK: A REVIEW ON THE IMPACTS OF CIRCADIAN DYSREGULATION ON OCCUPATIONAL HEALTH]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Brandão]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gonçalves]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernandes]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pinheiro]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,USF Dunas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,USF Joane  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,USF Pró-Saúde  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,USF Dunas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2025</year>
</pub-date>
<volume>20</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S2183-84532025000200305&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S2183-84532025000200305&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S2183-84532025000200305&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO  Introdução e objetivo: O trabalho por turnos, especialmente noturno e rotativo, é cada vez mais frequente em setores como saúde, transportes e indústria, levantando preocupações relevantes em saúde ocupacional. A desregulação dos ritmos circadianos compromete a homeostase do organismo, promovendo alterações hormonais, metabólicas e cardiovasculares. Esta revisão teve como objetivo analisar a evidência publicada entre 2020-2025 sobre a associação entre trabalho por turnos, síndrome metabólica e as doenças cardiovasculares, explorando os mecanismos fisiopatológicos subjacentes e discutindo implicações práticas para a saúde ocupacional.  Metodologia: Foi realizada uma revisão narrativa da literatura com pesquisa nas bases de dados Medline (via PubMed), Scielo e Cochrane em abril de 2025. Foram incluídos artigos publicados em português e inglês entre 2020-2025. Revisões sistemáticas e narrativas foram consideradas como fontes secundárias. Estudos clássicos anteriores foram usados apenas para enquadramento conceptual. A qualidade da evidência foi avaliada segundo a escala Strength of Recommendation Taxonomy (SORT).  Resultados: Foram inicialmente identificados 38 artigos, dos quais 10 cumpriram os critérios de inclusão e foram analisados. A evidência aponta para risco acrescido de Síndroma Metabólica (OR ~1,5) e Doença Cardiovascular (RR ~1,2), com prevalência global até 33% em motoristas profissionais. Estudos longitudinais revelaram uma relação dose-resposta em exposições &#8805;10 anos e diferenças de género, com risco aumentado em mulheres. Os principais desfechos incluíram obesidade abdominal, hipertensão, dislipidemia, resistência à insulina e maior incidência de eventos cardiovasculares. A Síndroma Metabólica foi definida de forma variável, segundo critérios do National Cholesterol Education Program - Adult Treatment Panel III, International Diabetes Federation e da Organização Mundial de Saúde. Para além da síntese internacional, esta revisão articula os resultados com investigações nacionais publicadas na Revista Portuguesa de Saúde Ocupacional, reforçando a relevância prática destes achados no contexto português.  Discussão e Conclusão: A evidência sugere que o trabalho por turnos é um fator de risco modificável para Síndroma Metabólica e Doença Cardiovascular, mediado por cronodisrupção e alterações hormonais e comportamentais. Apesar da consistência dos achados, limitações metodológicas (como predominância de estudos transversais, dados autorrelatados e heterogeneidade nas definições de turno) comprometem a generalização. Futuras coortes de longa duração devem adotar métricas padronizadas e integrar avaliação circadiana objetiva. Do ponto de vista ocupacional, recomenda-se rastreio periódico de indicadores cardiometabólicos, promoção de sono e estilos de vida saudáveis e adaptação dos turnos de acordo com o cronotipo individual, para potenciar a satisfação laboral e produtividade.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction and objective: Shift work, particularly night and rotating shifts, is increasingly common in sectors such as healthcare, transportation and industry, raising significant occupational health concerns. Circadian rhythm disruption compromises homeostasis, leading to hormonal, metabolic, and cardiovascular alterations. This review aimed to analyze evidence published between 2020-2025 on the association between shift work, metabolic syndrome, and cardiovascular diseases, exploring underlying pathophysiological mechanisms and discussing practical implications for occupational health.  Methodology: A narrative literature review was conducted through searches in Medline (via PubMed), Scielo, and Cochrane in April 2025. Articles published in Portuguese and English between 2020-2025 were included. Systematic and narrative reviews were considered as secondary sources. Earlier landmark studies were used only for conceptual framework. Evidence quality was assessed using the Strength of Recommendation Taxonomy.  Results: A total of 38 articles were identified, of which 10 met inclusion criteria. Evidence indicates an increased risk of Metabolic Syndrome (OR ~1.5) and Cardiovascular Diseases (RR ~1.2), with prevalence up to 33% among professional drivers. Longitudinal studies reported a dose-response relationship in exposures &#8805;10 years and gender differences, with higher risk among women. Main outcomes included abdominal obesity, hypertension, dyslipidemia, insulin resistance, and higher incidence of cardiovascular events. Metabolic Syndrome was defined variably, according to National Cholesterol Education Program- Adult Treatment Panel III, International Diabetes Federation, or World Health Organization criteria. In addition to international evidence, this review highlights Portuguese contributions published in the Revista Portuguesa de Saúde Ocupacional, reinforcing the national relevance of these findings.  Discussion and Conclusion: Shift work emerges as a modifiable risk factor for Metabolic Syndrome and Cardiovascular Disease, mediated by circadian disruption and hormonal and behavioral alterations. Despite consistent results, methodological limitations (such as cross-sectional designs, self-reported data, and heterogeneous definitions of shift schedules) restrict generalizability. Future long-term cohort studies should adopt standardized Metabolic Syndrome metrics and integrate objective circadian assessment. From an occupational health perspective, periodic cardiometabolic screening, sleep hygiene and healthy lifestyle promotion, and alignment of work schedules with individual chronotype are recommended to mitigate adverse effects, to increase work satisfaction and productivity.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Trabalho por turnos]]></kwd>
<kwd lng="pt"><![CDATA[Ritmo circadiano]]></kwd>
<kwd lng="pt"><![CDATA[Síndroma metabólica]]></kwd>
<kwd lng="pt"><![CDATA[Doenças cardiovasculares]]></kwd>
<kwd lng="pt"><![CDATA[Saúde ocupacional]]></kwd>
<kwd lng="pt"><![CDATA[Medicina do Trabalho]]></kwd>
<kwd lng="pt"><![CDATA[Enfermagem do Trabalho]]></kwd>
<kwd lng="en"><![CDATA[Shift work]]></kwd>
<kwd lng="en"><![CDATA[Circadian rhythm]]></kwd>
<kwd lng="en"><![CDATA[Metabolic syndrome]]></kwd>
<kwd lng="en"><![CDATA[Cardiovascular diseases]]></kwd>
<kwd lng="en"><![CDATA[Occupational Health]]></kwd>
<kwd lng="en"><![CDATA[Occupational Medicine and Occupational Nursing]]></kwd>
</kwd-group>
</article-meta>
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