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Early chronotype with advanced activity rhythms and dim light melatonin onset in a rural population.
Ruiz, Francieli S; Beijamini, Felipe; Beale, Andrew D; Gonçalves, Bruno da Silva B; Vartanian, Daniel; Taporoski, Tâmara P; Middleton, Benita; Krieger, José E; Vallada, Homero; Arendt, Josephine; Pereira, Alexandre C; Knutson, Kristen L; Pedrazzoli, Mario; von Schantz, Malcolm.
Afiliação
  • Ruiz FS; Department of Psychiatry, University of São Paulo School of Medicine, São Paulo, Brazil.
  • Beijamini F; Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK.
  • Beale AD; Department of Psychiatry, University of São Paulo School of Medicine, São Paulo, Brazil.
  • Gonçalves BDSB; Federal University of Fronteira Sul, Realeza, Brazil.
  • Vartanian D; Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK.
  • Taporoski TP; School of Arts, Science, and Humanities, University of São Paulo, São Paulo, Brazil.
  • Middleton B; School of Arts, Science, and Humanities, University of São Paulo, São Paulo, Brazil.
  • Krieger JE; Department of Psychiatry, University of São Paulo School of Medicine, São Paulo, Brazil.
  • Vallada H; Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
  • Arendt J; Federal University of Fronteira Sul, Realeza, Brazil.
  • Pereira AC; Incor, University of São Paulo School of Medicine, São Paulo, Brazil.
  • Knutson KL; Department of Psychiatry, University of São Paulo School of Medicine, São Paulo, Brazil.
  • Pedrazzoli M; Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK.
  • von Schantz M; Incor, University of São Paulo School of Medicine, São Paulo, Brazil.
J Pineal Res ; 69(3): e12675, 2020 Oct.
Article em En | MEDLINE | ID: mdl-32598502
Studying communities at different stages of urbanisation and industrialisation can teach us how timing and intensity of light affect the circadian clock under real-life conditions. We have previously described a strong tendency towards morningness in the Baependi Heart Study, located in a small rural town in Brazil. Here, we tested the hypothesis that this morningness tendency is associated with early circadian phase based on objective measurements (as determined by dim light melatonin onset, DLMO, and activity) and light exposure. We also analysed how well the previously collected chronotype questionnaire data were able to predict these DLMO values. The average DLMO observed in 73 participants (40 female) was 20:03 ± 01:21, SD, with an earlier average onset in men (19:38 ± 01:16) than in women (20:24 ± 01:21; P ≤ .01). However, men presented larger phase angle between DLMO and sleep onset time as measured by actigraphy (4.11 hours vs 3.16 hours; P ≤ .01). Correlational analysis indicated associations between light exposure, activity rhythms and DLMO, such that early DLMO was observed in participants with higher exposure to light, higher activity and earlier light exposure. The strongest significant predictor of DLMO was morningness-eveningness questionnaire (MEQ) (beta=-0.35, P ≤ .05), followed by age (beta = -0.47, P ≤ .01). Sex, light exposure and variables derived from the Munich chronotype questionnaire were not significant predictors. Our observations demonstrate that both early sleep patterns and earlier circadian phase have been retained in this small rural town in spite of availability of electrification, in contrast to metropolitan postindustrial areas.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: População Rural / Sono / Inquéritos e Questionários / Ritmo Circadiano / Relógios Circadianos / Melatonina Tipo de estudo: Clinical_trials / Prognostic_studies Aspecto: Determinantes_sociais_saude Limite: Adult / Female / Humans / Male / Middle aged Idioma: En Revista: J Pineal Res Assunto da revista: ENDOCRINOLOGIA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
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XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: População Rural / Sono / Inquéritos e Questionários / Ritmo Circadiano / Relógios Circadianos / Melatonina Tipo de estudo: Clinical_trials / Prognostic_studies Aspecto: Determinantes_sociais_saude Limite: Adult / Female / Humans / Male / Middle aged Idioma: En Revista: J Pineal Res Assunto da revista: ENDOCRINOLOGIA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido