Latitudinal cline of chronotype
Open accessAbstract
The rotation of the Earth around its own axis and around the sun determines the characteristics of the light/dark cycle, the most stable and ancient 24 h temporal cue for all organisms. Due to the tilt in the earth's axis in relation to the plane of the earth's orbit around the sun, sunlight reaches the Earth differentially depending on the latitude. The timing of circadian rhythms varies among individuals of a given population and biological and environmental factors underlie this variability. In the present study, we tested the hypothesis that latitude is associated to the regulation of circadian rhythm in humans. We have studied chronotype profiles across latitudinal cline from around 0° to 32° South in Brazil in a sample of 12,884 volunteers living in the same time zone. The analysis of the results revealed that humans are sensitive to the different sunlight signals tied to differences in latitude, resulting in a morning to evening latitudinal cline of chronotypes towards higher latitudes.
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Previous studies in humans found a correlation between latitude and chronotype variation.
“Previous studies in humans found a correlation between latitude and chronotype (morningness vs. eveningness) variation (Leocadio-Miguel et al. 2017; Randler and Rahafar 2017; Lowden et al. 2018)”
From Archaic Introgression Shaped Human Circadian Traits (2023) · cites this paper as Leocadio-Miguel et al. 2017
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Poor sleep is a health crisis for physicians and nurses
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- Authors
- Leocadio-Miguel, M. A., Louzada, F. M., Duarte, L. L., Areas, R. P., Alam, M., Freire, M. V., Fontenele-Araujo, J., Menna-Barreto, L., & Pedrazzoli, M.
- Affiliations
- Universidade Federal do Recôncavo da Bahia (BR)
- Universidade de São Paulo (BR)
- Universidade Federal de Pelotas (BR)
- ORCID
- Venue
- Scientific Reports
- Published
- 2017-07-14
- Volume
- 7
- Issue
- 1
- Pages
- 5437-5437
- ISSN
- 2045-2322 (ISSN-L)
- PMC
- PMC5511182
- OpenAlex
- W2735518723
- Cited by
- 99
- References
- 40
- Citations by year
- 2026: 10 · 2025: 12 · 2024: 11 · 2023: 15 · 2022: 7 · 2021: 12 · 2020: 8 · 2019: 10 · 2018: 11 · 2017: 3
- FWCI
- 5.35
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Scientific Reports (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (publishedVersion, other-oa)
- Americanae (AECID Library) (submittedVersion, other-oa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, other-oa)
- Funders
- Department of Science and Technology, Ministry of Science and Technology, India
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Keywords
- chronotype, latitudinal cline, circadian rhythm, sun exposure, light-dark cycle, circadian variation, latitude
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