| Full text | |
| Author(s): |
Nascimento de Alencar, Joao Carlos
[1]
;
Leocadio-Miguel, Mario Andre
[1, 2]
;
Duarte, Leandro Lourencao
[3]
;
Louzada, Fernando
[4]
;
Araujo, John Fontenele
[1, 2]
;
Pedrazzoli, Mario
[5]
Total Authors: 6
|
| Affiliation: | [1] Univ Fed Rio Grande do Norte, Programa Posgrad Psicobiol, Natal, RN - Brazil
[2] Univ Fed Rio Grande do Norte, Dept Fisiol, Natal, RN - Brazil
[3] Univ Fed Reconcavo Bahia, Ctr Ciencia Saude, Santo Antonio De Jesus - Brazil
[4] Univ Fed Parana, Dept Fisiol, Curitiba, Parana - Brazil
[5] Univ Sao Paulo, Escola Artes Ciencias & Humanidades, Sao Paulo - Brazil
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | ANNALS OF HUMAN BIOLOGY; v. 44, n. 7, p. 628-635, 2017. |
| Web of Science Citations: | 3 |
| Abstract | |
Background: Daylight Saving Time (DST) annually moves clocks 1 hour forward, when daytime is longer than night. Previous studies from medium and high latitude locations have pointed to a disruptive effect of DST on human circadian rhythms. Since Brazil is an equatorial country implementing DST, a different relationship between photic and social synchronisers may interfere with DST effects. Aim: To explore the prevalence and duration of self-reported discomfort related to DST among Brazilian residents (latitude 12-33 degrees S, longditude 39-57 degrees W). It was hypothesised that an elevated prevalence of self-reported discomfort would be found in Brazil, due to the pronounced uncoupling between social and geophysical synchronisers. Subjects and methods: In total, 12 467 volunteers completed a web-based, Brazilian version of Horne-ostberg Morningness-Eveningness Questionnaire, provided demographic information, and answered questions related to DST complaints (discomfort, duration of discomfort). Results: Of the total sample, 45.43% reported no discomfort related to DST, with meaningful proportions for all chronotypes. However, eveningness was most associated with discomfort. About one fourth of the total sample reported discomfort over the whole DST period. Gender interaction is largely supported by these results. Conclusions: DST at low latitude locations may be disruptive for circadian rhythms, since seasonality of sunrise near the equator is negligible or very mild. (AU) | |
| FAPESP's process: | 11/05804-5 - Phenotypic characterization of circadian rhythms in different genotype individuals for clock gene polymorphisms in different regions in Brazil: an emphasis on the effect of the gene PER3 and latitude |
| Grantee: | Mario Pedrazzoli Neto |
| Support Opportunities: | Regular Research Grants |