Latitude and social habits as determinants of the distribution of morning and evening types in Brazil

Latitude and social habits as determinants of the distribution of morning and evening types in Brazil

Autor Benedito-Silva, A. A. Google Scholar
Menna-Barreto, L. Google Scholar
Alam, M. F. Google Scholar
Rotenberg, L. Google Scholar
Moreira, LFS Google Scholar
Menezes, AAL Google Scholar
Silva, H. P. da Google Scholar
Marques, N. Google Scholar
Instituição Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Univ Fed Pelotas
Fundacao Oswaldo Cruz
Univ Fed Rio Grande do Norte
Museu Emilio Goeldi
Resumo Previous application of a Portuguese Version of the Horne and Ostberg (H&O) questionnaires in Brazil showed a displacement of the distribution of Morningness/Eveningness (M/E) types towards morningness, demanding a reclassification of the score's limits for each of the 5 possible M/E types. Among city, age and sex, city was the only factor determining significant group differences. in the present paper, the same version of the H&O's questionnaire was applied to a distinct population of 260 adults, balanced according to age, sex and city. Data were collected from October to December, to control the effect of the photoperiod. City remains the only factor determining significant group differences (p<0.001). Moreover, there does not appear a coherent latitude trend that could explain differences among cities as a function of photoperiod. Local social habits could probably explain our results, suggesting further investigations of peculiar temporal patterns.
Palavra-chave questionnaire
morningness-eveningness
chronotypes
social habits
latitude
Idioma Inglês
Data de publicação 1998-12-01
Publicado em Biological Rhythm Research. Abingdon: Taylor & Francis Ltd, v. 29, n. 5, p. 591-597, 1998.
ISSN 0929-1016 (Sherpa/Romeo, fator de impacto)
Publicador Taylor & Francis Ltd
Extensão 591-597
Fonte http://dx.doi.org/10.1076/brhm.29.5.591.4823
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000079260600019
Endereço permanente http://repositorio.unifesp.br/handle/11600/25992

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