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| Duarte,L.L.; Menna-Barreto,L.; Miguel,M.A.L.; Louzada,F.; Araújo,J.; Alam,M.; Areas,R.; Pedrazzoli,M.. |
| Chronotype is an established concept designed to identify distinct phase relationships between the expression of circadian rhythms and external synchronizers in humans. Although it has been widely accepted that chronotype is subjected to ontogenetic modulation, there is no consensus on the interaction between age and gender. This study aimed to determine the relationship between age- and gender-related changes in the morningness-eveningness character in a large sample of people. A total of 14,650 volunteers were asked to complete the Brazilian version of the Horne and Östberg chronotype questionnaire. The data demonstrated that, on average, women were more morning-oriented than men until the age of 30 and there were no significant differences between men... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chronotype; Gender; Ontogeny; Circadian rhythms; Sleep timing. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000400316 |
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| OCAMPO-GARCÉS,ADRIÁN; MENA,WILSON; HERNÁNDEZ,FELIPE; CORTÉS,NELSON; PALACIOS,ADRIÁN G. |
| Rest activity pattern was studied in wild-captured males of Octodon degus (n=9), Octodon bridgesi (n=3), and Spalacopus cyanus (n=6) (Rodentia: Octodontidae). Ten-minute resolution actograms were constructed from data obtained by an automated acquisition system. After two months of habituation to a stable light-dark schedule, recordings were performed in isolation chambers under a 12: 12 Light Dark schedule. A free-running period (constant darkness) was recorded for O. bridgesi and S. cyanus. O. degus displayed a crepuscular pattern of rest activity rhythm. Entrained O. bridgesi and S. cyanus displayed nocturnal preference, with rest anticipating light phase and without crepuscular activity bouts. Under constant darkness, active phase occurred at... |
| Tipo: Journal article |
Palavras-chave: Circadian rhythms; Chronotype; Octodon; Octodontids; Spalacopus cyanus. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200003 |
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| Korczak,A.L.; Martynhak,B.J.; Pedrazzoli,M.; Brito,A.F.; Louzada,F.M.. |
| Inter-individual differences in the phase of the endogenous circadian rhythms have been established. Individuals with early circadian phase are called morning types; those with late circadian phase are evening types. The Horne and Östberg Morningness-Eveningness Questionnaire (MEQ) is the most frequently used to assess individual chronotype. The distribution of MEQ scores is likely to be biased by several fact, ors, such as gender, age, genetic background, latitude, and social habits. The objective of the present study was to determine the effect of different social synchronizers on the sleep/wake cycle of persons with different chronotypes. Volunteers were selected from a total of 1232 UFPR undergraduate students who completed the MEQ. Thirty-two subjects... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chronotype; Sleep/wake cycle; Morning types; Evening types; Circadian rhythm; Social zeitgebers. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008001000014 |
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| Allebrandt,K.V.; Roenneberg,T.. |
| Individual circadian clocks entrain differently to environmental cycles (zeitgebers, e.g., light and darkness), earlier or later within the day, leading to different chronotypes. In human populations, the distribution of chronotypes forms a bell-shaped curve, with the extreme early and late types _ larks and owls, respectively _ at its ends. Human chronotype, which can be assessed by the timing of an individual's sleep-wake cycle, is partly influenced by genetic factors - known from animal experimentation. Here, we review population genetic studies which have used a questionnaire probing individual daily timing preference for associations with polymorphisms in clock genes. We discuss their inherent limitations and suggest an alternative approach combining... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Human clock genes; Chronotype; Morningness/eveningness; Association studies; Latitudinal hypothesis. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000800013 |
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