Circadian variation of mood: comparison between different chronotypes (2005)
- Autor USP: BARRETO, LUIZ SILVEIRA MENNA - ICB
- Unidade: ICB
- Assunto: FISIOLOGIA
- Language: Inglês
- Abstract: Introduction:In the beginning of the 1980's two dimensions have emerged in the studies of human mood called positive affect (PA) and negative affect (NA). The first one is related to social engagement and the second to perceived stress. Several researchers have found that PA, but not NA, displays a circadian variation. The aim of this study is to find a circadian pattern in PA variation using the PANAS Portuguese version (Positive and Negative Affect Schedule). Another objective is comparing the PA circadian variation among chronotypes, using a Portuguese version the Horne-Ostberg Morningness-Eveningness Questionnaire (MEQ). The PANAS is a Likert-type scale, impeding parametric data processing, an alternative the visual analog scale (VAS). Therefore, in this work we have also applied a positive affect VAS and a negative affect VAS. Material and methods:The subjects were 30 medical students, who had answered the MEQ. After the determination of the chronotypes, they answered the PANAS and the VAS each three hours during wakefulness for two weeks. They also completed a sleep diary.The word we chose to represent the positive affect, in the VAS, was "atento" (attentive) and for the negative affect was "chateado"(upset). The circadian pattern was investigated with the Cosinor method. Correlations between PA variation and the chronotype will be tested with the Pearson's test and the scales will be compared with the Mann-Whyney's test.Partial results:Until this moment, data from 14 subjects were processed. Considering the PANAS results, 12 (85.7%) subjects displayed significant circadian variation of PA (for p<0.05) and only 2 (14.3%) of NA. For the VAS, 13 (92.8%) showed circadian variation for the word "atento" and only 2 (14.3%) for the word "chateado".
- Publisher: Comissão de Cultura e Extensão Universitária do ICB/USP
- Publisher place: São Paulo
- Date published: 2005
- Título do periódico: Resumos
- Conference titles: Congresso do Instituto de Ciências Biomédicas
ABNTPORTO, R.; DUARTE, Leandro Lourenção; MENNA-BARRETO, Luiz Silveira. Circadian variation of mood: comparison between different chronotypes. Anais.. São Paulo: Comissão de Cultura e Extensão Universitária do ICB/USP, 2005.
APAPorto, R., Duarte, L. L., & Menna-Barreto, L. S. (2005). Circadian variation of mood: comparison between different chronotypes. In Resumos. São Paulo: Comissão de Cultura e Extensão Universitária do ICB/USP.
NLMPorto R, Duarte LL, Menna-Barreto LS. Circadian variation of mood: comparison between different chronotypes. Resumos. 2005 ;
VancouverPorto R, Duarte LL, Menna-Barreto LS. Circadian variation of mood: comparison between different chronotypes. Resumos. 2005 ;
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