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      Behaviors associated to sleep among high school students: cross-sectional and prospective analysis Translated title: Comportamentos associados ao sono em estudantes do ensino médio: análises transversal e prospectiva


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          The association between health behaviors and sleep patterns in youths has been tested using cross-sectional data, and prospective evidence is needed. The aim of this study was to investigate the cross-sectional and prospective associations between behavioral variables and sleep quality and duration. A secondary analysis was conducted using data that were collected in March and December 2006 from a random sample of high school students (aged 14-24 years) from Recife and Florianopolis, Brazil, for the "Saúde na Boa" intervention. Data on the perception of sleep quality and duration and lifestyle variables were obtained through self-reported questionnaires. Data were analyzed using crude and adjusted binary logistic regressions. The percentages of students reporting poor sleep quality and insufficient sleep duration were 45.7% and 76.7%, respectively, considering the cross-sectional data, and 45.8% and 77.5%, respectively, considering the longitudinal data. There was a cross-sectional association between lower physical activity (OR = 0.74, 95% CI: 0.55, 0.99) and higher snack consumption (OR = 1.67, 95% CI: 1.18, 2.36) and negative sleep quality. Excessive TV watching (OR = 0.48, 95% CI: 0.30, 0.75) and higher levels of soft drink consumption (OR = 1.84, 95% CI: 1.19, 2.84) were associated with insufficient sleep duration. However, no behavioral variables were associated with sleep quality and duration in the prospective analysis. The prevalence of self-reported poor sleep quality and duration were similar in the cross-sectional and longitudinal analyses. Some behaviors were associated with sleep patterns in the cross-sectional analyses, but these findings were not confirmed in the prospective analyses.

          Translated abstract

          A associação entre comportamentos de saúde e sono tem sido testada em jovens com dados transversais, mas evidências prospectivas são necessárias. O objetivo do estudo foi verificar associações transversais e prospectivas entre variáveis comportamentais e percepções de qualidade e duração de sono. Análise secundária transversal e longitudinal dos dados da pesquisa "Saúde na Boa", desenvolvido de março a dezembro de 2006, com amostra aleatória de estudantes de ensino médio (14-24 anos) de 20 escolas públicas de Recife e Florianópolis. A percepção da qualidade e da duração do sono e as variáveis do estilo de vida foram obtidas por autorrelato. Utilizaram-se regressões logísticas binárias brutas e ajustadas. Nos dados transversais e longitudinais, 45,7% e 45,8% dos jovens relataram má qualidade e 76,7% e 77,5% reportaram duração insuficiente do sono, respectivamente. Na análise transversal, a menor prática de atividade física (OR = 0,74; IC 95%: 0,55; 0,99) e o maior consumo de salgados (OR = 1,67; IC 95%: 1,18; 2,36) estiveram associados à qualidade negativa do sono, enquanto o tempo excessivo de televisão (OR = 0,48; IC 95%: 0,30; 0,75) e de consumo de refrigerantes (OR = 1,84; IC 95%: 1,19; 2,84) associaram-se à duração insuficiente do sono. Na análise prospectiva, nenhum dos comportamentos estudados se manteve associado à qualidade e duração do sono. As prevalências de percepção de qualidade e duração do sono se mantiveram estáveis nos dois momentos analisados. Alguns comportamentos se associaram às percepções de sono em análises transversais, mas estes achados não se confirmaram em análises prospectivas.

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          Regulation of adolescent sleep: implications for behavior.

          Adolescent development is accompanied by profound changes in the timing and amounts of sleep and wakefulness. Many aspects of these changes result from altered psychosocial and life-style circumstances that accompany adolescence. The maturation of biological processes regulating sleep/wake systems, however, may be strongly related to the sleep timing and amount during adolescence-either as "compelling" or "permissive" factors. The two-process model of sleep regulation posits a fundamental sleep-wake homeostatic process (process S) working in concert with the circadian biological timing system (process C) as the primary intrinsic regulatory factors. How do these systems change during adolescence? We present data from adolescent participants examining EEG markers of sleep homeostasis to evaluate whether process S shows maturational changes permissive of altered sleep patterns across puberty. Our data indicate that certain aspects of the homeostatic system are unchanged from late childhood to young adulthood, while other features change in a manner that is permissive of later bedtimes in older adolescents. We also show alterations of the circadian timing system indicating a possible circadian substrate for later adolescent sleep timing. The circadian parameters we have assessed include phase, period, melatonin secretory pattern, light sensitivity, and phase relationships, all of which show evidence of changes during pubertal development with potential to alter sleep patterns substantially. However the changes are mediated-whether through process S, process C, or by a combination-many adolescents have too little sleep at the wrong circadian phase. This pattern is associated with increased risks for excessive sleepiness, difficulty with mood regulation, impaired academic performance, learning difficulties, school tardiness and absenteeism, and accidents and injuries.
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            Relationships between hours of sleep and health-risk behaviors in US adolescent students.

            To examine associations between insufficient sleep ( 1time/day (AOR, 1.14; 95% CI, 1.03-1.28). Two-thirds of adolescent students reported insufficient sleep, which was associated with many health-risk behaviors. Greater awareness of the impact of sleep insufficiency is vital. Published by Elsevier Inc.
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              Adolescents' sleep behaviors and perceptions of sleep.

              Sleep duration affects the health of children and adolescents. Shorter sleep durations have been associated with poorer academic performance, unintentional injuries, and obesity in adolescents. This study extends our understanding of how adolescents perceive and deal with their sleep issues. General education classes were randomly selected from a convenience sample of three high schools in the Midwest. Three hundred eighty-four ninth- to twelfth-grade students (57%) completed a self-administered valid and reliable questionnaire on sleep behaviors and perceptions of sleep. Most respondents (91.9%) obtained inadequate sleep (

                Author and article information

                Role: ND
                Role: ND
                Role: ND
                Role: ND
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                Revista Brasileira de Cineantropometria & Desempenho Humano
                Rev. bras. cineantropom. desempenho hum.
                Universidade Federal de Santa Catarina (Florianópolis )
                July 2014
                : 16
                : suppl 1
                : 68-78
                [1 ] Universidade Federal de Santa Catarina Brazil



                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1980-0037&lng=en
                SPORT SCIENCES

                Sports medicine
                Adolescent,Adolescent behavior,Brazil,Prospective studies,Sleep,Adolescente,Brasil,Comportamento do adolescente,Estudos prospectivos,Sono


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