DBIO - Departamento Biologia

URI Permanente desta comunidadehttps://repositorio.ufrn.br/handle/1/4

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Changes in sleep habits and knowledge after an educational sleep program in 12th grade students
(Wiley, 2013) Sousa, Ivanise Cortez; Souza, Jane Carla; Louzada, Fernando Mazzilli; Azevedo, Carolina Virginia Macêdo
The objective of this research was to evaluate the effect of an education program using the meaningful learning approach on sleep knowledge and habits of 12th grade students. Thirty-four student volunteers (aged 16.8 0.6 years) were divided into intervention (Sleep Education Program – SEP) and control groups. Sleep knowledge and habits were assessed by the “health and sleep” questionnaire. Also, the students filled out a sleep diary and the Karolinska Sleepiness Scale by one week (Stage 1). These procedures were repeated 3 weeks after the SEP (Stage 2) that was evaluated by a questionnaire. The SEP consisted of five 50-minute classes to discuss the physiological and behavioral processes of sleep and healthy lifestyle. At Stage 2, the intervention group increased the percentage of correct responses in 63% of the questions. On weekdays, they increased time in bed by 26 min, woke up 11 min later and showed a tendency to go to bed 18 min earlier (P = 0.07). On weekends, they advanced bedtime and wake-up times. These changes were associated with decreased irregularity at bedtimes and wake up times. These results were not observed in the control group, except the advance on wake up time on weekends. The frequency and duration of naps and daytime sleepiness levels did not differ between the stages for both groups. The SEP increased knowledge and contributed to positive changes in the adolescents’ sleep-wake cycle (SWC). However, daytime sleepiness levels remained unchanged probably due to an insufficient reduction on sleep deprivation to decrease its negative consequences
Effect of morning exercise in sunlight on the sleep-wake cycle in adolescents
(Instituto Brasileiro de Neuropsicologia e Comportamento (IBNeC), 2011) Maia, Ana Paula Leão; Sousa, Ivanise Cortez de; Azevedo, Carolina Virginia Macêdo de
A delay in bedtime occurs in adolescence compared with childhood. However, the early waking that morning school hours impose leads to partial sleep deprivation. Although exposure to light is the most important regulator of circadian rhythm in mammals, physical exercise influences circadian synchronization. To assess the effect of morning physical exercise in sunlight on the sleep-wake cycle (SWC) in adolescents, 160 first- and second-year high-school students were exposed to classes in their usual classroom (Group C) or in a swimming pool exposed to sunlight (Group E) while physically exercising (EE; i.e., swimming) or resting (EL). At baseline, we applied Health and Sleep and Horne & Ostberg chronotype assessment questionnaires. One week later and during the intervention, we applied the Sleep Diary and Karolinska Sleepiness Scale. During the intervention we observed no changes in bedtime, time in bed and in indices of irregularity of bedtime and wake-up time. The changes observed in wake-up time (i.e., a delay in the EE group on Saturday), sleep quality (i.e., an improvement), and sleepiness (i.e., an increase) were also observed in the control group, discarding an intervention effect. We suggest that morning physical exercise in sunlight had no effect on SWC parameters, sleep quality, or daytime sleepiness, possibly because of the large irregularity in the SWC between weekdays and weekends in adolescent students as well as the low frequency and duration of exercise during the intervention. Therefore, studies that evaluate a higher frequency or duration of exercise are needed to assess its effect on the SWC in adolescents

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