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Analysis of sleep duration per study shift in adolescents from Rio Branco, Acre.


Background: Sleep duration plays an important role in adolescent health. During adolescence there are biological and behavioral changes that lead to a phase delay in the sleep-wake cycle, which added to the social and school contexts, reflects a decrease in sleep hours. Studies show that adolescent students from different shifts experience different sleep durations, causing health impacts.


Objective: To analyze sleep duration per study shift in adolescents from Rio Branco, Acre.


Methods: Cross-sectional study with 1,733 adolescents aged 12 to 17 years, students of the morning or afternoon shifts in the capital Rio Branco, Acre, participants of the Study of Cardiovascular Risks in Adolescents - ERICA. The variable sleep duration was collected through a questionnaire. Mean sleep duration for school days (Monday to Friday), weekend (Saturday and Sunday), and weekly sleep duration (weighted average) were calculated. Absolute and relative frequencies were calculated. Comparison of proportions was performed by Pearson's chi-square test, the means by Student's t-test, with significance level of 5% between study shift groups.


Results: The average weekly and class days sleep duration of adolescents studying in the morning shift were lower than the averages of adolescents studying in the afternoon, 7.79 ± 1.09 and 7.17 ± 1.27 (p <0.0001) respectively. The average weekend sleep duration of the morning shift adolescents was higher than the average of the afternoon shift, 9.33 ± 1.63 (p = 0.016), especially among boys (p = 0.007), inferring the attempt to compensate sleep deficit during school days. Boys' sleep duration (8.00 ± 1.06) was shorter than girls' sleep duration (7.52 ± 1.06). The average sleep duration decreased markedly when considering only school days, 6.83 ± 1.23 and 7.45 ± 1.23, for boys and girls, respectively.


Conclusion: Morning shift adolescents had shorter sleep duration than afternoon shift adolescents during school days. However, over the weekend this group of teenagers try to compensate for their sleep deficit by sleeping more hours of sleep. Studying sleep duration and its consequences among adolescent students from different shifts can contribute to health promotion and better student performance.


Keywords: Sleep Duration. Study Shift. Adolescents.


Área Básica


Emanuela de Souza Gomes dos Santos, Orivaldo Florencio de Souza