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Sleep as a component of the 24-h cycle: Adherence to 24-h movement behaviour guidelines in 6002 school-adolescents from Pernambuco.


A recent paradigm shift has highlighted the importance of considering the movement behaviors (sleep, sedentary behavior, and physical activity) combined rather than examining each behavior individually. For that reason, guidelines providing recommendations for each of these behaviors over a 24h cycle have been released. However, whether adolescents adhere to these guidelines remain a matter of debate.


To analyze the adherence to the 24h movement behavior guidelines in a representative sample of students from Pernambuco


This is a cross-sectional study involving 6003 adolescents students aged 14-19 years old (54.9% of girls). Data collection was performed using a modified version of the Global School-based Student Health, which was applied through group interviews. Sleep duration was measured by the question “On normal week-days, How many hours do you sleep a day?” Sedentary behavior was measured as recreational screen time (television + computer + videogame time), while moderate to vigorous physical activity (MVPA) was measured through the question “During a normal week, how many days do you do MVPA?”. The adherence to the 24h movement behavior guidelines was defined as having 8-10h/day of sleep, recreational screen time <2h/day, and MVPA ≥60min/day. The proportion of adolescents who adhered to none, one, two, or the full recommendation was calculated and a chi-square test was employed to compare the adherence to the guidelines according to sex, using a p<0.05 as statistically significant.


The proportion of adolescents who adhered to the 24-h movement behavior guidelines was 0.2% in boys and 0.1% in girls. In addition, 10.6% of boys and 5.2% of girls adhered to two recommendations, 41.8% of boys and 37.3% of girls adhered to one recommendation, and 47.5% of boys and 57.4% of girls adhered to none of the recommendations. Among those adhering to two recommendations, adherence to sleep and MVPA was the most prevalent (91.2% for boys, 77.6% for girls). The chi-square showed a statistically significant difference between boys and girls (p<0.001), indicating that boys tend to adhere more to two recommendations (10.6% vs. 5.2%) and less to none of the recommendations (49.5% vs. 57.4%).


There was poor adherence to the 24h movement behavior among adolescents, which seems to be mainly explained by the high recreational screen time.


Sleep; Movement Behaviours; Adolescents.


Área Básica


Universidade de Pernambuco - Pernambuco - Brasil


Maria Julia Lyra, Antonio Henrique Germano-Soares, Cynthia Dantas Vicente, Mauro Virgílio Gomes Barros, Marcos André Moura Santos