This study demonstrates the beneficial effects on sleep duration and depressive symptoms in obese adolescents who participated in a multicomponent school-based intervention. To the best of our knowledge, this is the first study on the impact of a multicomponent intervention regarding sleep duration and depressive symptoms in obese adolescents from the Northeast region of Brazil. Most previous studies in adolescents focused only on exercise as an intervention to reduce sleep-related issues (Mendelson et al., 2015; Santiago et al., 2015; AWAD et al., 2013) or educational actions on sleep (Gruber et al., 2016; Wang et al., 2015; Hendricks et al., 2014; Moseley & Gradisar, 2009), and often these studies did not focus only on obese students.
School-based health promotion is a crucial tool for public health, and the development of multicomponent interventions to promote healthy habits has been encouraged by various international organizations (BRASIL, 2022; CDC, 2019; Okan et al., 2020).
A study conducted in Spain with 121 school adolescents (55 in the intervention group) aimed to investigate the impact of a multicomponent intervention (educational sessions, educational material, and dietary guidance based on the Mediterranean diet) in a school setting over two and a half months. They identified positive effects on dietary behavior and physical activity during the weekend. However, there were no improvements in sleep duration. The authors justified these results based on two hypotheses: the lack of family commitment, as parents can help establish bedtime routines and monitor technology use, as well as the need for a greater emphasis on sleep in the sessions that were conducted (Tapia & Serrano, 2021).
On the other hand, a systematic review aimed at investigating the effects of multicomponent interventions on the sleep of children (0 to 5 years) found an increase in sleep duration among those children who participated in the intervention. It is important to note that most of the interventions involved parents and educational programs (Fangupo et al., 2021).
In contrast, multicomponent interventions in a school setting have not clearly indicated their specific effects on overweight students. This could be because multicomponent school-based studies are still scarce, especially in Brazil (Jacob et al., 2021; Karacabeyle et al., 2018), or interventions are still carried out specifically to reduce sedentary behavior (Zhang et al., 2022), increase physical activity levels (Calcattera; Zucoti, 2022), or make dietary changes (Rose et al., 2021; Morel-Azanza et al., 2019).
Thus, it is believed that the improvements in sleep duration in this study can be attributed to the increase in physical activity in the school environment. In addition to the increase in active activities in physical education classes, toys and balls were made available for use during recess and after lunch. Furthermore, the tasks suggested in physical education classes encouraged physical activity on weekends. This also reinforces the importance of school actions that include obese adolescents alongside non-obese ones, as the literature has already presented the benefits of physical activity on sleep among adolescents, but outside the school environment (Bello et al., 2023).
This intervention had a significant impact on reducing the percentage of adolescents with depressive symptoms. Additionally, in the univariate analysis, an association was observed between participation in the intervention and the absence of depressive symptoms. These results are consistent with the literature (Yu et al., 2022; Mehra et al., 2022; Paul & Usha, 2021; Tejada-Gallardo et al., 2020).
An intervention study conducted in 75 Indian schools (15,832 students) over two years (2015-2016) divided its actions into two groups: a) training a school counselor, and b) training teachers so that they could conduct classes on gender and sexuality, sexually transmitted diseases, and positive relationships for ninth-grade students. In addition, some actions involved the entire school, as well as parents and the community. The authors found an improvement in mental health (a decrease in depressive symptoms) in students, regardless of which group they participated in (Shinde et al., 2020).
In this intervention, in addition to curriculum content aimed at improving lifestyle, the increase in physical activity in the school environment may have contributed to the reduction of depressive symptoms, as the literature indicates physical activity as beneficial for the physical and mental health of obese adolescents (Hale et al., 2021; Recchia et al., 2023; Sluijs et al., 2021). Thus, the use of physical activity in multicomponent school-based interventions is reinforced, as preliminary evidence suggests that school-based interventions provide a feasible means to prevent the worsening of depressive symptoms in youth (Filia et al., 2021).
However, even though physical activity is recommended and environmental changes and inclusion of related content in school-based interventions for the prevention and reduction of mental health problems, designing an intervention can be a complex process. The success of school interventions has been sporadic, perhaps due to the lack of collaboration and contribution from the main stakeholders, students and schools. After all, developing an intervention for young people would require their commitment, which would help to ensure an effective implementation (Neill et al., 2022).
In this study, no effects of the intervention on eating disorders were identified. This may have occurred due to the recommended form of treatment, which includes psychological approaches, including cognitive-behavioral therapy, interpersonal psychotherapy, and dialectical behavior therapy (Mangione et al., 2022). Furthermore, there are few multicomponent school-based studies aiming to reduce eating disorders.
In the present intervention, the nutritional status of adolescents did not change, and these results corroborate the literature (Berria, 2017; Amini et al., 2015). Intervention studies conducted in a school environment that provided only an increase in physical activity levels (Liu et al., 2022), eating habits changes (Raynor et al., 2021), or both simultaneously (Recasens et al., 2019; Wolf et al., 2018) managed to observe a decrease in body mass indices. However, recommendations for the prevention and treatment of childhood and adolescent obesity suggest the commitment of parents, changes in the school environment, nutritional education, and the promotion of long-term physical activity interventions (Denova-Gutiérrez et al., 2023; Tugault-Lafleur et al., 2023; Smit et al., 2023; Jacob et al., 2021) to avoid the need for surgical interventions in early life. It is also important to note the use of digital media in interventions among adolescents due to its greater acceptance and previously identified results (Vilardell-Dávila et al., 2023; Lee et al., 2023).
Among the limitations of this study, it should be mentioned that the subjective assessment of variables through self-report has greater imprecision, especially in the younger population (Alves et al., 2020); however, the use of objective measures was beyond the scope of this study. Additionally, the intervention conducted had a relatively short duration, lasting approximately four months, as well as the post-intervention follow-up period, making it challenging to assess long-term objectives.
Nevertheless, some practical implications for the school context can be suggested based on the development of this study. Implementing strategies that involve different school contexts (classroom, school management) and components (teachers, students, parents) may be essential for promoting health in the young population. Investing in rest areas in full-time schools could be relevant to prevent students from becoming idle. Furthermore, topics related to sleep could be included in the curriculum to provide students with more information about the importance of sleep for their health.