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Background: We explored the relationship between adolescent physical activity levels, socio-economic conditions and body mass index (BMI) in order to gain a deeper understanding of the relevant factors affecting adolescent obesity., Methods: A stratified random sampling method was used to conduct a questionnaire survey of middle school students in the Chengdu-Chongqing Economic Zone. Multiple linear and logistic regression analysis methods were used to statistically analyse the data obtained., Results: The level of moderate to vigorous physical activity (MVPA) not only significantly reduces the incidence of obesity in adolescents, it also has a positive effect on avoiding underweight in adolescents. The impact of a father's BMI on a son's weight is higher than that of a daughter, while the impact of a mother's BMI on a child's weight is the opposite. High monthly income has a positive effect on reducing the BMI of male and female adolescents, but full-time working mothers actually increase the risk of obesity in their children. Teenagers who have exercise habits or view exercise as a form of enjoyment have a significantly reduced risk of obesity., Conclusions: The level of MVPA and exercise habits are important factors in inhibiting the development of obesity in adolescent students., (© The Author(s) 2024. Published by Oxford University Press on behalf of Royal Society of Tropical Medicine and Hygiene.)

Objective: To explore the effect of physical exercise on learning burnout in adolescents, and to reveal the mediating effect of self-efficacy between different physical exercise amounts and learning burnout., Methods: A total of 610 adolescents from 5 primary and middle schools in Chongqing, China were investigated with the Physical Exercise Rating Scale (PARS-3), the General Self-Efficacy Scale (GSES), and the Learning Burnout Scale (LBS). The SPSS21.0 and AMOS21.0 statistical software were used to process and analyze the data., Results: (1) The physical exercise amount in boys was significantly higher than that in girls, but there was no significant gender difference in self-efficacy and learning burnout. Meanwhile, the academic alienation and low sense of achievement of primary school students were significantly lower than that of junior high school students, and there was no significant difference in the physical exercise amount and self-efficacy. (2) The physical exercise amount in adolescents was positively correlated with self-efficacy ( r  = 0.41), negatively correlated with learning burnout ( r  = -0.46), and self-efficacy was negatively correlated with learning burnout ( r  = -0.45). (3) The physical exercise amount could directly and negatively predict the learning burnout of adolescents ( β  = -0.40), and self-efficacy played a partial mediating effect between the amount of physical exercise and learning burnout (ES = -0.19). (4) Self-efficacy had no significant mediating effect between low exercise amount and learning burnout, but had a significant partial mediating effect between moderate (ES = -0.15) and high exercise amount (ES = -0.22) and learning burnout, and the partial mediating effect between high exercise amount and learning burnout was the highest., Conclusion: Physical exercise was an effective way to prevent or reduce learning burnout in adolescents. It can not only directly affect learning burnout, but also indirectly affect learning burnout through the mediating effect of self-efficacy. It should be pointed out that maintaining a sufficient amount of physical exercise is crucial to improving self-efficacy and reducing learning burnout., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Fu, Li, Liu, Li, Wang, Liu, Zhang and Zheng.)