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Objective To evaluate the influence of chronic psychosocial stress on BMI in adolescents.Methods Physical examination and questionnaire survey were conducted among the students of junior grade 1 and senior grade 1 in 10 middle schools in Xuzhou in September 2011.Their body height and weight were measured at baseline survey and the self-report information about socio-demographic data,emotional symptoms (depressive symptoms,anxiety symptoms),and life style/behavior were collected from them.Chronic psychosocial stress was assessed with Multidimensional Life Events Rating Questionnaire (MLERQ),which consists of five items,stress of family life,school life,peer relation,gender relation and health growth.Results A total of 5 473 valid questionnaires were collected for analysis (2 841 from boys and 2 632 from girls).The follow-up measurement of body height and weight were conducted in September 20 13.A total of 4 316 students (2 171 boys,2 145 girls) were surveyed,and 1 157 students missed the follow up.The psychosocial stress score in the overweight and obese girls at baseline survey was positively associated with BMI-Z increase at follow up survey (P＜0.01).No such effect was observed among the boys at follow-up survey.Conclusion High level of chronic psychosocial stress could lead to BMI increase in overweight and obese girls,suggesting that female adolescents are susceptible population of psychosocial stress induced obesity.
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Objective To describe the relationships between sleep duration,dietary patterns and overweight/obesity among adolescents in Xuzhou,and to develop prevention and intervention strategies for adolescent-obesity.Methods Data of 3 103 boys and girls from 5 junior high schools were analyzed.Self-reported information on duration of sleep,dietary patterns,physical activities and time spent on watching video/audio program were assessed and physique data was also collected.Descriptive statistics,multiple liner regression and logistic regression models were used.Results The prevalence rates on overweight and obesity in boys were 23.5％ and 22.5％,and in girls were 18.1％ and 11.9％,respectively.Proportions of insufficient sleep (＜ 8 h/d) in boys appeared 28.1％ and in girls as 33.0％.From logistic regression analysis revealed that there appeared risk on the prevalence of overweight and obesity in boys who had sleep duration ＜7 h/d [OR(95％CI):1.72 (1.08-2.74)],but no significant association was found between duration of sleep and overweight/ obesity in girls.After adjusting on age,levels of parental education,family income,physical activities,time spent on watching video/audio programs,and weight status,boys who had sleep duration less than 7 h/d would have the odds ratio of 1.69 (1.10-2.73),for the likelihood of increasing the frequency of eating snacks compared to their counterparts who had sleep duration of ≥8 h/d.Conclusion The Shortened duration of sleep seemed an independent risk factor on overweight/ obesity among male adolescents,and it was associated with the increased frequency of eating snacks.Data from our study showed that the dietary patterns might play a role in the association between duration of sleep and overweight/obesity,among male adolescents.