Objective: To verify the applicability of the theory of planned behavior(TPB) in the physical exercise behaviors of rural adolescents in Sichuan Province, and to explore the possible influencing factors of physical exercise behaviors, and to provide a theoretical basis for further effective intervention measures. Methods: A total of 2 302 students were selected from grade seven and grade ten of two rural middle schools in Zizhong, Sichuan Province. The survey was conducted with a structured questionnaire. Using TPB as the research framework and basis, the structural equation model was constructed for analysis. Results: Lack of physical exercise was 1 527(66.3%).Physical exercise behavior was statistically different among schools, grades(t=-7.40，-2.90，10.90,P<0.05)， and genders. Based on TPB, the structural equation model was established and corrected to obtain the revised model, and the fitting index GFI=0.93, CFI=0.94, NFI=0.94, TLI=0.93, IFI=0.94,RMSEA=0.07, indicating the model fitted good. Exercise intention directly affected exercise behaviors. The standardized effect was 0.45(95%CI=0.39-0.52). Subjective norms and perceived power were the main two mediators of the relationship between value evaluation and exercise intention. The standardized effect values were 0.66(95%CI=0.57-0.73), 0.23(95%CI=0.16-0.93)(P<0.01). Conclusion There is serious lack of physical exercise in rural adolescents in Sichuan Province. TPB has a good applicability for physical exercise in rural adolescents in Sichuan Province. Subjective norm is the most important factors to promote exercise intentions.

Objective: To analyze the impact of intergenerational care on child physical health, so as to provide references for promoting the overall development of children s health. Methods: Based on the 2016 national data of the Chinese Family Tracking Survey, descriptive statistics, Mann Whitney U test, Kruskal-Wallis H test and OLS regression analysis were used to explore the relationship between health status of 4 226 children aged 0-14 and intergenerational care. Results: OLS regression analysis showed that intergenerational care had a significant impact on physical health of preschool children (t=-2.11,P=0.04), but had no significant impact on the health of school-age children (t=-0.58,P=0.56). Annual family income, family population size, age and gender of caregivers had a significant impact on the health of preschool children (P<0.05).The self-rated health of caregivers and whether children participated in medical insurance had a significant impact on the health of all children (P<0.01). Conclusion Intergenerational care has a significant impact on the health status of preschool children, but has no impact on the health status of school age children. Attention should be paid to the health of caregivers, medical insurance condition and the impact of physical exercise on children’s health, as well as the health literacy improvement of child caregivers, and children’s medical insurance and welfare.

Objective: To explore the influence of WeChat-led diversified health education on college students physical exercise behavior and self-body image. Methods: The cluster stratified sampling method was adopted to select 276 students from Changzhou College of Information Technology in March 2019. According to the random number table method, they were divided into 145 cases in the treatment group and 131 cases in the control group. The control group was given regular physical exercise education, and the treatment group jointly applied diversified physical exercise health education based on WeChat. Three months later, the physical exercise behavior and self-body image of the two groups of college students were compared. Results: The college students in the treatment group regularly participated in physical exercise (79.31%), exercise frequency ≥3 times/week(70.34%), exercise time ≥30 min/time(64.60%), and each exercise intensity medium and above(73.10%), monthly exercise cost 100-300 yuan/month(49.66%), which were significantly higher than the control group (62.60%, 54.20%, 51.15%, 61.07%, 36.64%), monthly exercise cost <100 yuan(33.79%),sports injury (47.59%) were significantly lower than the control group (49.62%,59.54%), the difference were statistically significant (P<0.05). Appearance evaluation score (3.87±0.32), appearance attitude score (3.92±0.28), physical fitness attitude score (3.80±0.33), health evaluation score (3.78±0.24), disease attitude score (3.54±0.42), body part satisfaction score (3.61±0.38) and overweight worry score (3.14±0.45) were significantly higher than those of the control group (3.54±0.36, 3.60±0.34, 3.56±0.42, 3.51±0.31, 3.01±0.36, 3.32±0.41, 2.78±0.35), the difference was statistically significant (t=8.06, 8.57，5.30, 8.13, 11.15, 6.10, 7.36, P<0.05). Conclusion Diversified health education based on WeChat is helpful to promote the development of college students- physical exercise behavior, and has positive application value for improving self-body image.

Objective: To investigate the relationship between breakfast eating frequency and health-risk behavior of high school students in Chongqing, and provide a reference for conducting students to get a good habit of eating breakfast everyday. Methods: A total of 3 283 high school students in Chongqing were selected to participate in a questionnarie by using convenience sampling method. Logistic regression analysis were condueted to analyze the influences made by the unhealty eating behaviors on eating frequency of breakfast. Results: There were 2 064(69.2%) students eating breakfast everyday, 1 219(37.1%) students having no breakfast or eating breakfast sometimes. There were significant differences between different gender, grade, native place, drinking energy drink, smoking, drinking alcohol, gambling, internet addiction students rate of unhealthy breakfast eating frequency(χ2=6.80, 53.97, 8.10, 23.79, 7.89, 16.31, 3.93, 17.96, P<0.05), the males (36.1%) was beyond the females(33.3%), the energy drink drinkers(41.2%) was beyond the non-drinkers(31.7%), the smokers (40.9%) was beyond the non-smokers(34.4%), the alcohol drinkers(40.3%) was beyond the non-drinkers(33.3%), the gamblers(39.7%) was beyond the non-gamblers(34.3%), those having internet addictions (40.0%) was beyond those having no addictions(33.0%). Drinking energy drink(OR=1.32, 95%CI=1.12-1.55), drinking alcohol(OR=1.24, 95%CI=1.02-1.51), internet addiction(OR=1.42, 95%CI=1.19-1.68) were positively correlated with unhealthy breakfast eating frequency of high school students(P<0.05). Conclusion Social, families and schools should strengthen the guidance of high school students to develop the habit of eating breakfast every day, and advoid the clustering of skipping breakfast and health-risk behaviors.

Objective: To understand the status of e-cigarette use among junior high school students in Zhengzhou City and its associated factors, and to provide support for tobacco control intervention for junior high school students. Methods: From March to May 2019 in Zhengzhou, a stratified cluster random sampling method was used to investigate 3 624 junior high school students using a self-made e-cigarette questionnaire, including demographic information, attitudes towards e-cigarettes, usage behavior, smoking behaviors of parents and friends. Results: The usage rate of e-cigarettes for junior high school students in Zhengzhou was 5.5%, parents and 51.5% of junior high school students purchased e-cigarettes online, 28.3% purchased them through stores, and 20.2% purchased e-cigarettes through other methods. Regarding the item use of e-cigarettes was harmful to others, the proportion of students with an approved attitude was lower than that with negative attitudes, the difference was statistically significant(χ2=4.33, P<0.05). Logistic regression analysis showed that e-cigarette was difficult to quit, the use of e-cigarettes won t make people feel relaxed, e-cigarette smoke was harmful to others , e-cigarette use did not make young people more attractive were negatively correlated with the use of e-cigarettes by middle school students(OR=0.46, 0.28, 0.57, 0.41, P<0.01). Conclusion The use of e-cigarettes by junior high school students in Zhengzhou is relatively serious, and multiple measures should be taken to strengthen health education and reduce the use rate of e-cigarettes.

Objective: To understand the level of radius speed of sound (SOS) in female college students and explore the effect of dietary on their bone health,so as to provide a reference for effective prevention fracture and osteoporosis among college students. Methods: A total of 363 female college students were selected by multistage stratified random sampling method. Dietary intake was assessed with a self-administered food frequency questionnaire, principal component analysis was used to derive dietary patterns. Speed of sound was measured by ultrasonic bone densitometer. Results: In all, the mean SOS of female college students was(4 138.0±114.3)m/s, 26.7% of female college students had low bone mass. Three dietary patterns were identified by factor analysis, explaining 55.4% of the diet variation: "snack" "plant" "high protein and high fat" patterns, respectively. Multiple linear regression analysis showed that with the increase of age, the level of SOS in radius increased significantly; and snacks consumption was negatively associated with the level of SOS(β=13.23, -0.47, P<0.05). Conclusion University stage is still the critical period of bone mass accumulation for female, snacks consumption may have a negative impact on bone health, so it is necessary to carry out nutrition education to help improve health awareness, promote health eating, and lead health lives to prevent osteoporosis.

Objective: To investigate the underlying influential factors related to emotional overeating behavior among college students,and to provide a reference for formulating intervention strategies for prevention of unhealthy eating behavior of college students. Methods: A questionnaire designed based on the social ecosystem theory was used to assess the potential influential factors of at personal, social, physical and macro level emotional overeating behavior of 2 045 college students. The Emotional Overeating Questionnaire was used to measure the frequency of emotional overeating behavior among normal weight college students. Binary Logistic regression analysis was performed to analyze the association between dietary norms and the influence emotional overeating behaviors. Results: In the full adjusted model, dietary norms (OR=1.28,95%CI=1.16-1.41)，emotion scale (OR=1.46, 95%CI=1.24-1.73) and close friends attitude(OR=0.75, 95%CI=0.59-0.95)were associated with emotional overeating behaviors. Sex, urban and rural origin, monthly living expenses, parental attitude, distance to frequent fast food restaurants outside the school, and the unmarked proportion of nutritional content and calorie information on food packaging were not associated with emotional overeating behaviors (P>0.05). Conclusion Dietary norms and emotion scale might increase the risk of motional overeating, close friends attitude might reduce the risk of emotional overeating. For reducing the frequency of unhealthy eating behavior, our results implied that 1) it s necessary to improve mental health of the college students; strengthening health education in order to make them distinguish the unhealthy dietary norms is important; peer education might be effective.

Objective: To understand the relationship between physical activity, depressive symptoms and eating disorders among college students, and to provide a theoretical basis for the intervention of eating disorders among college students. Methods: A questionnaire survey including International Physical Activity Questionnaire, Patient Health Questionnaire Depression Scale and Eating Attitude Test was administered among 2 712 college students from three universities. Results: Among the college students surveyed, 1 750(64.5%) did not meet the recommendations for physical activity, 962(35.5%) met the recommendation for physical activity; 488(18.0%) reported depressive symptoms, 452(16.7%) reported symptoms of eating disorders. There was a statistically significant difference in the incidence of eating disorders by genders, self-assessed learning pressure, physical activity and depressive symptoms(χ2=63.65, 23.17, 34.24, 70.66, P<0.05). After adjusting for demographic variables, the results of multiple Logistic regression analysis showed that physical activity and depressive symptoms were positively correlated with eating disorders(OR=1.59, 2.58, P<0.01). In the depression group, lower level of physical activity, was associated with higher rate of eating disorders. Conclusion Physical activity and depressive symptoms of college students were related to eating disorders. It is suggest that eating disorders might be alleviated by actively improving depressive symptoms and increasing physical activity.

Objective: To understand the health-related quality of life status of ethnic Korean children and adolescents and its relationship with social support and negative emotions, and to provide assistance to the healthy development of ethnic Korean children and adolescents. Methods: From April to June 2018 in Jilin Province, 4 024 ethnic Korean children and adolescents were selected for the survey of quality of life, social support, and negative emotion, and multiple linear regression analysis was used to understand the relationships between them. Results: The average score of the quality of life of ethnic Korean children and adolescents was (81.01±12.64)points. The average scores for school function, emotional function, social function and physiological function were (80.16±15.36) points, (73.07±19.85) points, (88.52±14.03) points and (82.65±14.17) points, respectively. Multiple linear regression analysis showed that the negative emotions of ethnic Korean primary and middle school students had a negative association with effect on quality of life (β=-0.24, P<0.01), social support had a positive predictive effect on quality of life (β=0.17, P<0.01), and the interaction between negative emotions and social support played a negative role in quality of life of ethnic Korean primary and middle school students (β =-0.19, P<0.01). Conclusion The health-related quality of life of ethnic Korean children and adolescents is acceptable. Social support can alleviate negative emotions to reduce the impact of negative emotions on quality of life.

Objective: This systematic review is performed to examine and summarize the effects of suicide gatekeeper training programs conducted in a school setting, with the aim to provide evidence for the construction of effective suicide prevention strategies on campuses. Methods: The Cochrane Library, PubMed, EMbase, Chinese Biomedical Literature Database(CBM), CNKI, Wanfang and Vip datebases were searched for randomized controlled trials on the training of suicide gatekeepers. Two researchers screened the literature according to the inclusion criteria, extracted the data, evaluated the quality. Then a qualitative description or quantitative synthesis strategy was adopted. Results: Among the 9 eligible studies, a number of different types of gatekeeper training programs were identified, including Question, Persuade and Refer(QPR), Sources of Strength(SOS) based on peer support, the Youth Aware of Mental Health Program(YAM), and Screening by Professionals(Prof Screen) and other training approaches. These training programs, to various degrees, have improved trainees knowledge, attitude, self-efficacy. And YAM was effective in reducing the number of suicide attempts and severe suicidal ideation in school-based adolescents. Conclusion The current studies mainly focused on the short-term effects of suicide gatekeeper training programs(knowledge, attitude, and self-efficacy). Ideally future research should pay more attention to the long-term outcomes.