To explore the isotemporal substitution effects among different intensities of physical activity within a 10-minute recess period on the mental health of junior high school students, aiming to provide evidence-based references for targeted practical interventions.

From May to November 2024, a total of 845 junior high school students from Tianjin, Taiyuan and LV Liang in Shaanxi Province, Puyang in Henan Province, Xi'an in Shaanxi Province, Quzhou in Zhejiang Province, and Chaoyang in Liaoning Province were selected by using a combination of stratified random sampling and convenience sampling. ActiGraph wGT3X-BT accelerometers was used to measure physical activity during a 10-minute recess period. Mental health status was assessed with the Depression Anxiety Stress Scale (DASS-21). An isotemporal substitution model was constructed in 1-minute increments to predict the effects of substituting different physical activity behaviors on students' mental health.

During recess, sedentary behavior (SB) was predominant among junior high school students, with an average duration of [7.08(5.85, 7.98)] minutes, while moderate-to-vigorous physical activity (MVPA) accounted for the shortest duration at [0.42(0.21, 0.85)] minutes. There were statistically significant differences in MVPA, LPA and SB time between students of different genders and grades(Z/H=-9.08, -8.34, -9.51;84.87, 126.82, 135.27, all P < 0.01). Isotemporal substitution analysis, adjusted for gender and age, showed that replacing 1 minute of SB with 1 minute of MVPA significantly improved anxiety levels (β=-0.29, 95%CI=-0.53 to -0.04) and overall mental health (β=-0.72, 95%CI=-1.39 to -0.04), with both results reaching statistical significance (both P < 0.05). No significant effects were observed for other substitution patterns (both P>0.05).

Substituting SB with MVPA during a 10-minute recess period exerts a positive impact on the mental health of junior high school students. It is recommended to optimize the daily recess activity structure in schools to enhance students' mental well-being.

To explore the relationship between beverage dependence and sleep quality among college students, providing empirical evidence for improving their sleep quality.

From December 2024 to January 2025, a convenience sampling method was used to conduct a questionnaire survey among 3 974 college students from four universities in Anhui Province. The Beverage Addiction Scale for College Students (BASCS) was used to assess beverage dependence, and the Self-rating Scale of Sleep(SRSS) was used to evaluate sleep quality. A multivariate Logistic regression model was employed to analyze the relationship between beverage dependence and sleep quality, and a restricted cubic spline model was used to examine the dose-response relationship between the two.

The positive rate of beverage dependence symptoms among college students was 7.6%, with positive rates of 9.6%, 13.8%, and 7.4% for the withdrawal symptoms, health effects, and dependence symptoms dimensions, respectively. The detection rate of sleep disorders was 23.6%. Multivariate Logistic regression analysis showed that after adjusting for covariates such as grade, gender, and body mass index, compared with the no beverage dependence group, students with positive beverage dependence symptoms had a higher risk of sleep disorders(OR=3.71, 95%CI=2.87-4.80, P < 0.01). The OR(95%CI) for sleep disorders among students with positive symptoms in the withdrawal symptoms, health effects, and dependence symptoms dimensions were 2.80(2.22-3.53), 2.38(1.95-2.91), and 2.45(1.89-3.18)(all P < 0.01). Further analysis using a restricted cubic spline model revealed that the overall beverage dependence score and its three dimensional scores were approximately linearly related to the risk of sleep disorders among college students (all nonlinear P>0.05).

Beverage dependence is associated with sleep quality among college students. Schools should take multiple approaches, such as health education on beverage awareness, to improve students' sleep quality.

To explore the relationship between the parent-child relationship perceived by parents and students of junior high school and students' internalization problems, so as to provide a pathway for the prevention and control of students' internalization problems.

In June 2023, a convenience cluster sampling method and a matching method between students and their fathers/mothers were used to select 965 pairs of students and their fathers (or mothers) from three junior high schools in Guizhou Province, and the Middle School Student's Parent-Child Relationship Questionnaire (parent and student edition) and the Strengths and Difficulties Questionnaire (student edition) were used to measure the perception of parent-child relationship by parents and students and the internalization problems of students. The response surface analysis method was used to analyze the relationships between parents' and students' perceptions of parent-child relationship and students' internalization problems.

The comparison of standardized scores revealed that 58.44% of parents and junior high school students had different perceptions of parent-child relationship. After controlling for students' gender, students' grade, and parents' education level, the results showed that when the parent-child relationship perceived by parents and students was congruent, the students' internalization problems increased with the decrease of parent-child relationship level (a₁=-0.43, 95%CI=-0.62 to -0.25, P < 0.05). When the parent-child relationship perceived by parents and students was incongruent, and the parent-child relationship perceived by parents was higher than that of students, students' internalization problems were more (a₃=-0.36, 95%CI=-0.51 to -0.19, P < 0.05).

Students' internalization problems are closely related to perceptions of parent-child relationship. Improving the quality of the parent-child relationship and paying attention to the differences in perception of the parent-child relationship are helpful for evaluating and intervening in the internalization problems of junior high school students.

To examine the association between parent-child relationships and bullying behaviors among junior high school students, and to explore the moderating effect of community cohesion, so as to provide evidences for bullying intervention strategies.

From November to December 2017, a cluster sampling method was used to survey 1 589 students in grades 6-8 from three junior high schools in Jing'an District, Shanghai. Anonymous electronic questionnaires collected data on parent-child relationships, community cohesion, and bullying behaviors. Multivariate Logistic regression analyzed the associations and moderation effects.

The prevalence of bullying behaviors among junior high school students was 7.80%. Spearman correlation analysis revealed negative associations between both parent-child relationships (r=-0.13) and community cohesion (r=-0.10) with bullying behaviors, while parent-child relationships positively correlated with community cohesion (r=0.29) (all P < 0.01). Junior high school students with positive parent-child relationships and higher perceived community cohesion showed lower risks of bullying behaviors (OR=0.51, 95%CI=0.36-0.72; OR=0.58, 95%CI=0.45-0.76), with a significant interaction effect between the two factors (all P < 0.05).

Positive parent-child relationships and community cohesion are negatively associated with bullying behaviors in middle school students. Supportive family relationships help reduce bullying, while stronger community cohesion enhances the protective effect of positive parent-child relationships against bullying.

To analyze the influence of stress and psychological resilience on the dietary behavior of middle school students so as to privide a basis for the development of policies and interventions aimed at improving middle school students dietary behavior.

A total of 8 874 middle school students in Shanghai were surveyed using stratified cluster random sampling method from November 2019 to January 2020. The questionnaire included general information, dietary behavior, Perceived Stress Scale (PSS-10) and Connor-Davidson Resilience Scale (CD-RISC-10). Factor analysis was used to analyze the dietary behavior model. Logistic regression model was used to explore the correlation between stress, psychological resilience and dietary behavior in adolescents. Besides, a structural equation model was established to analyze the mediating effect of psychological resilience on stress and dietary behavior.

The total score of psychological resilience among middle school students was (27.99±9.83), and the total score of stress was (25.56±7.06). Factor analysis categorized dietary behavior into two types: the high-energy dietary behavior and balanced dietary behavior. High-energy dietary behavior exhibited statistically significant differences across genders and schooling stage (χ²=41.37, 204.03), while balanced dietary behavior showed statistically significant differences across schooling stage and socioeconomic status (χ²=130.23, 96.53) (all P < 0.01). Logistic regression analysis showed that adolescents with moderate and high stress levels had an increased risks of high-energy dietary behavior (OR=1.25, 95%CI=1.12-1.39; OR=1.58, 95%CI=1.39-1.79) and a reduced likelihood of reduced balanced dietary behavior (OR=0.73, 95%CI=0.65-0.81; OR=0.53, 95%CI=0.47-0.60); adolescents with high levels of psychological resilience had a decreased risk of high-energy dietary behavior (OR=0.73, 95%CI=0.65-0.83), and those with moderate and high resilience levels showed improved balanced dietary behavior (OR=1.45, 95%CI=1.29-1.62; OR=2.50, 95%CI=2.21-2.84) (all P < 0.01). The mediating effect of psychological resilience between stress and high-energy dietary behavior or balanced dietary behavior accounted for 15.61% and 56.10% of the total effects, respectively.

Stress and psychological resilience are the influencing factors of dietary behavior in middle school students. Psychological resilience have a partial mediating effect between stress and high-energy dietary behavior or balanced dietary behavior.

To explore effects of cumulative family risk in university students on individuals' internalizing problems, to elucidate the mediating roles of perceived social support and self-esteem in the relationship, so as to provide a basis for promoting university student's mental health.

Using longitudinal design, 1 207 freshmen from a university in Tianjin were randomly selected and surveyed in November 2023 (T1) and November 2024 (T2). The instruments included the Cumulative Family Risk Scale, the Perceived Social Support Scale, the Self-esteem Scale, and the College Student Mental Health Screening Scale. Structural equation modeling (SEM) was constructed, with Bootstrap method used to test mediating effects and to examine gender differences.

The results showed that cumulative family risk at T1 with internalizing problems at T1(r=0.30) and internalizing problems at T2 (r=0.32) were significantly positively correlated (both P < 0.01). Mediation analysis indicated that the independent mediating effect of perceived social support at T1, cumulative family risk at T1 and internalizing problems at T2 was 0.03 (95%CI=0.02-0.05), and the independent mediating effect of self-esteem at T1 was 0.08 (95%CI=0.06-0.10) (both P < 0.05). The chain mediating effect of perceived social support and self-esteem at T1 was 0.02 (95%CI=0.02-0.03) (P < 0.05). Significant gender differences were observed in the path from cumulative family risk to self-esteem (β_male=-0.24, β_female=-0.35) and in the path from perceived social support to self-esteem (β_male=0.41, β_female=0.25) (all P < 0.05).

Cumulative family risk reduces internalizing behaviors in university students via internal and external development resources, with gender-specific mechanisms.

To understand the association of physical exercise willingness and insomnia with depressive symptoms among college students, so as to provide reference for improving depressive symptoms of college students.

From October 2022 to April 2023, cluster sampling was used to recruit 11 101 college students from four colleges in Anhui Province. The questionnaire survey was conducted to investigate the willingness to engage in physical exercise, insomnia and depressive symptoms of college students. The multivariate Logistic regression model was used to analyze the association of physical exercise willingness and insomnia with depressive symptoms of college students.

The prevalence of depressive symptoms among college students was 9.24%. Multivariate Logistic regression analysis showed that college students who were passive participants/non-participants in physical activity, or who experienced insomnia, had a higher likelihood of depressive symptoms compared to those who were active participants or did not experience insomnia (OR=1.84, 2.07, 4.02, all P < 0.01). College students who were passive participants or non-participants in physical activity and concurrently experienced insomnia had a higher risk of depressive symptoms compared with those who were active participants or did not experience insomnia (OR=1.87-8.39, all P < 0.01). Gender stratified analysis showed that the combined effect of passive physical exercise and insomnia increased the risk of depressive symptoms in both male (OR=1.81-9.87) and female college students (OR=1.67-7.39) (all P < 0.05).

Both physical exercise willingness and insomnia are associated with depressive symptoms in college students. In order to improve the depressive symptoms of college students, it is necessary to improve the enthusiasm of physical exercise and strengthen the education of sleep health awareness.

To explore the application effect of a guided self-help intervention based on dialectical behavior therapy (DBT) to address non-suicidal self-injury (NSSI) behavior among college students, so as to provide a reference for reducing the occurrence of NSSI behavior in this population.

A total of 106 college students with NSSI admitted to the Department of Child and Adolescent Psychology, the Second Affiliated Hospital of Jining Medical University from January 2021 to January 2023 were selected and divided into an observation group and a control group, with 53 cases in each group, using a random number table method. The control group received routine medication treatment and psychological intervention, while the observation group, on the basis of the interventions provided to the control group, implemented dialectical behavior therapy-based guided self-help. The approach combines group activities, individual counseling, and self-directed learning, covering four core modules: mindfulness training, distress tolerance, interpersonal effectiveness, and emotion regulation. Meanwhile, data collection, skill check-ins, and personalized recommendation pushes were conducted through a WeChat. Both groups were intervented for 12 weeks. Before the intervention and after the intervention, the Adolescent Non-suicidal Self-injury Behavior Questionnaire, Ottawa Self-injury Inventory (OSI), and Barratt Impulsiveness Scale (BIS) were used to evaluate the patients, and the levels of serum neurotransmitters were detected. The χ² test, t test, and Cochran's Q test were used for data comparison and analysis.

The incidence rates of NSSI in the observation group after 3, 6, and 12 weeks of intervention were 47.17%, 16.98%, and 5.66%, respectively, all lower than those in the control group (67.92%, 35.85%, 20.75%) (χ²=4.67, 4.85, 5.27, all P < 0.05). After 12 weeks of intervention, in the NSSI Behavior Questionnaire, the total score of the observation group was (17.94±2.69) points, which was lower than that of the control group (23.04±5.11) points; in the Function Questionnaire, the total score of the observation group was (53.24±8.94) points, which was higher than that of the control group (47.74±8.00) points(both P < 0.05). In terms of the OSI, the total score of the observation group was (4.49±0.62) points, lower than that of the control group (6.25±0.81) points; in the BIS, the total score of the observation group was (80.76±7.94) points, lower than that of the control group (87.74±9.34) points, and the differences between groups were statistically significant(both P < 0.05). After the intervention, the level of 5-hydroxytryptamine in the observation group was (67.93±5.42) ng/mL, higher than (44.72±5.54) ng/mL of the control group; the levels of substance P and cortisol in the observation group were (35.82±4.47) ng/L and (75.64±8.02) μg/L, respectively, both lower than (48.14±5.32) ng/L and (94.53±10.78) μg/L of the control group, and the differences were statistically significant (all P < 0.05).

The guided self-help intervention based on DBT is helpful for reducing NSSI behavior among college students.

To examine the associations of pet ownership and daily outdoor activity duration with depressive symptoms in middle school students, so as to provide evidence for targeted prevention strategies of depressive symptoms in middle school students.

Using a stratified cluster random sampling method, 83 601 middle and high school students from 103 districts and counties in Inner Mongolia Autonomous Region were selected in 2024. A questionnaire survey was conducted to collect demographic data, household pet ownership, outdoor activity duration, and depressive symptoms of the research subjects. The comparison of reporting rates of depressive symptoms among different groups of middle school students was conducted using a χ² test. The association between pet ownership and outdoor activity duration and depressive symptoms among middle school students was evaluated using a Logistic regression model, and stratified analysis was conducted among different genders and regions to control for potential confounding factors and evaluate the stability of the association.

The prevalence of depressive symptoms among middle-school students in Inner Mongolia was 17.2%. Significant differences in depressive symptom reporting rates were observed across sex, grade, ethnicity, surveillance site, parental education, menarche/spermarche status, boarding status, smoking and alcohol use, daily breakfast consumption, school bullying, continuous 30-minute headphone use in a noisy environment, and often use the Internet (χ²=8.07-2 672.57, all P < 0.01). Both pet ownership (OR=0.78, 95%CI=0.75-0.81) and ≥2 h/d of outdoor activity(OR=0.81, 95%CI=0.78-0.84) were inversely associated with depressive symptoms; compared to the without owning pets and < 2 h of outdoor activity daily group, students who both owned pets and engaged in ≥2 h of outdoor activity daily had an even lower risk (OR=0.83, 95%CI=0.78-0.87)(all P < 0.05).

Pet ownership and increased daily outdoor activity duration may help mitigate depressive symptoms among middle school students.

To analyze the association between poor sleep characteristics and the coexistence of negative emotions and overweight/obesity among college students, so as to provide a scientific basis for improving their physical and mental health.

From November to December 2023, a convenience sampling method was used to survey 6 600 college students from nine universities in Jiangxi, Hunan, and Hubei provinces. The Depression Anxiety and Stress Scale-21 (DASS-21), Insomnia Severity Index (ISI), Pittsburgh Sleep Quality Index (PSQI), and physical examinations were employed to assess negative emotions, poor sleep characteristics, and overweight/obesity. Chi-square test and Logistic regression were used to analyze the impact of poor sleep characteristics on the coexistence of negative emotions and overweight/obesity.

The coexistence rates of different categories of negative emotions (depression, anxiety, stress) and overweight/obesity were 6.1% (n=405), 8.0% (n=529), and 3.3% (n=217), respectively. Gender, grade level, major, maternal education level, annual family income, physical activity level, only-child status, and carbonated beverage consumption were statistically associated with the coexistence rates of different categories of negative emotions and overweight/obesity (χ²=4.01-35.18, all P < 0.05). Logistic regression analysis showed that after adjusting for gender, grade level, major, only-child status, maternal education level, annual family income, physical activity level, and carbonated beverage consumption, poor sleep characteristics were significantly associated with an increased risk of the coexistence of negative emotions and overweight/obesity (OR=1.41-6.65); moderate and poor sleep quality levels were significantly associated with an increased risk of the coexistence of different categories of negative emotions and overweight/obesity among female students (OR=1.99-4.71) (all P < 0.05).

Poor sleep characteristics are associated with the coexistence of negative emotions and overweight/obesity among college students. Greater attention should be paid to sleep issues in this population, and sleep education should be actively promoted to reduce the risk of comorbid negative emotions and overweight/obesity.