Qinyu Zhang's scientific contributions

This study was conducted to examine the relationships among physical activity, perceived social support and hope in the group of rural left-behind children. It was found that physical activity can not only directly and positively predict the level of hope in rural left-behind children. It can also indirectly predict their sense of hope through perceived social support. Moreover, perceived social support was found to have a mediating effect on the relationship between physical activity and hope in rural left-behind children. These findings can deepen the understanding of left-behind children's sense of hope and have important implications for maintaining and improving rural left-behind children's mental health.

The relationship between physical activity time, openness and depression symptoms among adolescents is a cutting-edge research direction in the field, yet it remains unclear. This study is based on a sample of 7924 students from a nationally representative China Education Panel Survey database and examines the bidirectional relationships between physical activity time, openness and depression symptoms among Chinese adolescents. Descriptive analysis showed that during the 7th and 8th grades, the average physical activity time decreased to less than one hour per day, accompanied by a decreasing trend in openness and a slight worsening in depression symptoms. Correlation analysis showed a significant negative correlation between physical activity time and depression symptoms, a significant positive correlation between physical activity time and openness, and a significant negative correlation between depression symptoms and openness. The results from cross-lagged models indicated a bidirectional relationship between physical activity time and openness, with physical activity time significantly positively predicting openness in the following year and openness significantly positively predicting physical activity time in the following year. In addition, depression symptoms had a unidirectional negative predictive effect on openness. The conclusions provide empirical evidence for education administration and schools to promote the physical and mental health development of adolescents worldwide.