The reciprocal relationship between prosocial behaviour and self-perceived physical health: The role of positive affect and openness to experience.

The present study used a cross-lagged design to explore the bidirectional relationship between adolescents' prosocial behaviour and self-perceived physical health and to explore the mediating role of positive affect and the moderating role of openness to experience. A total of 1525 middle school students ( M age  = 12.41, 47% male) in northern China were surveyed for 3 years. The results showed the following: (1) prosocial behaviour at T1 positively predicted self-perceived physical health at T3; and vice versa; and (2) this observed relation between prosocial behaviour and self-perceived physical health was explained by positive affect; (3) the mediating role of positive affect on the path from prosocial behaviour at T1 to self-perceived physical health at T3 was observed only among adolescents with high openness traits. This finding verified the protective effect of prosocial behaviour on the healthy development of the actor.