Frontiers in Public Health
More is not always better: longitudinal associations and nonlinear dose–response relationships between physical activity, psychological capital, and positive body image among Chinese university students
Objective This study examined the longitudinal associations between physical activity (PA), psychological capital (PsyCap), and positive body image, operationalized as body appreciation, among Chinese university students. We further evaluated the mediating role of PsyCap and explored potential nonlinear dose–response relationships between different dimensions of PA and body appreciation. Methods A two-wave longitudinal survey with a three-month interval was conducted among 669 university students from four universi …