Age and gender disparities in joint associations of physical activity and sleep duration with depressive symptoms trajectories: a longitudinal analysis of Chinese middle-aged and older adults

Objectives The combined effects of physical activity and sleep duration on depressive symptoms trajectories, and age and gender disparities remain inadequately understood. The objective of this study was to identify the joint relationship of physical activity and sleep duration with depressive symptoms trajectories in Chinese middle-aged and older adults, and explored disparities in the joint associations.