Trajectories of self-reported physical activity and predictors during the transition to old age: a 20-year cohort study of British men
D. Aggio, E. Papachristou, E. Papachristou, O. Papacosta, L. Lennon, S. Ash, P. Whincup, S. Wannamethee, B. Jefferis
International Journal of Behavioral Nutrition and Physical Activity