Relationship of Leisure-Time Physical Activity and Mortality

Context.—Physical activity and fitness are believed to reduce premature mortality, but whether genetic factors modify this effect is not known.Objective.—To investigate leisure physical activity and mortality with respect to familial aggregation of health habits during childhood and factors that may enable some individuals to achieve higher levels of fitness.Design.—Prospective twin cohort study.Setting.—Finland.Subjects.—In 1975, at baseline,...