FIGURE 29 The Stanford Runners Study. This study measured the probability of surviving in a given year (top) and disability (bottom) over two decades in a group of amateur runners over fifty in 1984 compared with a group of healthy but sedentary controls. After more than twenty years the runners had 20 percent higher survival rates and 50 percent less disability. (Modified with permission from Chakravarty, E. F., et al. [2008], Reduced disability and mortality among aging runners: a 21-year longitudinal study. Archives of Internal Medicine 168:1638–46)
