Figure 2.

A) Lower extremity effective load ratings for common physical activities, with higher load ratings being representative of a greater bone osteogenic stimulus. Effective load ratings were estimated from the magnitude and rate of ground reaction force generation during representative actions (or similar actions when reaction forces could not be directly measured). Data from Weeks and Beck.[86] B) Incidence of bone stress injuries (BSIs) in females and males across collegiate sports in the United States over a 10-year period. N/A = data not available. Data from Rizzone et al.[15]