Cumulative effects of soccer heading are not fully known

EDITOR—McCrory says in his editorial that heading a soccer ball results in head accelerations of less than 10 g (or less than 1000 rad/s2), whereas the minimum values for the development of sports related concussions are 40-60 g (or 3500-5000 rad/s2),1 with a reference to an article published by our group. To mix or equate linear acceleration measured in g (1 g = 9.8 m/s2) with angular acceleration …