FOOTBALL, NECK MUSCLES AND HEAD IMPACT

  • 1 January 1978
    • journal article
    • research article
    • Vol. 147  (4) , 513-517
Abstract
Any blow to the head may be injurious because it is the manner of response to the blow rather than the blow itself that produces the injury potential. Impacts to inanimate objects or to the heads of anesthetized animals produce data that are simplified by the fact that the involved mass is a constant and the contact time is consistently negligible. On the football field, all the muscles in the players'' body are tensed at the snap of the ball and the involved mass varies widely during the resulting prolonged contact time. This causes variable accelerations, variable forces and variable velocity changes and a varying mass which can only be measured according to the impulse momentum theorem, F[force] t .times.[time] = .DELTA.M[change in mass] .times. V[velocity].