Effect of Long-Duration Impact on Head 720956

Impacts have been analyzed in terms of degree of injury, head injury criterion (HIC), and average acceleration as a function of time for frontal impacts against the following surfaces:
  1. 1.
    Rigid flat surface-fractured cadaver skull.
  2. 2.
    Astroturf-head drop of football-helmeted cadaver.
  3. 3.
    Windshield penetrating impact of a dummy.
  4. 4.
    Airbag-dynamic test by human volunteers.
It is concluded that the linear acceleration/time concussion tolerance curve may not exist and that only impacts against relatively stiff surfaces producing impulses with short rise times can be critical. The authors hypothesize that if a head impact does not contain a critical HIC interval of less than 0.015 s, it should be considered safe as far as cerebral concussion is concerned.


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