Dynamic fronto- occipital head loading of helmet- protected cadavers.

Eleven dynamic fronto- occipital impact tests on helmet- protected cadavers were conducted with a deceleration trolley to which a quasi- rigid wall was installed. Discreet skull injuries were detected in only two cases. Injury to the brain could not be found but cannot be excluded in view of the test object. All the full- faced safety helmets used were of the same type and manufacture. The polycarbonate outer shell did not break in any of the tests. The polystyrol inner liner showed plastic compressions of a maximum of 30% of the thickness of the damping liner at .contact point.