Samenvatting
The crash helmet which provides protection against injury due to direct head impact may actually contribute to injury in indirect head impact situations, because of the added mass of the helmet on the head/neck system. It has been suggested that it may be possible to reduce this hyperflexion/hyperextension injury hazard while retaining the beneficial protection against direct impact through use of helmet restraining collors, such as styrofoam or inflatable airbags.