[SystemSafety] Bicycle Helmets

[Martyn Thomas]

I recall reading some time ago that helmets can translate an impact that the skull has evolved to handle into a rapid rotation of the head that does far more damage. 

Martyn Thomas
iPhone

> On 15 Oct 2014, at 21:30, Matthew Squair <mattsquair at gmail.com> wrote:
> 
> Likewise I have a bicyclist friend who was hit by a car and her helmet saved her from severe brain trauma. 
> 
> This was her second bad concussion from riding within the space of a couple of months, and as we found out the only thing the brain likes less than being shaken vigorously is having it done again. 
> 
> Fuzziness of the data notwithstanding, if we agree that helmets provide say '-x' degree of risk reduction, but in the two populations the proportion of injuries is still roughly the same, then we could conclude there must be some source of additional risk equal to 'x' that helmeted riders are exposed to? If so what is that risk? Or am I missing something?
> 
> Matthew Squair
> 
> MIEAust, CPEng
> Mob: +61 488770655
> Email; Mattsquair at gmail.com
> Web: http://criticaluncertainties.com
> 
>> On 15 Oct 2014, at 6:52 am, Peter Bernard Ladkin <ladkin at rvs.uni-bielefeld.de> wrote:
>> 
>> 
>> 
>>> On 2014-10-15 00:01 , David Crocker wrote:
>>> I have some indirect experience of the value of cycle helmets.
>> 
>> David's story is similar to what happened in one of the two incidents to my friend who wrecked two
>> helmets and her jaw, but in her case it was a lamppost base.
>> 
>> That's the puzzle. The value of helmets is obvious - many of us seem to know some one or more whose
>> lives have been saved - but apparently not from the numbers.
>> 
>> PBL
>> 
>> Prof. Peter Bernard Ladkin, Faculty of Technology, University of Bielefeld, 33594 Bielefeld, Germany
>> Tel+msg +49 (0)521 880 7319  www.rvs.uni-bielefeld.de
>> 
>> 
>> 
>> 
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