#21
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Helmets
Just zis Guy, you know? wrote:
On Wed, 05 Aug 2009 13:04:14 +0100, Bod wrote: But competition BMX-ers wear something similar to M/cycle crash helmets. No they don't. Weigh them some time. Guy I assume you mean they are a lot lighter? |
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#22
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Helmets
On Wed, 05 Aug 2009 15:02:26 +0100, Bod
wrote: Just zis Guy, you know? wrote: On Wed, 05 Aug 2009 13:04:14 +0100, Bod wrote: But competition BMX-ers wear something similar to M/cycle crash helmets. No they don't. Weigh them some time. Guy I assume you mean they are a lot lighter? That is certainly the case. Most M/C helmets weigh between 1.5 and 2kg whereas, afaict, full-face BMX ones are around 1kg. They're clearly closer in concept to a M/C helmet than to a painted foam one, though. |
#23
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Helmets
Ace wrote:
On Wed, 05 Aug 2009 15:02:26 +0100, Bod wrote: Just zis Guy, you know? wrote: On Wed, 05 Aug 2009 13:04:14 +0100, Bod wrote: But competition BMX-ers wear something similar to M/cycle crash helmets. No they don't. Weigh them some time. Guy I assume you mean they are a lot lighter? That is certainly the case. Most M/C helmets weigh between 1.5 and 2kg whereas, afaict, full-face BMX ones are around 1kg. They're clearly closer in concept to a M/C helmet than to a painted foam one, though. I see. |
#24
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Helmets
On Aug 5, 6:00*am, Toom Tabard wrote:
On 5 Aug, 11:08, "Just zis Guy, you know?" wrote: On Wed, 05 Aug 2009 10:48:16 +0100, Peter Clinch wrote: I wonder, why on earth did he wear that silly helmet? Probably something to do with driving a very powerful racing car at around 200 mph, at a first guess. I believe that competition motorsport helmets would be effective in mitigating the forces experienced in some (not all) collisions between motor vehicles and cyclists, in a way that cycle helmets are not. *I don't much fancy wearing one while cycling, though, and the cost would be prohibitive anyway. A motorsports helmet is of course of a robust design. But in collisions between motor vehicles and cyclist, where the cyclist bangs his head, a cycle helmet may in many circumstances prevent or mitigate the degree of head injury, sometime to crucial degree in terms of future motor and cognitive functioning of the cyclist. How could it be otherwise? Toom Because standard cycle helmets are not designed, constructed or tested to withstand impacts with a car. Their functional range is limited to a simple fall from about 6 feet, that's it. If you want to wear a bicycle helmet that may be of some use in a collision with a motor vehicle may I suggest a DOT approved DH lid ... http://www.sixsixone.com/Catalog_661...a-89252ac07f0c |
#25
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Helmets
Toom Tabard wrote:
A motorsports helmet is of course of a robust design. But in collisions between motor vehicles and cyclist, where the cyclist bangs his head, a cycle helmet may in many circumstances prevent or mitigate the degree of head injury, sometime to crucial degree in terms of future motor and cognitive functioning of the cyclist. How could it be otherwise? The exact mechanism? I don't know... .... but I do know that outside of poorly constructed case-control studies there is a distinct lack of evidence that that's what happens, however that might happen. And where anyone's looked at the rates of serious head injury with rising helmet wearing rates, there's been *no* clear benefit. If it "couldn't be otherwise" that shouldn't be the case. But it is. Pete. -- Peter Clinch Medical Physics IT Officer Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital Fax 44 1382 640177 Dundee DD1 9SY Scotland UK net http://www.dundee.ac.uk/~pjclinch/ |
#26
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Helmets
On 5 Aug, 13:05, Simon Brooke wrote:
On 5 Aug, 12:00, Toom Tabard wrote: On 5 Aug, 11:08, "Just zis Guy, you know?" wrote: On Wed, 05 Aug 2009 10:48:16 +0100, Peter Clinch wrote: I wonder, why on earth did he wear that silly helmet? Probably something to do with driving a very powerful racing car at around 200 mph, at a first guess. I believe that competition motorsport helmets would be effective in mitigating the forces experienced in some (not all) collisions between motor vehicles and cyclists, in a way that cycle helmets are not. *I don't much fancy wearing one while cycling, though, and the cost would be prohibitive anyway. A motorsports helmet is of course of a robust design. But in collisions between motor vehicles and cyclist, where the cyclist bangs his head, a cycle helmet may in many circumstances prevent or mitigate the degree of head injury. Have you /any/ evidence of that at all? If so, we'd all be very pleased to hear it.- Hide quoted text - You clipped the last line of my message which said How could it be otherwise? Perhaps you could explain why it is not the case that in collisions between motor vehicles and cyclist, where the cyclist bangs his head, a cycle helmet may in many circumstances prevent or mitigate the degree of head injury. You'll find there are many circumstances where they prevent or mitigate injury in such accidents - enquire at any ambulance station, A&E, head trauma unit, etc. Toom |
#27
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Helmets
Happi Monday wrote:
Now that Massa is out of hospital and doing OK...... I wonder, why on earth did he wear that silly helmet? How about for the same reason the TdF riders do, because the governign body says he has to? Or Because his Safety system clips to it? 'Cos his radio mic and earphones are in it? 'cos his oxygen supply is piped through it? 'Cos his drinks tube is in there? 'Cos otherwise Trolls coudn't ask stupid OT questions? |
#28
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Helmets
On 5 Aug, 16:39, Marz wrote:
On Aug 5, 6:00*am, Toom Tabard wrote: On 5 Aug, 11:08, "Just zis Guy, you know?" wrote: On Wed, 05 Aug 2009 10:48:16 +0100, Peter Clinch wrote: I wonder, why on earth did he wear that silly helmet? Probably something to do with driving a very powerful racing car at around 200 mph, at a first guess. I believe that competition motorsport helmets would be effective in mitigating the forces experienced in some (not all) collisions between motor vehicles and cyclists, in a way that cycle helmets are not. *I don't much fancy wearing one while cycling, though, and the cost would be prohibitive anyway. A motorsports helmet is of course of a robust design. But in collisions between motor vehicles and cyclist, where the cyclist bangs his head, a cycle helmet may in many circumstances prevent or mitigate the degree of head injury, sometime to crucial degree in terms of future motor and cognitive functioning of the cyclist. How could it be otherwise? Toom Because standard cycle helmets are not designed, constructed or tested to withstand impacts with a car. Their functional range is limited to a simple fall from about 6 feet, that's it. If you want to wear a bicycle helmet that may be of some use in a collision with a motor vehicle may I suggest a DOT approved DH lid ...http://www.sixsixone.com/Catalog_661...ccb-4456-b...- Hide quoted text - They are tested to withstand a particular impact in designated circumstances. That does not mean they won't function to that level of protection in other circumstances of head impact. In many impacts with a car much of the energy is absorbed in body and limb impact as well as the head. The helmet will provide protect up to, and to an extent sometimes well beyond the minimum, and depending on the head velocity in the particular impact will in many cases avoid or mitigate injury. The head is particularly important to protect. Bones and soft body tissue can heal and restore fairly full functionality. There is not the same recovery level with brain tissue trauma and there can be permanent and severe loss of cognitive and motor function. A helmet can make a crucial difference in this respect in many collisions. Toom |
#29
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Helmets
I wasted some time this afternoon writing a post heavy with sarcasm purporting to express the view that it was a credit to our collective wit that a parody of a weak trolling post brought about parodic weak responses to a troll. Looking back over the thread I decided that the replies really were parodies and that I was the po-faced one. I canceled that post, but now I'm beginning to think that I should have let it stand. I could be wrong. -- Roger Thorpe Standing on a golf course, dressed in PVC..... |
#30
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Helmets
On 5 Aug, 13:33, Peter Grange wrote:
On Wed, 05 Aug 2009 14:13:40 +0200, Ace wrote: On Wed, 5 Aug 2009 05:05:04 -0700 (PDT), Simon Brooke wrote: On 5 Aug, 12:00, Toom Tabard wrote: A motorsports helmet is of course of a robust design. But in collisions between motor vehicles and cyclist, where the cyclist bangs his head, a cycle helmet may in many circumstances prevent or mitigate the degree of head injury. Have you /any/ evidence of that at all? If so, we'd all be very pleased to hear it. "It's obvious." Out of my window I can see all the way to the end of the road. From where I sit it's obvious the world is flat, innit. And for all practical purposes within that range, and for a good bit beyond, it can be regarded as flat and will function as such. Just as for for head impact at velocities within the design range of the helmet, and a good bit beyond, the helmet protection will function as such. An excellent analogy. Many thanks. Toom |
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