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Does Wearing A Helmet Save Lives.

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Does Wearing A Helmet Save Lives.

Old 08-17-09, 04:50 AM
  #126  
meanwhile
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Originally Posted by cyclezealot View Post
Don't know if it saved my life, but pretty sure once, it saved me from a concussion.
Which is a worthwhile result, definitely. Although regrettably there is evidence that indicates helmets may well extract a price for ameliorating minor injuries by making serious ones worse through increasing rotational effects, as well as making moderate injuries more likely through increasing the contact area for the head.

The main thing is to be informed and make a logical fact-based choice.

Last edited by meanwhile; 08-17-09 at 05:14 AM.
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Old 08-17-09, 06:41 AM
  #127  
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Originally Posted by cyclezealot View Post
Don't know if it saved my life, but pretty sure once, it saved me from a concussion.
from the wiki page:

"Most helmets provide no protection against rotational injury and may make it worse. "The major discovery is that the skull plays an important role in protecting against rotational acceleration," says Phillips. He says almost all head injuries involve not just a direct blow to the skull but also damage to blood vessels caused by the brain rotating within the skull.

"In mechanical terms, the head is an elliptical spheroid with a single universal joint, the neck. It is therefore almost impossible to hit it without causing it to rotate. The head tries to dampen these forces using a combination of built-in defences: the scalp, the hard skull and the cerebrospinal fluid beneath it. During an impact, the scalp acts as rotational shock absorber by both compressing and sliding over the skull. This absorbs energy from the impact." [20]"


and from the concussion entry on wiki

"Concussion... is the most common type of traumatic brain injury. The terms mild brain injury, mild traumatic brain injury (MTBI), mild head injury (MHI), and minor head trauma and concussion may be used interchangeably...The brain is surrounded by cerebrospinal fluid, one of the functions of which is to protect it from light trauma, but more severe impacts or the forces associated with rapid acceleration may not be absorbed by this cushion...Forces may cause linear, rotational, or angular movement of the brain, or a combination of these types of motion.[5] In rotational movement, the head turns around its center of gravity, and in angular movement it turns on an axis other than its center of gravity.[5] The amount of rotational force is thought to be the major type of force to cause concussion[39] and the largest component in its severity.[6] Studies with athletes have shown that the amount of force and the location of the impact are not necessarily correlated to the severity of the concussion or its symptoms"

Last edited by closetbiker; 09-11-09 at 10:03 AM.
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Old 08-17-09, 09:10 AM
  #128  
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whilst the technology isnt quite there, i still think in the future these issues (i.e rotation) can be resolved and that in the long run helmets can save lives. we just need more research into develpment!
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Old 08-17-09, 09:22 AM
  #129  
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Originally Posted by exchangeandmart View Post
whilst the technology isnt quite there, i still think in the future these issues (i.e rotation) can be resolved and that in the long run helmets can save lives. we just need more research into develpment!
And what type of revelations in helmet design do you hope to see? There is a limit to what is humanly possible, as dictated by physics.

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Old 08-17-09, 09:48 AM
  #130  
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Originally Posted by exchangeandmart View Post
whilst the technology isnt quite there, i still think in the future these issues (i.e rotation) can be resolved and that in the long run helmets can save lives. we just need more research into develpment!
Reading your response, I can only conclude your current position is that helmets do prevent rotational injury and do not save lives
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Old 08-17-09, 10:21 AM
  #131  
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Truly, if I hear one more person write "helmet saved my life" I am going to scream! You sound like religious people saying god saved their life because they prayed!

Human perception is extremely fallible, people see spaceships and ghosts and angels, people demonstrate huge failure rates in facial recognition in criminal line-ups for their own race, more so with different races, among many other examples.

The only way a human can truthfully say "helmet saved my life" is if you had the option of reliving the moment without the helmet and seeing the alternative outcome. Otherwise you statements are completely empty, null and void. People survive falling out of planes and out of high windows, people also die tripping on the corners of their rugs in their homes.

Too many modern day humans are willing to pay good dollars for the illusion of guarantee of extending their lives. Basically, living your life in absolute fear of death. And worse yet, convincing governments that they are responsible for enforcing this national obsession. What a pity.
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Old 08-17-09, 01:22 PM
  #132  
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Even if they upped the force level a bike helmet could protect at, one of the big problems IMO is a direct impact. Motorcycle helmets are good for a 15 MPH direct impact rather than the 12 MPH of the bike helmet I believe. At 15 MPH body impact speed, per what I have read, a direct impact on the top of the head will normally break your neck as the body decelerates behind the head and neck.

Current auto racing safety technology includes fitted seats, 5 point safety harnesses and HANS devices as well as rollbars and safety cages in the car. These are mostly designed to help reduce body movement and both head and body impacts with the vehicle structure in a accident. The HANS device reduces head whiplash and basal skull fracture danger. So even in a car it takes multiple safety devices to protect the driver. Nascar and some other racing organizations have also mandated "soft walls" at most tracks to also reduce impact G forces the driver receives. Still not totally satisfactory for open cockpit cars as the recent accident of Felipe Massa and the death of Henry Surtees from head impacts with debris show.

None would work on a bike. I can see riding a bike with roll cage, body restraints etc. Not interested thank you.

Motorcycle helmets are hard shell and relatively smooth surfaced compared to bike helmets. This could possibly reduce the risk of rotational injuries as the helmet seems like it would be more inclined to skid along the impact surface than dig in, reducing the chance of rotational injuries. Be like wearing an oven however and I doubt if they could be sold to most bicyclists.

No easy solution it seems but the evidence seems to indicate that bike helmets have a minimal effect on head injury related deaths. They may save people from head abrasions and some concussions but may actually increase rotational injuries. Not a satisfactory product it seems and to legislate their mandatory use as a lifesaving device seems to be stupid, or at least badly misinformed.
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