Quote Originally Posted by alison_in_oh
Last night my husband was sprinting at faster than 30 mph, had some kind of small equipment malfunction, went over the bars and hit the pavement. Thanks to his helmet, he had a small bruise on his temple and maybe a mild concussion.

That's the kind of injury that a helmet is meant to protect against. Not a full-speed collision with a concrete post. The human body just can't sustain that regardless of protective gear.
that is exactly right. It's physics and mechanism of injury. A body in motion will stay in motion, and unfortunately when a body in motion hits something stationary at certain speeds, it destroys bone and tissue in an instant, regardess of what happens to the brain upon impact.

Irulan