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John Lloyd
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My research article "Brain Injury in Sports", co-authored with Dr. Frank Conidi has been published in the Journal of Neurosurgery.
Abstract

OBJECT
Helmets are used for sports, military, and transportation to protect against impact forces and associated injuries. The common belief among end users is that the helmet protects the whole head, including the brain. However, current consensus among biomechanists and sports neurologists indicates that helmets do not provide significant protection against concussion and brain injuries. In this paper the authors present existing scientific evidence on the mechanisms underlying traumatic head and brain injuries, along with a biomechanical evaluation of 21 current and retired football helmets.

METHODS
The National Operating Committee on Standards for Athletic Equipment (NOCSAE) standard test apparatus was modified and validated for impact testing of protective headwear to include the measurement of both linear and angular kinematics. From a drop height of 2.0 m onto a flat steel anvil, each football helmet was impacted 5 times in the occipital area.

RESULTS
Skull fracture risk was determined for each of the current varsity football helmets by calculating the percentage reduction in linear acceleration relative to a 140-g skull fracture threshold. Risk of subdural hematoma was determined by calculating the percentage reduction in angular acceleration relative to the bridging vein failure threshold, computed as a function of impact duration. Ranking the helmets according to their performance under these criteria, the authors determined that the Schutt Vengeance performed the best overall.

CONCLUSIONS
The study findings demonstrated that not all football helmets provide equal or adequate protection against either focal head injuries or traumatic brain injuries. In fact, some of the most popular helmets on the field ranked among the worst. While protection is improving, none of the current or retired varsity football helmets can provide absolute protection against brain injuries, including concussions and subdural hematomas. To maximize protection against head and brain injuries for football players of all ages, the authors propose thresholds for all sports helmets based on a peak linear acceleration no greater than 90 g and a peak angular acceleration not exceeding 1700 rad/sec2.

http://thejns.org/doi/abs/10.3171/2014.11.JNS141742
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In December a movie titled "Concussion", staring Will Smith will be released in theaters, chronicling the discoveries of Dr. Bennett Omalu, who first discovered Chronic Traumatic Encephalopathy (CTE) as the consequence of repeated blows to the brain in football and attempts by the National Football League (NFL) to deny any causal link. 
https://youtu.be/Qk-1TLVUPZk 
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Great for motorsports. But the solution for team sports, such as football, lacrosse etc. as well as individual sports such as skiing and motorcycling is far more complex
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I have developed a sports helmet that reduces forces associated with concussion and brain injuries by up to 50%. This is the result of several years work. It is my hope that this research will dramatically reduce the risk of sports-related traumatic brain injuries.
Hopefully sports helmet manufacturers will step forward with an interest to collaborate with me and perhaps license this patent-pending technology.
http://drbiomechanics.com/sports-helmet-football-helmets/new-helmet-technology/ 
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I have just posted an interesting piece, titled "A Generation of Young Football Players Exposed to Brain Injury", which discusses the failure to implement helmet testing standards to minimize the risk of catastrophic brain injuries, such as subdural hematomas, which have resulted in more than 30 unnecessary deaths among high school and college football players during the past 10 years. 

To read more, go to: http://drbiomechanics.com/football-players-brain-injury/
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