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37C is 98.6F, which is normal body temperature. In order to provide any protection to the brain from a traumatic or ischemic (lack of blood flow) injury, you must get the brain temp down 10-20F, like by packing the head in ice like Purspeed said. Staying at 37C will not provide any possible protection. And if you are lying on the road with a head injury and/or other bodily injury, your temp will most likely go down, not up. The swelling comes from the trauma and bleeding, not from overheating. If this thing really got cold inside, enough to drop brain temperature, it might work like it was advertised.
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