I really don’t have much for this quote found in this article;
“I have a theory on concussions,” he said. “I think the reason there’s so much more of them — obviously the impact and the size of the equipment and the size of the player — but there’s another factor: everyone wears helmets, and under your skull when you have a helmet on, there’s a heat issue.
“Everyone sweats a lot more, the brain swells. The brain is closer to the skull. Think about it. Does it make sense? Common sense?” said Carlyle, who said he’d never talked to a doctor about his premise, which he was introduced to by Jim Pappin, the former Leaf who also played his career helmet free.
“I don’t know if it’s true, but that would be my theory. Heat expands and cold contracts. The brain is like a muscle, it’s pumping, it swells, it’s a lot closer to the outside of the skull.”
Stick to coaching hockey, eh!