The Hunting Reflex
With this recent bout of cold weather, it got me thinking about a phenomenon I learned about in chiropractic school called the hunting reflex. This is a primitive reflex of the body where prolonged exposure to the cold causes our brains to send more blood to the extremities to keep those areas warm. This was particularly useful in early humans when they would spend long hours hunting out in the cold.
This relates to chiropractic in the application of ice packs to reduce swelling.