When your core temperature stabilizes, the chills subside. A by-product of your basal metabolic rate is heat production. In order to keep your body from melting down, there must be subsequent heat loss. This heat loss occurs in the following ways. Heat is lost by conduction when we sit on a cold surface.
Heat is radiated away when photons of infrared light are given off by the body.
Via the vascular system, heat is continuously transferred between the two. Reacting to the stimuli of the hypothalamus, constriction or dilation of these vessels adjusts the supply of heated blood from the core to the periphery. This concept of thermal regulation requires the EMT to maintain a position of pro-active thinking. The body will transfer to the periphery a tremendous amount of heat before the core will register a heat loss. Our bodies are amazing in that we are somewhat adaptable to adverse conditions.