When you stop sweating, the body temperature rises too quickly. This is because sweat contains water and salt, so when it evaporates from your skin, a part of this water and salt is lost with every breath taken by your perspiring body. As a result, blood moves away from the surface of the skin to stay closer to your internal organs – which cools them down more rapidly than before. In overheating conditions such as heat stroke this rapid cooling process can be fatal unless you are promptly treated by an ambulance or air-conditioned hospital room where there will be at least one nurse on stand-by 24 hours a day if necessary.
Why does my heart rate rise?
Your heart beats faster in extreme heat because it has to pump harder against the greater pressure caused by rising temperatures within your body tissues (your hands feel hot during exercise). The higher levels of oxygen demand required for strenuous exertion also increase breathing rates and make thirst even more important as you lose fluids through sweating. To cope with all these changes in activity level some people develop ‘heat cramps’, which cause pain around their stomach area as well as trembling muscles that may leave them unable to walk quickly enough after they have been exercising hard – especially over uneven ground like pavements or open fields!