Hypothermia: Level 2

Hypothermia describes a core body temperature below 35C^1,2. This occurs when heat lost to the environment exceeds the heat generated by the body. Hypothermia is more likely in cold, wet or windy conditions but can also occur at relatively ambient temperatures³.

During exercise heat is generated through muscle contractions; therefore, you can usually maintain a stable core body temperature even during a cold and wet race. Problems may occur if you are forced to slow down unexpectedly, such as by injury or exhaustion⁴. This slowing not only exposes you to the cold and rain for longer, but also means less heat is generated by the muscles. Inadequate clothing can further increase the risk of hypothermia³. You should check the weather ahead of a long run or race and make sure you have appropriate layers, and waterproofs if required.

After a long run or race, wet clothing should be removed immediately and you should find a warm environment to gradually warm up. Blankets and warm drinks are helpful⁵. If you are feeling cold and have additional symptoms, such as confusion or sleepiness, then you should seek medical attention⁵.