From FLIR
Various thermoregulatory mechanisms employed by the body are important for the athlete to avoid heat illness. By employing an infrared camera to focus on the radiation of heat from a venous plexus in the face, we were able to postulate normal and abnormal patterns of thermoregulation in National Football League players. Shunting of blood flow to the pterygoid plexus appears to be a normal compensation for increased body temperature generated by working muscles. Players demonstrated an increase in blood flow by infrared measure while resting on the sidelines. Failure to adequately increase blood flow to the plexus as measured by infrared thermography may represent a player predisposed to heat illness or a player progressing towards heat illness.
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