The researchers tested the device on 26 men and women who pedaled indoors on stationary bikes or ran outdoors on tracks and trails. Sodium and potassium in sweat could help check for problems such as dehydration and muscle cramps. Glucose could help keep track of blood sugar levels. Lactate levels could indicate blood flow problems, and skin temperature could reveal overheating and other problems.In addition, the skin temperature sensor helps adjust the chemical sensors to make sure they get proper readings, the researchers said. For instance, higher skin temperatures increase the electrical signals from glucose, which can make it look as if people are releasing more glucose in their sweat than they actually are.
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