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Vital signs. 1  High temperature, increased heart rate, decreased blood pressure, and faster breathing are signs of potential dehydration and other illnesses. 2  Taking the pulse and blood pressure while the person is lying down and then after standing up for one minute can help determine the degree of dehydration.
If the body sweats a lot, such as during strenuous exercise on a hot day, the body can lose a lot of water and become dehydrated. The body may then have insufficient water to make sweat, so the bodyâs core temperature may continue to rise. This can be very dangerous.ody temperature can increase as a result of being in a warm environment or as a result of exercise. During exercise, respiration [respiration: Chemical change that takes place inside living cells, which uses glucose and oxygen to produce the energy organisms need to live.