Dizziness caused by heavy exercise is mainly related to ischemia, hypoxia and impaired energy supply to the brain after excessive exercise. A large amount of exercise will have violent muscle contraction, blood will be redistributed to supply the muscle movement as a priority, which leads to a reduction in the total blood flow to the brain. At the same time, muscle contraction exercise consumes a large amount of energy and oxygen, most notably glucose, and patients often experience post-exercise hypoglycemia. Although the blood glucose level can be quickly raised and returned to normal through the regulatory mechanism of the pancreas, the brain, which is purely dependent on the energy supply of blood glucose, is very sensitive to hypoglycemia, and with the occurrence of ischemia and hypoxia, dizziness is prone to occur. Patients need to maintain air circulation, increase oxygen supply, and at the same time take glucose water appropriately to improve the energy supply, dizziness can all be quickly improved in a short period of time.