If you feel dizzy and nauseous after practicing legs usually because of the following factors: 1, the most common factor is hypoglycemic reaction, because when practicing legs the human body is required to consume huge glycogen, which will release a large amount of ATP, heat production and energy production, which belongs to the decomposition consumption state, which will consume a large amount of glucose in the body, leading to the reaction of transient hypoglycemia. At this time should quickly replenish glucose, can drink drinks with high sugar content, sports functional drinks or drinking fruits, sugar, etc. can solve dizziness, nausea. 2, dizziness, nausea when practicing legs, usually because of excessive sweating and resulting in dehydration in the body, can quickly supplement warm water to relieve symptoms. 3, excessive sweating caused by hypokalemia when you can supplement, if the taste of potassium, supplement Daxiu and other drugs, both 4, the history of hypoxemia caused by excessive exercise, should try to breathe fresh air or perform oxygen therapy treatment can relieve the symptoms of dizziness and nausea.