A body that is unprepared for a workout may experience nausea and light-headedness. Several issues regarding food and liquid intake, extreme fatigue, a medical condition affecting the circulatory system, medications and sickness may lie behind these symptoms affecting a trainer during exercise. In addition, light-headedness may be accompanied by blurred vision or hearing impairment, while nausea may result in vomiting or intestinal distress. Most of the time, nausea and light-headedness experienced during workout sessions are easily preventable, provided certain underlying medical conditions that require a physician's care do not exist.
Dehydration
Weight training and aerobic exercises performed at a sustained steady pace is physically taxing, quickly depleting the body of vital nutrients that will eventually need to be replaced. Water is one of these nutrients utilized by the body during vigorous exercises. If a trainer fails to supply his body with a sufficient amount of water prior to exercising, dehydration may occur, especially if he perspires heavily during the workout. Other symptoms of dehydration, in addition to nausea and dizziness, are headache and blurry vision. Manifestation of these symptoms occurs when about 2 percent of the body's normal water amount is lost. Rehydration with water or Gatorade usually restores the body's liquid level fairly quickly and eliminates symptoms.
Hypoglycemia
Hypoglycemia — low blood sugar — may produce nausea and light-headedness during exercise. This condition occurs when an excess amount of insulin enters the bloodstream, when blood sugar is depleted too rapidly or when glucose is not provided quickly enough to the blood. While diabetics are highly susceptible to hypoglycemia, people who are not diabetic can also suffer from it, especially during a workout. Someone who decides to exercise without eating enough food prior to exercising may experience this condition; for example, an individual exercising before eating breakfast may suffer a hypoglycemic reaction. In addition to nausea and light-headedness, symptoms of hypoglycemia include headache, sweating, heart palpitations and fatigue.
Inner-ear Infection
Frequently occurring without pain or obvious symptoms, an inner-ear infection is inflammation of the inner ear mechanism, mainly the tubes becoming infected with fluid. When someone has an inner-ear infection, she may experience dizziness, nausea, headache or tinnitus — ear ringing or buzzing — without exercising. However, initial symptoms of an inner ear infection may be exacerbated by moving the head in a repetitive up-and-down motion. Suddenly sitting up or rolling over on a mat could disturb fluid blocking inner tubes, causing nausea and vertigo. An inner-ear infection can be viral or bacterial, and should be properly diagnosed by a physician as soon as possible to begin treatment.
Other Reasons
Other reasons for feeling this way during exercise include low blood pressure, blood pooling, anemia or simply engaging in too intense a workout. Blood pooling occurs after performing deadlifts or squats when blood rushes to areas of the body that need immense amounts of energy. Low blood pressure or anemia need to be checked out by a physician, who will recommend methods to correct these conditions. Trainers participating in overly vigorous exercises may need to reduce their amount of exercising or find different types of exercises that do not cause nausea or dizziness.
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