First, the reason

1. Cerebral hypoperfusion: Due to the redistribution of blood during exercise, more blood will enter bones and muscles to ensure the kinetic energy of human movement. At this time, the blood in the brain will decrease accordingly, leading to insufficient brain perfusion and fainting.

2, postural hypotension: more common in track and field sports, the capillaries of lower limb muscles expand a lot. If you stop exercising immediately after running, a lot of blood will accumulate in the blood vessels of the lower limbs, the cardiac output will drop sharply, and the blood pressure will drop, resulting in insufficient blood supply to the brain and syncope.

3. Sugar supplement is not timely: human exercise mainly consumes glycogen conversion energy in the body. After a long period of strenuous exercise, glycogen is exhausted and blood sugar drops. If sugar is not supplemented in time, it will affect the energy supply of brain tissue, cause serious dysfunction of brain function, and lead to syncope and even coma.

Second, the clinical manifestations

1, which can be manifested as sudden and transient loss of consciousness, disappearance of muscle tension and falling, and most patients can regain consciousness after a few minutes.

2. When blood sugar drops, the precursor symptoms are hunger, weakness, sweating, dizziness, tachycardia, delirium, etc. After glucose supplementation, you can quickly regain consciousness.

3. The precursor symptoms of postural hypotensive syncope caused by standing still immediately after exercise are dizziness, fatigue, nausea, pale face, chills in limbs, and severe cases can be syncope.

Third, the treatment method

Patients with syncope should be actively treated according to different causes.

1. Once you have early symptoms of syncope during exercise, you should jog or walk slowly for a while with the help of others, and then lie flat for a while until your body gradually recovers.

2. For patients with hypoglycemia syncope, sugar and salt should be supplemented in time, and 60ml of 50% glucose should be injected intravenously.

3, syncope patients take supine position, lower limbs raised to increase cerebral blood flow, at the same time loosen the collar and belt, turn your head to one side, keep the respiratory tract unobstructed. Give oxygen if necessary. If cardiac arrest is caused, cardiopulmonary resuscitation should be performed immediately.

Fourth, prevention methods.

1, form the habit of scientific physical exercise, choose the exercise mode and intensity suitable for you, and avoid excessive exercise and overwork.

2. Adequate preparation activities should be carried out before and after exercise to ensure good blood oxygen supply and sufficient blood flow for cardiovascular and cerebrovascular diseases, and avoid the phenomenon of insufficient perfusion. For example, after strenuous exercise, you can walk slowly and slowly adjust from the exercise state to the rest state.

3. Add sugar and water in time before and during exercise, just a few times, and pay attention to rest.

4. Those who have been engaged in strenuous exercise for a long time must be athletes who have been trained in sports.

People who are old, weak and hungry should avoid strenuous exercise.

6. Avoid long-term training and competition under the conditions of high temperature, high humidity or no wind in summer.

7. Do a good job in medical security during sports. Besides team doctors, athletes and coaches should have the ability to prevent and simply handle syncope during sports.

Extended data:

Management of exercise-induced hypoglycemia

If hypoglycemia occurs after exercise, you need to supplement glucose above 15g immediately. If you don't have glucose around, you can take any sugary drink or sugary food, and try to ensure that the sugar content is above 15g.

Hypoglycemia is very harmful to human body, which can lead to acute myocardial infarction and sudden death in severe cases, and must not be ignored. After correcting hypoglycemia, we should pay attention to why hypoglycemia occurs. If hypoglycemia is caused by excessive exercise, strenuous exercise is not recommended.

So no matter what causes hypoglycemia, it must be rescued at that time. Then, according to the causes of hypoglycemia, the overall lifestyle adjustment and medication adjustment were carried out.

Baidu encyclopedia-sports syncope