2. The disadvantages of running in the morning. Increase the risk of respiratory diseases: the concentration of carbon dioxide in the air is relatively high in the morning, especially in foggy weather, with poor air quality and high content of harmful substances. If you run too early, you will increase the risk of respiratory diseases. It is easy to cause hypoglycemia: if you run on an empty stomach in the morning, it may cause hypoglycemia, causing dizziness and syncope. Increase the risk of thrombosis: there are more platelets in human blood in the morning, so human blood is sticky. Running in the morning will increase blood viscosity and increase the risk of thrombosis.
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