The effect of exercise on oxygen saturation is related to the degree of exercise. Oxygen saturation is the concentration of oxygen in the blood, usually around 98%. Temporary exercise and intense exercise have different effects on oxygen saturation. 1. Temporary exercise: the oxygen content of the blood is lowered, but it is also in the normal range, i.e. greater than 90%. Because exercise promotes the body to consume oxygen, long-term aerobic exercise, can improve the heart muscle and so on. 2. Vigorous exercise: affects blood circulation, which will make blood oxygen drop. Affect the elimination rate of fatigue. For example, wrestling, playing ball, etc. If the exercise is too intense, blood oxygen saturation <90% may occur. It can lead to symptoms such as lack of concentration, dizziness and anxiety. It is recommended to consult with a clinician and professional fitness instructor to choose an exercise routine that is appropriate for you. If a decrease in blood oxygen saturation occurs after exercise, medical attention is needed as soon as possible to avoid delay.