For ordinary people, it may be impractical and inconvenient to purchase professional medical equipment. Wearable devices for spo2 measurement are a suitable selection. Why do we have to choose smart wearable devices to detect blood oxygen saturation instead of medical devices? Because in our daily life, several scenarios may need a spo2 measurement.
1. When engaged in outdoor sports such as mountain climbing. We know that the higher the altitude, the thinner the air, and the lower the human spo2 level. When we are engaged in outdoor activities in high-altitude areas, blood oxygen saturation monitoring can assess our physical condition in real-time, thereby adjusting the current exercise intensity to cope with the changing environment.
2, drinking. The human body needs three units of oxygen for every unit of alcohol decomposed completely. Therefore, hypoxia is one of the significant manifestations of drunkenness. However, long-term alcoholics have developed a certain tolerance to alcohol and hypoxia, and they cannot detect them when they are slightly drunk. Such people need to pay more attention to monitoring changes in blood oxygen when drinking.
3. High-intensity mental work. The oxygen consumption of the brain accounts for 20% of the body's oxygen uptake. During high-intensity mental work, the oxygen consumption of the brain must increase. The intake of oxygen is limited for the human body. If we consume too much oxygen, we would feel dizziness, fatigue, and unresponsiveness and cause damage to the brain. We have to strengthen the spo2 measurement if we study or work for a long time every day.
With what is said above, we can get that we need to monitor our blood oxygen saturation during specific activities and sports activities more conveniently and flexibly. Although wearable devices such as sports bracelets are slightly inferior to professional medical equipment in terms of data accuracy, they are better at dynamic tracking and real-time feedback, so they are more suitable for sports enthusiasts.
What principle are the wearable devices to detect spo2 levels?
The oxygen needed for our metabolism enters the body through the respiratory system, combines with the hemoglobin in the red blood cells to form oxygenated hemoglobin, and then transports it to the tissue cells of various parts of the body. Therefore, blood hemoglobin is the key to detect blood oxygen saturation. On the other hand, the level of oxygen contained in hemoglobin affects the blood's absorption of red and infrared light. Specifically, hemoglobin saturated with oxygen absorbs more infrared light, and hemoglobin without oxygen absorbs more red light.
Generally, wearable devices such as smart bracelets or watches use photoelectric sensors to perform optical measurements based on the principle that the amount of light absorbed by arterial blood varies with arterial pulsation. Based on these data, using the background algorithm, the sports watch can calculate the estimated value of the user's blood oxygen saturation.
The data calculated is not an accurate record but an estimated value. Will this value lose its guiding significance?
According to the medical definition, the oxygen saturation of human arterial blood is about 95%-100% under normal circumstances, and the oxygen saturation of venous blood is about 75%. Generally, the arterial blood oxygen is less than 94% is insufficient oxygen supply, and less than 90% is hypoxemia.
Because blood oxygen saturation is evaluated based on interval values, the blood oxygen saturation detected by wearable devices such as sports watches can still help people effectively judge their physical conditions. For example, when we are at an altitude of 3000 meters or more, and our heart rate does not exceed 100, spo2 higher than 90% is health. 80%-90% is mild hypoxia, so we should reduce our activities and have proper rest. When the spo2 level is between 70%-80%, it is moderate hypoxia. We have to inhale oxygen appropriately and take anti-hypoxic drugs. The spo2 level of less than 70% is severe hypoxia. We should stop all activities and go to the hospital immediately.
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