The bracelet is more accurate in measuring blood oxygen saturation, but it is only for reference.
Handband measurement of blood pressure and blood oxygen is more reliable, the specific measurement results need to be different from person to person. Compared with medical devices, the accuracy can reach more than 90%.
The oxygen sensor chip used in the smart bracelet is reflective, there are two light-emitting diodes in the chip, respectively, the wavelength of 669nm red light and 880nm infrared light to the wrist, the other side of the photodiode is used to receive the reflected light, the difference in light intensity between the emission and reception of the blood can be calculated by the saturation of blood oxygen.
Oxygen saturation is usually above 90%, but if it falls below 90% regularly, you should rest or have it checked.
Blood oxygen saturation can reflect the body's oxygen supply, if the blood oxygen level is low, easy to trigger fatigue easily sleepy, lack of energy, memory loss and other symptoms, long-term insufficient blood oxygen level, but also on the brain, the heart and other organs to cause damage.
Expanded
The feature of measuring oxygen saturation first appeared on Huawei's smartwatch, which partnered with 301 Hospital to **** together on people's heart health and apply medical research to smart wearables.
Especially for snoring people, excessive mental laborers, senior people, and people in high mountain/plateau oxygen-deficient environments should be concerned about this. As for accuracy, the test data provided by the bracelet is for reference only, but it does give a rough indication of the problem.