How to measure your SpO2 on your smartwatch
for many people with COVID-19. This led to pulse oximeters becoming a must-have item.
SpO2 sensors in smartwatches work similarly to the photoplethysmography sensors used to measure heart rate. PPG — or optical heart rate — sensors work by shining a green light into your skin to determine your heart rate based on the light that’s reflected back. The difference is that, instead of green light, smartwatch SpO2 sensors shine red and infrared light into your skin. Then, based on the way light reflects back, the devices use an algorithm to estimate your blood oxygen levels.
A “good” score is generally defined as anything above 95 percent, but results above 90 percent are also considered normal. Also, each wearable maker defines what a “good” or “normal” measurement is, so be sure to thoroughly read any included explainers.Vjeran Pavic / The VergeThere are lots of reasons why wearable makers have begun adding these sensors to their devices. Most have added it as a factor in determining your sleep quality.
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