How can I measure blood pressure with a smartwatch?

A smart watch with a built-in computer. It is gaining popularity due to its compatibility with sports, such as being able to measure the current position and movement speed by the function of GPS and various sensors. If you run the music playback application and connect Bluetooth earphones, it will quickly turn into a digital audio player. You can buy drinks with electronic money compatible products, so you can quench your thirst. Such a smart watch is also active in health management. It is also possible to measure the pulse with the heart rate sensor and use it for advice on exercise pace, and record and share training data in the cloud in cooperation with smartphones. Smart watches equipped with blood pressure measurement functions have also appeared, but this function can be roughly divided into two types. One has an inflatable band (cuff) that compresses blood vessels in the wrist. The other, without a cuff, uses a sensor behind the display to measure blood vessel vibrations and estimate blood pressure.

"Omron HeartGuide" Both can be said to be blood pressure measurement functions, but the more accurate measurement is the former, which is faithful to the oscillometric method proven in blood pressure measuring instruments, and the products sold as of August 2019 are Omron Healthcare 's "HeartGuide" only. It has already been approved by the FDA (U.S. Food and Drug Administration) in the United States, and is scheduled to go on sale in Japan after it is approved as a medical device. The latter sensor-based method is simpler than the cuff-based method. Since it is not approved as a medical device, it is better to understand that the measured blood pressure is only a reference value. However, it is more compact and easier to handle than the cuff method, and there are already multiple products such as the "Galaxy Watch Active" that use it. The exact value will be measured at a later date, so if you just need to know the rough value, it can be said that it is affordable.