|Don's Home Health Fittness or Activity Trackers
The bioimpedance sensor in UP3 can look deeper inside the body, and is tuned to look for signals at specific depths. The sensor measures very tiny impedance changes within your body. For heart rate, we are measuring the impedance changes created by the volume of blood that is flowing in the Ulnar and Radial arteries. Because we are able to see the arterial flow, we believe it can maintain a more accurate tracking of your heart rate at your wrist than traditional sensing systems.
Further, because we can control how deep the sensors penetrate we can extract many other signals beyond heart rate. We will be able to see respiration (largely due to changes in oxygen in blood and surrounding cells) and hydration.
Problem with light sensor for heart rate:
At "Personal Sleep Monitors: Do They Work? | Huffington Post",
"To put these devices to the test, I needed a gold-standard evaluation of my sleep quality. To achieve that, I underwent a true sleep study. This combination of brain wave tracings, muscle-tone evaluation and eye-movement analysis, along with a live audio/video of my sleep allowed me to see exactly what was happening during my slumber."
Dr. Winter translated the output of all of the devices into a common visual reference to allow for easier comparison.
The sleep page here
"Personal Sleep Monitors: Do They Work? | Huffington Post"
Your Jawbone UP band uses cutting-edge MotionX technology to track activity, giving it superior accuracy. While variations in user, terrain, and activity conditions can influence specific calculations, testing has shown UP to provide industry-leading accuracy in tracking activity and sleep. You can also use the built-in calibration feature to make UP even more accurate for you.
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