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2. Visible (mobile app) - Wikipedia

   en.wikipedia.org/wiki/Visible_(mobile_app)

   The app gathers data on exertion levels, symptom severity, and heart-rate variability. HRV is approximated using a smartphone's camera via a technique called photoplethysmography, and according to the app's developers, can indicate how much someone needs rest. [1] [4] [3] The app is currently free, but is expected to be freemium in the

3. Azumio - Wikipedia

   en.wikipedia.org/wiki/Azumio

   Instant Heart Rate, released in October 2010, [11] is a mobile Heart Rate Monitor app. With advancements in mobile phone camera resolution, most smart phones can accurately measure heart rate by analyzing minute color changes of the skin.

4. Samsung Health - Wikipedia

   en.wikipedia.org/wiki/Samsung_Health

   The availability of the heart rate measurement function coincides with the release of the Samsung Galaxy S5 which has a built-in sensor. This function is limited to take the measurement punctually and at rest. The same sensor is made to also measure Pulse oximetry and stress levels. The app also collects and displays values from Samsung Galaxy ...

5. Fitness tracker - Wikipedia

   en.wikipedia.org/wiki/Fitness_tracker

   Wearable heart rate monitors for athletes were available in 1981. [4] Improvements in technology in the late 20th and early 21st century made it possible to automate the recording of fitness activities, as well as to integrate monitors into more easily worn equipment. The RS-Computer shoe was released in 1986.

6. Heart rate monitor - Wikipedia

   en.wikipedia.org/wiki/Heart_rate_monitor

   A heart rate monitor (HRM) is a personal monitoring device that allows one to measure/display heart rate in real time or record the heart rate for later study. It is largely used to gather heart rate data while performing various types of physical exercise. Measuring electrical heart information is referred to as electrocardiography (ECG or EKG).

7. The 7 Best Sleep Trackers To Help Maximize Your Eight Hours - AOL

   www.aol.com/lifestyle/7-best-sleep-trackers-help...

   Tomorrow's under-mattress sleep tracker comes in two options—for a single person or for couples—and gives you all the basic feedback you need through its intuitive app: heart rate and ...