tools_and_techniques [Breathing Data]

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SENSOR RECHNOLOGY & BREATHING TECHNIQUES

For the study, I use the combination of two different __sensor technologies__:
  * smart ring
  * chest belt

**Smart Ring**
Final decision for [[https://ouraring.com/|OURA]]

 [[https://foundation.mozilla.org/en/privacynotincluded/oura-ring/|Review of OURA privacy policy by Mozilla Foundation]].

Applied sensor technology:

  * infrared photoplethysmography (PPG) = Optical method that uses infrared light to measure changes in blood volume 
  * red and infrared LEDs measure blood oxygen levels while sleep.
  * green and infrared LEDs alternate to measure heart rate 24/7 and heart rate variability and respiration rate during sleep.
  * digital sensor measures body temperature variations
  * 3D accelerometer (acceleration) tracks movement and activity 24/7.
  * gyroscope (rotation)

**Chest belt**

[[https://www.polar.com/de/sensors/h10-heart-rate-sensor|Polar H10]] is a chest strap heart rate monitor.

When the heart beats, the electrical signals are transmitted through the body fluids to the skin. Electrodes can be attached there to measure the changes. The best place for such measurements is the chest, as it is closest to the heart. 

The combination of ring and belt allows both short-term changes and long-term developments to be observed. As the devices use different sensor technologies, they complement each other.