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Is it possible for a device to measure how much air we breathe in and out over the entire day and at what rate? I think if we have access to this data we can compare it across people.

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it is certainly possible to make. might be clumsy to wear though. –  user813801 Jul 14 at 20:47

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up vote 3 down vote accepted

What you are looking for is a spirometer. There are different types of spirometers serving different purposes like the Incentive spirometer and the peak flow meter. I would suggest that you go through the wikipedia page on it to get more info.

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thanks, but then the most advanced spirometer seems to measure breathing only temporarily and not on-the-go i.e. complete day analysis when doing routine tasks. so i guess the state-of-the-art has not reached that level. –  user13107 Jul 15 at 5:41
    
@user13107 Might be in development if the need arose but I am unaware of it. –  The Last Word Jul 15 at 5:44

Another possibility is K4 device and K4 device. Beyond spirometry it can measure other variables such as:

  • Pulmonary Gas Exchange (VO2, VCO2)
  • Breath by Breath Technology
  • Telemetry Data Transmission up to 1000m
  • Indirect Calorimetry
  • Integrated GPS System
  • Integrated Oxygen Saturation (SpO2)
  • Integrated 12-lead Stress Testing ECG
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