4 ms·

I have a tendency to hold my breath when I'm focused. My watch noticed that.

• nitrogen 5y ago
  Is it looking at oxygenation or dissolved CO2 levels?
  • MengerSponge 5y ago
    More likely a shift in your heart rate, although the latest model can measure O2 saturation
    • wrycoder 5y ago
      It is the latest model. I turned off the periodic notifications in the Breathe app - let's see if it continues to ping me.