Posts tagged: Recovery Score

Your Smart Ring Lies to You at 35,000 Feet: How Cabin Pressure Breaks SpO2, HRV, and Your Recovery Score

Your smart ring was validated at sea level on healthy volunteers. At 35,000 feet in a pressurized cabin, the SpO2 calibration curve is wrong, your HRV is falsely depressed, and your recovery score takes a hit that has nothing to do with how recovered you actually are. Here is the physiology of flying and why your ring does not understand it.