John O'Reilly on Twitter: "Noticed this for first time in Fitbit app (using Charge 3)... Not sure how long it's been available. https://t.co/oCOm0ulaVf" / Twitter
Fitbit Estimated Oxygen Variation graph is now available - XiteTech
Solved: How do I interpret the blood oxygen variation grap... - Fitbit Community
AskPCMag: How Accurate Is the Apple Watch's Heart Rate Monitor?
Fitbit Versa 2 review: The smartwatch that changes your day - Wellbeing Barista
Can Fitbit FINALLY Detect Sleep Apnea? - One Year Later with Charge 3 - YouTube
A very jagged oxygen variation : r/fitbit
How to read Fitbit health and fitness scores & stats - Tech Advisor