Polar h10: why is my heart rate flat on the app, but continuous on Garmin watch : r/Polarfitness

Anybody knows what's the reason that apple watch hasn't measured my sleep cycles (REM/Deep). Why the bars are green only? I have autosleep application which shows detailed data. : r/AppleWatch

Continuous heart rate monitoring - Polar H10? : r/Polarfitness

Polar H10 Heart Rate Monitor: Very Long Term In-Depth Review

The what and how of Polar's Continuous Heart Rate

Inaccurate heart rate in app? : r/Polarfitness

Muscle Oxygen Training: Polar H10 ECG tracing - a short how to guide

Polar H10 Heart Rate Monitor: Very Long Term In-Depth Review

Does the passive heart rate monitor just fake it or what : r/AppleWatch

Polar Grit X GPS Watch In-Depth Review

Heart rate not syncing from PW2 to Fitbit app : r/GooglePixel

Polar Verity Sense constant drop of heart rate and Bluetooth connections : r /Polarfitness

Polar OH1+ Review (2019 ANT+ Update)

Polar Verity Sense constant drop of heart rate and Bluetooth connections : r /Polarfitness

Can I swim with an Apple Watch showing my heart rate and number of laps simultaneously and not need the iPhone to be nearby? : r/AppleWatch

Galaxy Watch doesn't detect heart rate while standing or walking : r /GalaxyWatch