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Hi.
I have Apple Watch Series 3. Some days my heart rate on watch is fine sits at 60-80 then exercise to 140 and randomly then get spikes of 210 or down to 39…. How accurate are these as I didn’t even realise the 210 happened until I looked back!!
Apple Watch Series 3, watchOS 8
See the 'For best results' section (and others) in:
Monitor your heart rate with Apple Watch - Apple Support
and the 'What else affects your heart rate reading' section in:
Get the most accurate measurements using your Apple Watch - Apple Support
See the 'For best results' section (and others) in:
Monitor your heart rate with Apple Watch - Apple Support
and the 'What else affects your heart rate reading' section in:
Get the most accurate measurements using your Apple Watch - Apple Support
Apple Watch heart rate
