apple heart rate monitor is extremely erratic on my apple watch ultra
Just got on treadmill and heart rate was shown to be 145 - chest monitor showed 85
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User profile for user:
SnickZ.
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Community Specialist
Hey docmsr,
Thanks for asking about this feature on Apple Watch.
Make sure you're on the latest version of iOS and watchOS supported by your devices.
This article explains how your Apple Watch keeps track of your heart rate: Check your heart rate on Apple Watch - Apple Support. In there you’ll find this information:
"Note: The back of your Apple Watch needs skin contact for features like wrist detection, haptic notifications, blood oxygen level measurements (Apple Watch Series 6, Apple Watch Series 7, and Apple Watch Series 8 only), and the heart rate sensor. Wearing your Apple Watch with the right fit—not too tight, not too loose, and with room for your skin to breathe—keeps you comfortable and lets the sensors do their job. For more information, see the Apple Support articles Wearing your Apple Watch and Monitor your heart rate with Apple Watch."
If you have any other questions, please contact our Health team here.
If you believe that you're experiencing a medical emergency, please contact your local emergency services.
All the best.