The watch is equipped with a heart sensor that reads heart rate with the use of photoplethysmography technology. The recorded data is stored in the Health app on iPhone. There could be many miscellaneous reasons why the watch is not able to send the data consistently like skin perfusion, motion and temporary or permanent changes to the skin. #1. Skin Perfusion: It depends on the environment and varies from person to person. #2. Motion: The watch can measure heart rate if your body is in rhythmic motion like running or cycling. #3. Changes to Skin: Any temporary or permanent change to the skin like; scratch or tattoo may prevent the watch from recording the heart rate. According to Apple, even in the ideal situation, the watch can’t send reliable heart rate every time. The Watch measures heart rate regularly at every ten minutes but won’t do so, if you are in motion, or your arm is moving. Apple Watch Not Sending the Consistent Heart Rate Data Here are two tricks that might help the watch send the heart rate data consistently to iPhone. Let’s find out! Wear Your Watch Snug Fit Make sure to wear your watch snug fit. It helps in letting your watch measure the heart rate consistently. Trick Wrist Detection for Better Result Step #1. Turn off Wrist Detection (open Apple Watch app on iPhone → My Watch → General → Wrist Detection.) Step #2. Restart your Apple Watch by pressing and holding on the side button and Digital Crown at once. Step #3. Turn on Wrist Detection. That’s all! Hopefully, your wearable device might do the job as usual.
