- Fasttasks 2 46 – The Troubleshooting Apple Watch Band
- Fasttasks 2 46 – The Troubleshooting Apple Watch Band
- Fasttasks 2 46 – The Troubleshooting Apple Watch 3
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Hi
Apple Watch should not be force restarted (referred to by some as a 'hard reset' unless it is unresponsive and cannot be restarted normally. If that is the case, then follow the instruction here to do so:
You indicate that 'It's wasn't my watch first', which suggests that you may instead be referring to a passcode lock and/or to Activation Lock.
Before selling or giving away the Apple Watch, the previous owner should have unpaired it via the Watch app by following the instructions below. If they have not yet done so, then, if possible, arrange for them to do so:
Otherwise, if the Apple Watch is locked by a passcode and you cannot unlock it via the normal procedure, then follow these steps to erase it (but note that Activation Lock may also be enabled, in which case see below):
- Connect the Apple Watch to its charging cable, connected to power.
- Whilst keeping the Apple Watch on the charger:
- Press and hold the side button until you see the Power Off slider.
- Press firmly on Power Off (do not try to slide it - just press down more firmly than a normal tap), release your finger and then tap on Erase all content and settings.
- Pair the watch using the Watch app on your iPhone.
- More information:
If Activation Lock is enabled, which prevents unauthorised use of Apple Watch if it is lost or stolen, then:
If the Apple Watch is locked to your own account (having previously been paired to your own iPhone):
If you are having issues with your credentials, then it may help to follow the instructions here:
- US: Apple Watch Service Answer Center - Apple Support
- Elsewhere: Select your country for Apple Watch service and repair information
If the Apple Watch is instead pre-owned and locked to the previous owner's account:
More information:
Jan 14, 2018 2:51 AM
How to check your heart rate
Fasttasks 2 46 – The Troubleshooting Apple Watch Band
You can check your heart rate any time using the Heart Rate app. Open the app, then wait for Apple Watch to measure your heart rate. You can also view your resting, walking, breathe, workout, and recovery rates throughout the day. To easily open the app, add the Heart Rate complication to your watch face or add the Heart Rate app to the Dock.
You can also turn on heart rate notifications, so you know if your heart rate remains above or below a chosen beats per minute (BPM), or to occasionally check for an irregular heart rhythm.
Irregular rhythm notifications are available only with watchOS 5.1.2 or later. To enable irregular rhythm notifications, the notifications must be available in your country or region and you must be in the country or region where you purchased your device. Learn where irregular rhythm notifications are available.
Fasttasks 2 46 – The Troubleshooting Apple Watch Band
When Apple Watch measures your heart rate
When you use the Workout app, Apple Watch measures your heart rate continuously during the workout and for 3 minutes after the workout ends to determine a workout recovery rate. If you don't see your heart rate, check your settings.
This information, as well as other data it collects, helps Apple Watch estimate how many calories you've burned. In addition, Apple Watch measures your heart rate throughout the day when you're still, and periodically when you're walking (Apple Watch Series 1 or later). Since Apple Watch takes these background readings based on your activity, the time between these measurements will vary. Apple Watch also calculates a daily resting rate and walking average by correlating background heart rate readings with accelerometer data when sufficient background readings are available. You can control which third-party apps have access to your health data from the Health app in Sources.
Some anomalies may appear in the displayed data, resulting in occasional heart rate measurements that are abnormally high or low.
How Apple Watch measures your heart rate
Fasttasks 2 46 – The Troubleshooting Apple Watch 3
The optical heart sensor in Apple Watch uses what is known as photoplethysmography. This technology, while difficult to pronounce, is based on a very simple fact: Blood is red because it reflects red light and absorbs green light. Apple Watch uses green LED lights paired with light‑sensitive photodiodes to detect the amount of blood flowing through your wrist at any given moment. When your heart beats, the blood flow in your wrist — and the green light absorption — is greater. Between beats, it's less. By flashing its LED lights hundreds of times per second, Apple Watch can calculate the number of times the heart beats each minute — your heart rate. The optical heart sensor supports a range of 30–210 beats per minute. In addition, the optical heart sensor is designed to compensate for low signal levels by increasing both LED brightness and sampling rate.
The optical heart sensor can also use infrared light. This mode is what Apple Watch uses when it measures your heart rate in the background, and for heart rate notifications. Apple Watch uses green LED lights to measure your heart rate during workouts and Breathe sessions, and to calculate walking average and Heart Rate Variability (HRV).
Apple Watch Series 4, Series 5, Series 6, or Series 7* also have built-in electrodes in the Digital Crown and the back of Apple Watch, which can measure the electrical signals across your heart when used with the Heart Rate app or the ECG app. When you place your finger on the Digital Crown, it creates a closed circuit between your heart and both arms, capturing the electrical impulses across your chest.
To use the electrical heart sensor to measure your heart rate, open the Heart Rate app and place your finger on the Digital Crown. You will get a faster reading with higher fidelity — getting a measurement every second instead of every 5 seconds. You'll see 'ECG' in Heart Rate Context when looking at recorded data for Heart Rate in the Health app. You can also use the electrical heart sensor to take an ECG with the ECG app.
*ECG isn't supported on Apple Watch SE. The ECG app is currently available only in certain countries and regions. Learn where the ECG app is available.
For best results
Start with a good fit. Even under ideal conditions, Apple Watch may not be able to get a reliable heart rate reading every time for everybody. And for a small percentage of users, various factors may make it impossible to get any heart rate reading at all. But there are things you can do to help Apple Watch get the most consistent and best heart rate readings possible. Learn what else affects your reading.
