![]() Learn more about how your Apple Watch uses GPS and the heart rate sensor when you use the Workout app. For example, when you’re running indoors, it also uses the accelerometer. A quick look at the best fitness trackers Best overall: Apple Watch Series 7 Best budget: Amazfit Band 5 Best for running: Garmin Forerunner 245 Best for cycling: Polar Vantage M Best for. ![]() Depending on your workout, it selects the most appropriate inputs for that activity. Heart rate is one of many factors that Apple Watch uses to measure your activity and exercise. If you’re not able to get a consistent reading because of any of these factors, you can connect your Apple Watch wirelessly to external heart rate monitors such as Bluetooth chest straps. Rhythmic movements, such as running or cycling, give better results compared to irregular movements, like tennis or boxing. ![]() Motion is another factor that can affect the heart rate sensor. or calories burned, was not: The most accurate device was off by 27 percent, and the least accurate was. The ink, pattern, and saturation of some tattoos can block light from the sensor, making it difficult to get reliable readings. But can your Polar watch track calories burned. Download Calorie Tracker now and start improving your lifestyle.' more. With a simple and accurate interface, you can monitor your calories and progress towards your goals efficiently. Permanent or temporary changes to your skin, such as some tattoos, can also impact heart rate sensor performance. The most accurate tracker turned out to be the Apple Watch, which matched the machines readings with 90 accuracy. Download it now.' 'Calorie Tracker is the perfect tool for those looking to improve their health and control their daily food intake. A quick look at the best fitness trackers Best overall: Apple Watch Series 7 Best budget: Amazfit Band 5 Best for running: Garmin Forerunner 245 Best for cycling: Polar Vantage M. If you’re exercising in the cold, for example, the skin perfusion in your wrist might be too low for the heart rate sensor to get a reading. Skin perfusion varies significantly from person to person and can also be impacted by the environment. Skin perfusion (or how much blood flows through your skin) is one factor. Many factors can affect the performance of the Apple Watch heart rate sensor.
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