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. 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. The ink, pattern, and saturation of some tattoos can block light from the sensor, making it difficult to get reliable readings. Permanent or temporary changes to your skin, such as some tattoos, can also impact heart rate sensor performance. 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. You can make an approximate estimate of your maximum heart rate based on your age: Just subtract your age from 220 to get your maximum age-related heart rate. ![]() This is the target range for moderate-intensity physical activity. Skin perfusion (or how much blood flows through your skin) is one factor. The target heart rate for brisk walking should be between 64 and 76 of your maximum heart rate. Many factors can affect the performance of the Apple Watch heart rate sensor. Learn how to calibrate your Apple Watch What else affects your heart rate reading Calibrating your watch can also help it learn your fitness level and stride. Calibrate your Apple Watch to improve the accuracy of your distance, pace, and calorie measurements.
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