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Heart Rate Features
The Forerunner device has a wrist-based heart rate monitor and is also compatible with chest heart rate
monitors. You can view heart rate data on the heart rate widget. If both wrist-based heart rate and chest heart
rate data are available, your device uses the chest heart rate data.
There are several heart rate-related features available in the default widget loop.
Your current heart rate in beats per minute (bpm). The widget also displays a graph of your heart rate for
the last four hours, highlighting your highest and lowest heart rate.
Your current stress level. The device measures your heart rate variability while you are inactive to
estimate your stress level. A lower number indicates a lower stress level.
Your current Body Battery
™
energy level. The device calculates your current energy reserves based on
sleep, stress, and activity data. A higher number indicates a higher energy reserve.
The current saturation of oxygen in your blood. Knowing your oxygen saturation can help you determine
how your body is adapting to exercise and stress.
NOTE: The pulse oximeter sensor is located on the back of the device.
Wrist-based Heart Rate
Wearing the Watch
CAUTION
Some users may experience skin irritation after prolonged use of the watch, especially if the user has sensitive
skin or allergies. If you notice any skin irritation, remove the watch and give your skin time to heal. To help
prevent skin irritation, ensure the watch is clean and dry, and do not overtighten the watch on your wrist. For
more information, go to garmin.com/fitandcare.
• Wear the watch above your wrist bone.
NOTE: The watch should be snug but comfortable. For more accurate heart rate readings, the watch should
not shift while running or exercising. For pulse oximeter readings, you should remain motionless.
NOTE: The optical sensor is located on the back of the watch.
• See Tips for Erratic Heart Rate Data, page 34 for more information about wrist-based heart rate.
• See Tips for Erratic Pulse Oximeter Data, page 54 for more information about the pulse oximeter sensor.
• For more information about accuracy, go to garmin.com/ataccuracy.
• For more information about watch wear and care, go to www.garmin.com/fitandcare.
Heart Rate Features 33
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