Deleting Files; Heart Rate Features; Wrist-Based Heart Rate; Tips For Erratic Heart Rate Data - Garmin FORERUNNER 255 Series Owner's Manual

Deleting Files

If you do not know the purpose of a file, do not delete it. Your device memory contains important system files
that should not be deleted.
1 Open the Garmin drive or volume.
2 If necessary, open a folder or volume.
3 Select a file.
4 Press the Delete key on your keyboard.
NOTE: If you are using an Apple
NOTE: Mac operating systems provide limited support for MTP file transfer mode. You must open the
Garmin drive on a Windows operating system. You should use the Garmin Express
music files from your device.
The watch 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 glance. If both wrist-based heart rate and chest heart rate data are
available, your watch uses the chest heart rate data.
There are several heart rate-related features available in the default glance loop.
Your current heart rate in beats per minute (bpm). There is graph of your heart rate for the last four hours,
highlighting your highest and lowest heart rate.
Your current stress level. The watch 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 watch 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 watch.

Wrist-based Heart Rate

Tips for Erratic Heart Rate Data

If the heart rate data is erratic or does not appear, you can try these tips.
• Clean and dry your arm before putting on the watch.
• Avoid wearing sunscreen, lotion, and insect repellent under the watch.
• Avoid scratching the heart rate sensor on the back of the watch.
• Wear the watch above your wrist bone. The watch should be snug but comfortable.
• Wait until the icon is solid before starting your activity.
• Warm up for 5 to 10 minutes and get a heart rate reading before starting your activity.
NOTE: In cold environments, warm up indoors.
• Rinse the watch with fresh water after each workout.

Heart Rate Features

NOTICE
® computer, you must empty the Trash folder to completely remove the files.
Heart Rate Features
application to remove
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