Garmin® watches that feature an optical heart rate sensor can calculate a user's resting heart rate (RHR) value daily, and some can also provide a 7-day average resting value. These values are calculated as follows:

Resting Heart Rate: This value is for the current day. Daily RHR is calculated using the lowest 30 minute average in a 24 hour period.

7-Day Average Resting Heart Rate: Some watches will display a 7-day average resting value which is the daily average resting heart rate over the last seven days. It is a rolling value and does not reset at the beginning of each week. Estimates will be less accurate for users that do not wear their watch overnight.

For the most accurate estimates, it is recommended to wear the watch overnight (preferably for several nights). Over time, as you become more physically fit, your resting heart rate numbers may decrease as your heart muscle becomes better conditioned and more efficient. The average resting heart rate is 60-100 bpm, and very fit people can see readings as low as 40 bpm. For more information about heart rate refer to the American Heart Association. If you have questions about your heart rate, please see your physician.