-The optical heart rate monitor and PulseOx stays on while doing a tracked activity if you are using an external sensor for heart rate measurements. You should wear the heart rate monitor directly on your skin, just below your sternum. 4.6 out of 5 stars 827. And … The device automatically uses the wrist-based heart rate monitor unless you pair an
The device measures your heart rate variability while you are inactive to estimate your stress level. If it’s the first time, choose Add new sensor > External Heart Rate Monitor. Garmin Forerunner 945, Premium GPS Running/Triathlon Smartwatch with Music, Black Bundle with Garmin HRM-Tri Heart Rate Monitor 5.0 out of 5 stars 1. The device calculates your current energy reserves based on sleep, stress, and activity data. NOTE: Disabling the wrist-based heart rate monitor also Wear the heart rate monitor with the Garmin logo facing right- side up. NOTE: Stay 10 m (33 ft.) away from other wireless sensors while pairing.