When I use the optical heart rate sensor of my FR945 in my morning strength sessions it detects a much higher HR than when I put on the HRM-Tri chest strap. The result greatly affects the amount of Kcal that Garmin estimates I have spent. This is a subject that worries me these days of confinement. How is such a difference possible? I understand that the error is in the optical sensor and not in the chest strap. Attached image of two very similar sessions.

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OHR VS HRM TRI in strength sessions

How is such a difference possible? I understand that the error is in the optical sensor and not in the chest strap.
Attached image of two very similar sessions. OHR VS HRM TRI

0 MarinusvD over 5 years ago

I know that the optical sensor is not secure ! dont use it for sports !

0 KonstantinosTsipotis over 5 years ago

Don't use the OHR in sports/workouts where the arm puts force. Use it in running.