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OHR VS HRM TRI in strength sessions

AOM
over 5 years ago
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.OHR VS HRM TRI