Why does HRM-Dual consistently shows *very* high HR (170+) during first 6-8 min of warmup during runs? Is this a fit issue? Don't feel like I've maxed out my HR; not gasping

All Garmin HRM show elevated Heart rate when beginning a run - Accessories & Sensors - Running/Multisport - Garmin Forums

HRM-PRO intermittent during activity - Accessories & Sensors - Running/Multisport - Garmin Forums

Solved please help me answer the different parts to this one

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HRM PRO abnormally high values during first minutes - Accessories & Sensors - Running/Multisport - Garmin Forums