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Heart rate is max (165) at the start of cardio; then reduces to low 100 at the same level of 5.5 miles/hr. I have a refurbished Garmin 245

8510192 over 2 years ago

I've never gone above 155 even at 6 mi/hr. Is it time for a new Garmin?

0 e7andy over 2 years ago

Are you using a HR chest strap? Optical heart rate is easily affected by many different variables.

0 8510192 over 2 years ago in reply to e7andy

No, it's wrist.