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Heart rate zone changes after upgrading from 245 to 955

Hi, after I upgraded from Garmin Forerunner 245 to 955, I also realised the heart rate zones changes drastically despite no change in profile, same max heart rate and same setting to use Heart Rate Reserve (HRR). See the two heart rate zones below, the lower ranges for 245 (top pic), the higher ones for 955 (bottom pic). I'm usually keep within lower zones and wonder which watch is more accurate?

heart rate zones for 245 heart rate zones for 955

Top Replies

marketuncle over 2 years ago +1

Thanks for pointing out, the calculated ones show that 245 was indeed more accurate... so much for the upgrade :(
parentoft over 2 years ago in reply to marketuncle +1

Yeah, it's quite annoying that this never got fixed.
marketuncle over 2 years ago in reply to parentoft +1

Thanks for pointing out, found another thread that resolve that too.. using sport heart zone:

forums.garmin.com/.../1623217

All Replies

0 parentoft over 2 years ago

The min/max pulse that are used in Zone 1 (Lowest) and Zone 5 (highest) are calculated - so you have to change them manually in order to match it to your FR 245.

This is a known issue.

0 marketuncle over 2 years ago

Thanks for pointing out, the calculated ones show that 245 was indeed more accurate... so much for the upgrade :(

0 parentoft over 2 years ago in reply to marketuncle

Yeah, it's quite annoying that this never got fixed.

0 marketuncle over 2 years ago in reply to parentoft

Thanks for pointing out, found another thread that resolve that too.. using sport heart zone:

forums.garmin.com/.../1623217

0 global_local over 2 years ago in reply to marketuncle

Ahm... All the formulas are +- 10 beats precise. I would say -

do a LTHR Test (*** strap needed),

Set the running zones per LTHR %. And allow automatic detect MHR and LTHR.