3 zones polarized model

[Bernard Rybicki]

Hi,

after a run with 25% Z1 and 75%Z2 HR zones, the conversion in 3 zones polarized model seems to be strange ( 11% in zone II ????)

Bernard.

[Ale Martinez]

El sábado, 31 de enero de 2026 a la(s) 4:01:40 p.m. UTC-3, bernard....@gmail.com escribió:

Hi,

after a run with 25% Z1 and 75%Z2 HR zones, the conversion in 3 zones polarized model seems to be strange ( 11% in zone II ????)

Why?

[Bernard Rybicki]

the border between zone I and zone II in the polarized model (LT1) seems to be at around 75% HRmax 

my HRmax = 171 bpm

So VT1 = 0,75 x 171 = 128 bpm

after analysing the raw data of this run :

number of values above 128 rpm : 334

total number of values : 2943

% of values above VT1 = 334/2943 = 11

in fact, VT1 is below the border of z2-z3

Great, completely understood.

Thanks.

[Ale Martinez]

El domingo, 1 de febrero de 2026 a la(s) 1:00:48 p.m. UTC-3, bernard....@gmail.com escribió:

the border between zone I and zone II in the polarized model (LT1) seems to be at around 75% HRmax 

my HRmax = 171 bpm

So VT1 = 0,75 x 171 = 128 bpm

after analysing the raw data of this run :

number of values above 128 rpm : 334

total number of values : 2943

% of values above VT1 = 334/2943 = 11

in fact, VT1 is below the border of z2-z3

Great, completely understood.

Thanks.

YW,  also beware in GoldenCheetah the boundary between Polarized Zone I / Zone II is configurable in Training Zones, it has defaults for Power/HR/Pace but you can change it if you have a better estimate.