VO2 max cycling-running.

I guess it is easier to estimate the power while running, than at cycling, since there are additional variables (i.e. the weight of the bike, the terrain. the road surface, the gear, the tires,...)

yes,  but with running you have also much variables that the watch didn't now?

but with running you have also much variables that the watch didn't now?

Yes, but these variables usually have minimal impact on the estimated effort, whereas during cycling power is absolutely crucial. Without it the device has no idea what kind of effort you're making.

Because now when i'm running i getting an VO2max result, and not with cycling, so i think my VO2max isn't correct anymore?

If you run on hard surface AND the wind is not very significant AND you don't carry extra load (like a backpack), then the VO2max estimate for running should be reasonable.

I am still wondering about my vo2 max. Garmin connect says it is bad (32) and I am like a 72 years old while I am 66. I run the 15 min with a little more than 10 km/hr and my heart rate is about 100% max( i use max as 220-age) under about the whole time. Neither me or any other one can see that as a 72 old man but Venu does. Any ideas?

Ok. I change it now to 170 and I will see tomorrow, today is my rest day. I usually run most of the 15 minutes at 154bpm which is 90% of 170. Thank you for your advice. I hope I will be younger tomorrow. Rgrds

Today Garmin app gave me the magic youth water and I am 60 years old instead of 72 for afew days ago. That sound more logical and it did make me happy. Thank you tmk2 which draw my attention to the maxx heart beat which was the default but it was not the right one. Now 87% of my workout is in zone 4.