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FTP estimation with FR945 without power meter?

Hi! I have read everywhere that the forerunner 945 needs a power meter in order to estimate the FTP (Functional Threshold Power). However, my watch gave me an estimation after biking without such sensor (I only have a chest heart rate monitor HRM-Run). Could someone please explain me how it is possible and how it really works?

Also, even though I had the FTP estimate, my cycling VO2max is empty (I have had the watch for a few days). Did the watch take my running VO2max to calculate the FTP?

Thanks!

0 f|33tStA over 4 years ago

thats impossible without powermeter, think, you played arround with FTP settings on Garmin Connect!

0 xuxumatu over 4 years ago

https://apps.garmin.com/en-US/developer/f8488290-45d3-4448-a331-62c0f860746f/apps

yes i´ts possible check my apps

0 f|33tStA over 4 years ago in reply to xuxumatu

but update your Apps the vo2max of Garmin Training Load then?

0 xuxumatu over 4 years ago in reply to f|33tStA

VO2Max = [(10.8 x FTP)/WEIGHT] + 7 (kg x min)

if you got FTP you can calculate VO2Max

0 f|33tStA over 4 years ago in reply to xuxumatu

you can maximal calculate it for the activity, but not for the historical data in the Garmin Ecosystem and the user asked more or less for this option, anyway your formular tells me my vo2max ist arround 10 points lower as the one i get from Garmin