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FTP calculation

Hello,

Does anyone have any insight into the formula used in the FTP autocalculation. I know that it's NOT 20 minute power x 0.95 as my FTP increased yesterday in a workout, and at no point did I do a 20 minute sustained level. I also checked my max average power in Garmin Connect after the ride, and my 20 minute max average was lower than the new FTP set.

I know that there are other, possibly more modern ways to estimate FTP, XERT use a different measure and I think that sufferfest do too, but the Garmin User Manual seems to be behind the reality of the device in this regard.

Anyone clever out there that knows more?

Thanks

Top Replies

Wongataa over 4 years ago +1 verified

It is a Firstbeat algorithm. https://www.firstbeatanalytics.com/en/features/functional-threshold-power-ftp/

They won't tell you the details as it will be a trade secret.

All Replies

+1 Wongataa over 4 years ago

It is a Firstbeat algorithm. https://www.firstbeatanalytics.com/en/features/functional-threshold-power-ftp/

They won't tell you the details as it will be a trade secret.

0 muppetkeeper over 4 years ago in reply to Wongataa

Thank you very much, I should have known it was a Firstbeat algorithm, it's obvious now that you say :-)