According to FirstBeat's whitepaper (the algorithm provider behind Garmin's fitness/recovery tools), the error is +/- 4.3% when true HR max is entered.
https://www.firstbeat.com/...2max_11-11-20142.pdf
Importantly, it looks as though the algorithm accounts for general pace variability but not grade in its calculations.
Alan Couzens, M.Sc. (Sports Science)
Exercise Physiologist/Coach
Twitter: https://twitter.com/Alan_Couzens
Web: https://alancouzens.com
https://www.firstbeat.com/...2max_11-11-20142.pdf
Importantly, it looks as though the algorithm accounts for general pace variability but not grade in its calculations.
Alan Couzens, M.Sc. (Sports Science)
Exercise Physiologist/Coach
Twitter: https://twitter.com/Alan_Couzens
Web: https://alancouzens.com
Last edited by:
Alan Couzens: Apr 16, 18 12:34