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Functional threshold power is defined as the highest power output a cyclist can maintain in a quasi-steady state for approximately 60 min (FTP 60 ). In order to improve practicality for regular evaluations, FTP 60 could theoretically be determined as 95% of the mean power output in a 20-min time trial (FTP 20 ). This study tested this assumption and the validity of FTP 20 and FTP 60 against the individual anaerobic threshold (IAT). Twenty-three trained male cyclists performed an incremental test to exhaustion, 20- and 60-min time trials, and a time to exhaustion at FTP 20 . Power output, heart rate and oxygen uptake representing FTP 20 , FTP 60 and IAT were not different (p&gt;0.05), and large to very large correlations were found (r=0.61 to 0.88). Bland-Altman plots between FTP 20 , FTP 60 and IAT showed small bias (-1 to -5 W), but large limits of agreement ([-40 to 32 W] to [-62 to 60 W]). Time to exhaustion at FTP 20 was 50.9±15.7 min. In conclusion, FTP 20 and FTP 60 should not be used interchangeably on an individual basis and their validity against IAT should be interpreted with caution.

Functional Threshold Power in Cyclists: Validity of the Concept and Physiological Responses