Posted on May 25, 2018 by JohnCan a 20 minute Test Predict Threshold? There is always a debate over if a 20m test can be used to determine a cyclist’s threshold. Here is an interesting finding on the subject. I do all the research so you don’t have to. Is the Functional Threshold Power (FTP) a Valid Surrogate of the Lactate Threshold? | International Journal of Sports Physiology and Performance journals.humankinetics.com