![]() In running for instance, the pace or velocity stream is often available but it is not used directly for the calculation of NP as the power that you had to develop to go at this pace is largely dependent on conditions (especially on slope but also on acceleration or deceleration). This stream can be directly available and used in case you have a power meter but can also be estimated otherwise from speed and slope (see power estimation). ![]() Normalized Power (NP) is calculated starting from a power stream as a function of time. Then, from it and your FTP, it can deduce a relative intensity or intensity factor which combined to the duration yields the training load, also called training stress score. It will first calculate a normalized pace or power for your activity. Refer to for more details.įrom this FTP and your actual output level during the activity, 3record can calculate the metrics below introduced by Coggan in. In order to know your FTP, you have to know the constant level you can maintain for 1 hour (which is your FTP by definition) or you can test it on 20 minutes and correct the value obtained by dividing it by 1.05 (as the duration is shorter, your output is about 5% higher). This should in theory match more or less the activity intensity at which you are at your lactate threshold (LT). FTP is defined as the pace (for swim and run) or the power (bike or other) you can keep constant on an effort of about an hour. To normalize the difficulty of any activity against your abilities, 3record uses the functional threshold pace or power (FTP). 3record definitions are conceptually equivalent but may slightly differ in implementation details NP also sometimes refer to Normalized Pace (called Normalized Graded Pace in TrainingPeaks or Grade Adjusted Pace in Strava). Note: NP / Normalized Power, IF / Intensity Factor, TSS / Training Stress Score are claimed trademarks by Peaksware LLC and were first used commercially in their WKO+ software, even though their definitions where discussed by Allen and other on the Wattage group ( ) before the creation of this software. Training zones are defined as follow as a function of the Lactate Threshold Heart Rate (LTHR) in bpm, or of the FTP (see the corresponding paragraph) in respectively s/100m for swimming, s/km for running, and watts for biking or other activities.
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