If you are running a version prior to v3.3 your CP value will be used to calculate 'Coggan' and all If you do that, the 'Coggan' metrics will use Values for CP and FTP in the athlete power zones settings. In GC we compute TSS and BikeScore using your 'CP' value, but from v3.3 you can maintain separate Often users will consider the two as the same. But since it is very difficult for an athlete to maintain the desired intensity FTP 'reality' tends to result in a number that is much lower than CP 'theory'. In practice, CP and FTP are usually close to each other. There is no formal model or protocol for establishing it, most people use rules of thumb like FTP is 95% of 20 minute power, or they use the best power from a 40km TT. Functional Threshold Power (FTP) is an estimate of the power an athlete can sustain for about 60 minutes or a 40km TT. It is calculated using a model and time to exhaustion tests between 2-3 and 12-15 minutes. For more info on xPower see Dr Skiba's paper on BikeScore What is the difference between CP and FTP?ĬP represents the power an athlete can sustain for a very long time, without fatigue, in theory. In practice, NP and xPower are largely the same, whilst Daniels EqP place much higherĮmphasis on upper intensity work. The ride and therefore the training stress of the ride. This is so you can quantify the intensity of They all serve the same purpose - to express the variable power you have generated overĪ given period of time as a single value. METRICS What is the difference between xPower, NP and Daniels EqP?
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