Why is there a discrepancy in the evaluation in between heart rate and power defined training zones?
There are several reasons for this: 1. The correlation of heart rate and power is not always stable, since the heart rate depends on many other factors beside power. 2.With improved fitness your power output increases relative to the heart rate. 3.Short term peak loads especially if extreme, are not reflected in the pulse, since the heart rate lags behind the effort . Heres a short overview of the 3 power measurement systems supported by 2PEAK : SRM was the first and amongst pros still the most popular system : The power meter from the German manufacturer SRM consists of a modified crank that is compatible with Campagnolo and Shimano bottom brackets and measures the applied pedal force using strain gauges. These are electrical resistors that change their conductivity proportionally if mechanical force is applied. The extracted data is then saved in a small computer on the handlebar. This device is popular with pros because of its precision and reliability. PowerTap, like SRM, uses stra
