Mountain Bike Racing
The advent of the SRM Power crank system has allowed coaches and scientists to measure the cyclists actual power output.

Previously the demands of mountain bike (MTB) racing could only be speculated, or roughly estimated from heart rate recordings. The SRM system allows the cyclists actual power output to be record during training and racing, therefore coaches and scientist can now assess the cyclists performance, and provide enhancement strategies based on quantitative data rather than gut-feeling. An example of a cyclists power output, speed and heart rate during a cross-country (XC) race are shown below.

The graph demonstrates how heart rate is not a good indicator of instantaneous effort but rather gives an indication of the cyclists average work-rate over large sections of the race.