bikescore explanation - PhysFarm Training Systems

Power (watts)
700
600
500
400
300
200
100
0
Power Output, 30s MA, and 25s EWMA for Power Output
10 12 14 16 18 20 22 24
Time (Minutes)
Figure 1: Instantaneous power output (yellow), 25s exponentially weighted moving average for
power output (red), and 30s moving average for power output (blue) for a 20k TT. There is little
apparent difference between smoothing methods.
When applied to a portion of an interval workout, similar results are observed. (Figure 2,
AP=184W, xPower=200W, and NP=204). However, it is easier to observe the differences
between smoothing methods. In this case, it would seem that while the 30s MA more
closely tracks the stress (e.g. the raw power output), the 25s EWMA might be more
representative of the physiologic response or strain imposed by the athlete’s effort.