Maximum Power Available, also referred to as MPA™, is a measure of the most power an athlete can generate at a given moment during exercise. By definition, the highest value for your MPA is equal to your Peak Power. Conversely, the lowest value for MPA is equal to your Threshold.
When riding hard (above your Threshold Power), your MPA decreases, indicating muscle fatigue. The higher about your Threshold Power (TP) you ride, the faster MPA declines. On the other hand, riding below TP allows MPA to increase/recover. The further below TP you recover, the faster MPA recovers.
The point where your power is equal to your MPA is defined as a point-of-failure or maximal effort. Maximal efforts are calculated by using power data together with an athlete’s Fitness Signature to calculate the athlete’s ability to generate power at any given point in time. These are visualized below where the MPA line (purple) dips down and touches your power data:
