For anyone looking for a more scientific description of MPA

Here is a new article released today from Dr. Stephen Cheung at Pez Cycling: http://www.pezcyclingnews.com/toolbox/toolbox-xert-maximal-power-available-modelling/#.WOzLPFPyui5

I would also add this other one from the same author: http://www.pezcyclingnews.com/toolbox/toolbox-xert-and-real-time-fatigue-monitoring/#.WPS1c_nyiHs
It’s about “Real Time Fatigue Monitoring”