customed calculates 2 basic parameters during a stress test: MET and PWC.
Below you will find an explanation on how we do it.
...
http://books.google.de/books?id=1b0iwv8-jGcC&printsec=frontcover&hl=de#v=onepage&q&f=false
2002_AHA-Guideline for exercise testing.pdf
AHA, page 18.
The translation of exercise duration or workload into METs (oxygen uptake expressed in multiples of basal oxygen uptake, 3.5 O2 mL/kg per minute) has the advantage of providing a common measure of performance regardless of the type of exercise test or protocol used. Although such translations are based on
...