Assigns a percentual value to a time you ran on a certain distance. Data via Alan Jones. This percent enables you to compare yourself to someone of a different age or gender. In essence this value is the ratio of your time to the world record (or expected world record) for someone in your category.
This does not mean that a value of 70% indicates you are in the top 30% of the world. The value is only there to compare with the values of other people.
h m s
This predicts your time in one race based on your time in a previous one. Formula devised by Pete Riegel in the 70s.
h m s
Pete Pfitzinger Heart Rate Zones
Using the numbers and categories in Faster Road Racing. Good book, go get it.