Nordic Trac Computer

Nordic Trac Achiever

My parents had a Nordic Trac I used when I was in college, and I bought one last year to work out on.  Well, I’ve pulled it out and started using it; however, an old question has surfaced in my mind again:

What in the world is “Perf Index” on the Achiever BC-887 for?

It can’t be calories because it doesn’t know how much resistance I have.  The only connection is speed and time
It seems to count linearly so that at 12km/hr, I’ll hit 100 in 20 min covering 5km.

Oh well, any ideas out there?

By the way, the image is from a google cache of an old expired ebay auction.  One of the few I could find.

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