just another gosling
Join Date: Feb 2007
Location: Everett, WA
Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004
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Yes, AT means anaerobic threshold. Most people now say LT for lactate threshold, since your body produces more lactate as heart rate increases and the anaerobic processes begin to dominate over the aerobic.
So when someone says 88% of your AT or LT, that means heart rate. If your LT was a heart rate of 160, then 88% would be a HR of 141. Most folks train with heart rate monitors, so one sees a lot of that sort of talk.