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January 05, 2005
25:25/171
The 6.5 km tempo run planned for today turned into an attempt to prove Matt wrong. I spent only 4:37 in the "65-85%" zone.
When I went to lock in my top tempo, I was at 98-99% of my theoretical maximum heart rate, which was 186 bpm. I worked not to slow down for a little less than a mile along the Isère, picking up the pace to a sprint for the last 100-odd meters. When I looked down at the heart rate monitor at the end of the sprint it said 105%, which would be a heart rate of 195 bpm. So I guess I need to adjust the theoretical maximum on the heart rate monitor.
Matt suggests I work from my lactate threshold, rather than my theoretical maximum, because you can only really measure the maximum in the laboratory. He says a quick way to measure the lactate threshold is to warm up, then run as hard as you can sustain for a half hour, take your average pulse over that time, or perhaps over only the last 20 minutes, and that's your lactate threshold. Then your lowest normal rate would be 84% of your lactate threshold rate. Need to think about that.
Posted by Mark at January 5, 2005 01:36 PM