Measuring My Lactate Threshold with the Conconi Test...

Recently I read this article in Triathlon Magazine Canada about measuring your lactate thresh hold with the Conconi Test.  The article refers to biking but I figured it would work for running too.  Basically, you run on a treadmill at consistently increasing speeds and measure your heart rate at each speed.  Then you graph the results and apparently there is a deflection point (slight flattening) of the heart rate at your lactate threshold point, when you stop using aerobic energy and start using anaerobic energy.  (Training just below this rate helps you push it higher, which makes for faster half marathon running.)

I did two test runs two weeks apart, starting at 5 miles/hour and going up to 8.4 miles/hour, increasing by 0.2 miles per hour every minute.  Total distance run on the treadmill was 2 miles each time.  Unfortunately, I couldn't really tell what my lactate threshold was from the result, so I may repeat the test with 0.1 mile per hour increases every minute.  The most interesting result to me was how close the two lines were to each other.

Heart Rate Vs Miles/Hour