Lactate Threshold
At lower levels of exertion our bodies can easily keep up with the oxygen demands of our muscles over long periods of time.  Such a condition is called aerobic (in the presence of oxygen) and that is the range were we do most all of our training.  As intensity increases we finally reach the anaerobic level were lactate acid builds in our muscles rapidly and we can hold that pace for only a short period of time.  Anyone knows as they sprint, they can only last maybe 90 seconds.

The level of exertion where we make the transition from aerobic to anaerobic is referred to as the Anaerobic Threshold (AT) or more often as the Lactate Threshold (LT).  This is not a sharp point but a transition range.  Conditioned athletes can hold just below the LT for up to an hour.  When we are unfit out LT is 65-70 percent of MHR, or lowered.  Conditioned athletes can move have a LT as high as 90 percent of MHR.

We can get a good idea of our LT by doing a 1 hour time trial.  Another method is to gradually increase your pace over a 10 minute period until you reach the point where you legs feel like rubber and your rate of breathing suddenly increases (caused by the extra acid in your blood). 

Once you know both your MHR and your LT, you are ready to design a training program. Go to the next section on Zone Training.

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